init

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__init__.py

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+import os
+import folder_paths
+from .nodes import ChatterboxTTSNode, ChatterboxVCNode
+from .modules.chatterbox_handler import CHATTERBOX_MODEL_SUBDIR, DEFAULT_MODEL_PACK_NAME
+
+NODE_CLASS_MAPPINGS = {
+    "ChatterboxTTS": ChatterboxTTSNode,
+    "ChatterboxVC": ChatterboxVCNode,
+}
+
+NODE_DISPLAY_NAME_MAPPINGS = {
+    "ChatterboxTTS": "Chatterbox TTS 📢",
+    "ChatterboxVC": "Chatterbox Voice Conversion 🗣️",
+}
+
+# WEB_DIRECTORY = "./js" 
+__all__ = ['NODE_CLASS_MAPPINGS', 'NODE_DISPLAY_NAME_MAPPINGS']
+
+chatterbox_models_full_path = os.path.join(folder_paths.models_dir, CHATTERBOX_MODEL_SUBDIR)
+if not os.path.exists(chatterbox_models_full_path):
+    try:
+        os.makedirs(chatterbox_models_full_path, exist_ok=True)
+        #print(f"ChatterboxTTS/VC Init: Created models directory at {chatterbox_models_full_path}")
+    except OSError as e:
+        print(f"ChatterboxTTS/VC Init: Error creating models directory {chatterbox_models_full_path}: {e}")
+
+if CHATTERBOX_MODEL_SUBDIR not in folder_paths.folder_names_and_paths:
+    folder_paths.folder_names_and_paths[CHATTERBOX_MODEL_SUBDIR] = (
+        [chatterbox_models_full_path],
+        folder_paths.supported_pt_extensions
+    )
+    #print(f"ChatterboxTTS/VC Init: Registered '{CHATTERBOX_MODEL_SUBDIR}' with ComfyUI model paths: {chatterbox_models_full_path}")
+else:
+    if chatterbox_models_full_path not in folder_paths.folder_names_and_paths[CHATTERBOX_MODEL_SUBDIR][0]:
+        folder_paths.folder_names_and_paths[CHATTERBOX_MODEL_SUBDIR][0].append(chatterbox_models_full_path)
+        #print(f"ChatterboxTTS/VC Init: Appended path for '{CHATTERBOX_MODEL_SUBDIR}': {chatterbox_models_full_path}")
+

modules/chatterbox_handler.py

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+import os
+import sys
+import torch
+import random
+import numpy as np
+import folder_paths
+import hashlib
+from huggingface_hub import hf_hub_download
+
+current_script_path = os.path.dirname(os.path.abspath(__file__))
+chatterbox_src_path = os.path.abspath(os.path.join(current_script_path, '..', 'src'))
+if chatterbox_src_path not in sys.path:
+    sys.path.insert(0, chatterbox_src_path)
+
+
+from chatterbox.tts import ChatterboxTTS
+from chatterbox.vc import ChatterboxVC # <--- Added VC import
+
+TTS_MODEL_CACHE = {}
+VC_MODEL_CACHE = {}
+CHATTERBOX_MODEL_SUBDIR = "chatterbox_tts"
+CHATTERBOX_REPO_ID = "ResembleAI/chatterbox"
+
+CHATTERBOX_FILES_TO_DOWNLOAD = ["ve.pt", "t3_cfg.pt", "s3gen.pt", "tokenizer.json", "conds.pt"]
+DEFAULT_MODEL_PACK_NAME = "resembleai_default_voice"
+
+def get_chatterbox_model_pack_names():
+    """Returns a list of available Chatterbox model pack names (subdirectories)."""
+    chatterbox_models_base_path = os.path.join(folder_paths.models_dir, CHATTERBOX_MODEL_SUBDIR)
+    if not os.path.isdir(chatterbox_models_base_path):
+        os.makedirs(chatterbox_models_base_path, exist_ok=True)
+        #print(f"ChatterboxTTS/VC: Created models directory at {chatterbox_models_base_path}")
+        return []
+    
+    packs = [d for d in os.listdir(chatterbox_models_base_path) if os.path.isdir(os.path.join(chatterbox_models_base_path, d))]
+    if not packs:
+        return []
+    return packs
+
+def get_model_pack_path(model_pack_name):
+    """Gets the full path to a specific model pack."""
+    if not model_pack_name:
+        return None
+    return os.path.join(folder_paths.models_dir, CHATTERBOX_MODEL_SUBDIR, model_pack_name)
+
+def _download_file_from_hf(repo_id, filename, local_dir, local_filename=None):
+    if local_filename is None:
+        local_filename = filename
+    destination = os.path.join(local_dir, local_filename)
+    
+    if not os.path.exists(destination):
+        print(f"ChatterboxTTS/VC: Downloading '{filename}' from '{repo_id}' to '{destination}'...")
+        try:
+            hf_hub_download(
+                repo_id=repo_id,
+                filename=filename,
+                local_dir=local_dir,
+            )
+            if filename != local_filename and os.path.exists(os.path.join(local_dir, filename)) and not os.path.exists(destination):
+                 os.rename(os.path.join(local_dir, filename), destination)
+            print(f"ChatterboxTTS/VC: Successfully downloaded '{local_filename}'.")
+            return True
+        except Exception as e:
+            print(f"ChatterboxTTS/VC: Failed to download '{filename}' from '{repo_id}'. Error: {e}")
+            if os.path.exists(destination + ".incomplete"):
+                os.remove(destination + ".incomplete")
+            return False
+    else:
+        return True
+
+def download_chatterbox_model_pack_if_missing(model_pack_name):
+    """Downloads all necessary model files for a given pack name if they don't exist."""
+    ckpt_dir = get_model_pack_path(model_pack_name)
+    if not ckpt_dir:
+        print(f"ChatterboxTTS/VC: Invalid model pack name '{model_pack_name}', cannot download.")
+        return False
+        
+    os.makedirs(ckpt_dir, exist_ok=True)
+    
+    all_files_successfully_managed = True
+
+    vc_required_files = ["s3gen.pt", "conds.pt"]
+
+    files_to_check = CHATTERBOX_FILES_TO_DOWNLOAD
+    
+    for file_name in files_to_check:
+        if not _download_file_from_hf(CHATTERBOX_REPO_ID, file_name, ckpt_dir):
+            all_files_successfully_managed = False
+            if file_name in vc_required_files:
+                print(f"ChatterboxTTS/VC: Critical file '{file_name}' for VC failed to download for pack '{model_pack_name}'.")
+            # return False
+
+    if all_files_successfully_managed:
+        pass #print(f"ChatterboxTTS/VC: Verified/Downloaded all files for model pack '{model_pack_name}' into '{ckpt_dir}'.")
+    else:
+        print(f"ChatterboxTTS/VC: Some files failed to download for model pack '{model_pack_name}'. Check logs.")
+    return all_files_successfully_managed
+
+
+def load_chatterbox_tts_model(model_pack_name, device_str="cuda"):
+    ckpt_dir = get_model_pack_path(model_pack_name)
+    if not ckpt_dir:
+        raise ValueError(f"ChatterboxTTS: Invalid model_pack_name: {model_pack_name}")
+    #print(f"ChatterboxTTS: Attempting to load TTS model pack '{model_pack_name}' from '{ckpt_dir}'.")
+    if not download_chatterbox_model_pack_if_missing(model_pack_name):
+        print(f"ChatterboxTTS: Warning - Not all TTS model files could be verified/downloaded for '{model_pack_name}'. Loading may fail.")
+    if not os.path.isdir(ckpt_dir):
+         raise FileNotFoundError(f"ChatterboxTTS: Model pack directory '{model_pack_name}' not found and could not be created at '{ckpt_dir}'.")
+    #print(f"ChatterboxTTS: Loading ChatterboxTTS model from local directory: {ckpt_dir} onto device: {device_str}")
+    try:
+        model = ChatterboxTTS.from_local(ckpt_dir, device=device_str)
+    except Exception as e:
+        print(f"ChatterboxTTS: Error during ChatterboxTTS.from_local('{ckpt_dir}', device='{device_str}'): {e}")
+        print(f"ChatterboxTTS: Please ensure all required model files ({', '.join(CHATTERBOX_FILES_TO_DOWNLOAD)}) are present in {ckpt_dir} or can be downloaded from {CHATTERBOX_REPO_ID}.")
+        raise
+    return model
+
+def get_cached_chatterbox_tts_model(model_pack_name, device_str="cuda"):
+    """Loads and caches the ChatterboxTTS model."""
+    if not model_pack_name:
+        available_packs = get_chatterbox_model_pack_names()
+        model_pack_name = available_packs[0] if available_packs else DEFAULT_MODEL_PACK_NAME
+        print(f"ChatterboxTTS: No model pack specified for TTS, using '{model_pack_name}'.")
+
+    cache_key = (model_pack_name, device_str, "tts")
+    current_model = TTS_MODEL_CACHE.get(cache_key)
+    model_device_correct = False
+    if current_model is not None and hasattr(current_model, 'device'):
+        try:
+            if str(current_model.device) == device_str:
+                model_device_correct = True
+        except Exception as e:
+            print(f"ChatterboxTTS: Error checking cached TTS model device: {e}. Will reload.")
+
+    if current_model is not None and model_device_correct:
+        return current_model
+    else:
+        if current_model is not None and not model_device_correct:
+            print(f"ChatterboxTTS: Device mismatch for cached TTS model '{model_pack_name}'. Reloading.")
+        else:
+            print(f"ChatterboxTTS: TTS Model for '{model_pack_name}' on '{device_str}' not in cache. Loading...")
+        
+        TTS_MODEL_CACHE[cache_key] = load_chatterbox_tts_model(model_pack_name, device_str)
+        return TTS_MODEL_CACHE[cache_key]
+
+
+def load_chatterbox_vc_model(model_pack_name, device_str="cuda"):
+    """Loads the ChatterboxVC model from a specified pack."""
+    ckpt_dir = get_model_pack_path(model_pack_name)
+    if not ckpt_dir:
+        raise ValueError(f"ChatterboxVC: Invalid model_pack_name: {model_pack_name}")
+
+    #print(f"ChatterboxVC: Attempting to load VC model pack '{model_pack_name}' from '{ckpt_dir}'.")
+
+    if not download_chatterbox_model_pack_if_missing(model_pack_name):
+        vc_min_files = ["s3gen.pt", "conds.pt"]
+        for f_name in vc_min_files:
+            if not os.path.exists(os.path.join(ckpt_dir, f_name)):
+                 print(f"ChatterboxVC: Critical file '{f_name}' for VC is missing from pack '{model_pack_name}' after download attempt. Loading will likely fail.")
+                 break 
+        else:
+             print(f"ChatterboxVC: Warning - Not all model files could be verified/downloaded for '{model_pack_name}', but attempting to load VC with available files.")
+
+
+    if not os.path.isdir(ckpt_dir):
+         raise FileNotFoundError(f"ChatterboxVC: Model pack directory '{model_pack_name}' not found and could not be created at '{ckpt_dir}'.")
+    
+    # print(f"ChatterboxVC: Loading ChatterboxVC model from local directory: {ckpt_dir} onto device: {device_str}")
+    try:
+        model = ChatterboxVC.from_local(ckpt_dir, device=device_str)
+    except Exception as e:
+        print(f"ChatterboxVC: Error during ChatterboxVC.from_local('{ckpt_dir}', device='{device_str}'): {e}")
+        print(f"ChatterboxVC: Please ensure at least 's3gen.pt' and optionally 'conds.pt' (for default voice) are present in {ckpt_dir} or can be downloaded from {CHATTERBOX_REPO_ID}.")
+        raise
+    return model
+
+def get_cached_chatterbox_vc_model(model_pack_name, device_str="cuda"):
+    """Loads and caches the ChatterboxVC model."""
+    if not model_pack_name:
+        available_packs = get_chatterbox_model_pack_names()
+        model_pack_name = available_packs[0] if available_packs else DEFAULT_MODEL_PACK_NAME
+        print(f"ChatterboxVC: No model pack specified for VC, using '{model_pack_name}'.")
+
+    cache_key = (model_pack_name, device_str, "vc")
+    current_model = VC_MODEL_CACHE.get(cache_key)
+    model_device_correct = False
+    if current_model is not None and hasattr(current_model, 'device'):
+        try:
+            if str(current_model.device) == device_str:
+                model_device_correct = True
+        except Exception as e:
+            print(f"ChatterboxVC: Error checking cached VC model device: {e}. Will reload.")
+
+    if current_model is not None and model_device_correct:
+        return current_model
+    else:
+        if current_model is not None and not model_device_correct:
+            print(f"ChatterboxVC: Device mismatch for cached VC model '{model_pack_name}'. Reloading.")
+        else:
+            print(f"ChatterboxVC: VC Model for '{model_pack_name}' on '{device_str}' not in cache. Loading...")
+        VC_MODEL_CACHE[cache_key] = load_chatterbox_vc_model(model_pack_name, device_str)
+        return VC_MODEL_CACHE[cache_key]
+
+
+def set_chatterbox_seed(seed: int):
+    """Sets the seed for Chatterbox TTS/VC."""
+    MAX_NUMPY_SEED = 2**32 - 1
+    if seed == 0: 
+        actual_seed_for_torch_random = random.randint(1, 0xffffffffffffffff)
+        actual_seed_for_numpy = random.randint(1, MAX_NUMPY_SEED)
+    else:
+        actual_seed_for_torch_random = seed
+        # fast fix range for seed, sorry 
+        actual_seed_for_numpy = seed % MAX_NUMPY_SEED
+    
+    torch.manual_seed(actual_seed_for_torch_random)
+    if torch.cuda.is_available():
+        torch.cuda.manual_seed(actual_seed_for_torch_random)
+        torch.cuda.manual_seed_all(actual_seed_for_torch_random)
+    random.seed(actual_seed_for_torch_random)
+    np.random.seed(actual_seed_for_numpy)
+    

nodes.py

@@ -0,0 +1,231 @@
+import os
+import torch
+import folder_paths
+import tempfile
+import soundfile as sf
+import numpy as np
+
+from .modules.chatterbox_handler import (
+    get_chatterbox_model_pack_names,
+    get_cached_chatterbox_tts_model,
+    get_cached_chatterbox_vc_model,
+    set_chatterbox_seed,
+    CHATTERBOX_MODEL_SUBDIR,
+    DEFAULT_MODEL_PACK_NAME
+)
+
+class ChatterboxTTSNode:
+    @classmethod
+    def INPUT_TYPES(cls):
+        available_model_packs = get_chatterbox_model_pack_names()
+        displayed_packs = [DEFAULT_MODEL_PACK_NAME] + [p for p in available_model_packs if p != DEFAULT_MODEL_PACK_NAME]
+        if not displayed_packs:
+            displayed_packs = [DEFAULT_MODEL_PACK_NAME]
+
+        return {
+            "required": {
+                "model_pack_name": (displayed_packs, {"default": DEFAULT_MODEL_PACK_NAME if DEFAULT_MODEL_PACK_NAME in displayed_packs else (displayed_packs[0] if displayed_packs else DEFAULT_MODEL_PACK_NAME)}),
+                "text": ("STRING", {"multiline": True, "default": "Hello, this is a test of Chatterbox TTS in ComfyUI."}),
+                "exaggeration": ("FLOAT", {"default": 0.5, "min": 0.25, "max": 2.0, "step": 0.05}),
+                "temperature": ("FLOAT", {"default": 0.8, "min": 0.05, "max": 5.0, "step": 0.05}),
+                "cfg_weight": ("FLOAT", {"default": 0.5, "min": 0.2, "max": 1.0, "step": 0.05}),
+                "seed": ("INT", {"default": 0, "min": 0, "max": 0xffffffffffffffff, "control_after_generate": True}),
+                "device": (["cuda", "cpu"], {"default": "cuda" if torch.cuda.is_available() else "cpu"}),
+            },
+            "optional": {
+                "audio_prompt": ("AUDIO",),
+            }
+        }
+
+    RETURN_TYPES = ("AUDIO",)
+    RETURN_NAMES = ("audio",)
+    FUNCTION = "synthesize"
+    CATEGORY = "audio/generation"
+    OUTPUT_NODE = True 
+
+    def synthesize(self, model_pack_name, text, exaggeration, temperature, cfg_weight, seed, device, audio_prompt=None):
+        if not text.strip():
+            #print("Chatterbox TTS: Empty text provided, returning silent audio.")
+            dummy_sr = 24000 
+            silent_waveform = torch.zeros((1, dummy_sr), dtype=torch.float32, device="cpu")
+            return ({"waveform": silent_waveform.unsqueeze(0), "sample_rate": dummy_sr},)
+
+        try:
+            chatterbox_model = get_cached_chatterbox_tts_model(model_pack_name, device_str=device)
+        except Exception as e:
+            print(f"ChatterboxTTS: Error loading/downloading TTS model pack '{model_pack_name}': {e}")
+            dummy_sr = 24000
+            silent_waveform = torch.zeros((1, dummy_sr), dtype=torch.float32, device="cpu")
+            return ({"waveform": silent_waveform.unsqueeze(0), "sample_rate": dummy_sr},)
+
+        set_chatterbox_seed(seed)
+        
+        audio_prompt_path_temp = None
+        if audio_prompt is not None and \
+           audio_prompt.get("waveform") is not None and \
+           audio_prompt["waveform"].numel() > 0:
+            
+            waveform_in = audio_prompt["waveform"] 
+            sample_rate_in = audio_prompt["sample_rate"]
+            waveform_cpu = waveform_in.cpu()
+            if waveform_cpu.shape[0] > 1:
+                print(f"ChatterboxTTS: Audio prompt has batch size {waveform_cpu.shape[0]}, using first item.")
+            current_waveform = waveform_cpu[0] 
+            if current_waveform.shape[0] > 1: 
+                current_waveform = torch.mean(current_waveform, dim=0)
+            else: 
+                current_waveform = current_waveform.squeeze(0)
+            
+            processed_audio_prompt = current_waveform.numpy().astype(np.float32)
+            try:
+                with tempfile.NamedTemporaryFile(suffix=".wav", delete=False) as tmp_wav:
+                    audio_prompt_path_temp = tmp_wav.name
+                sf.write(audio_prompt_path_temp, processed_audio_prompt, sample_rate_in)
+                #print(f"ChatterboxTTS: Using audio prompt from temp file: {audio_prompt_path_temp}")
+            except Exception as e:
+                print(f"ChatterboxTTS: Error writing temp audio prompt file: {e}")
+                audio_prompt_path_temp = None
+
+        try:
+            wav_tensor_chatterbox = chatterbox_model.generate(
+                text,
+                audio_prompt_path=audio_prompt_path_temp,
+                exaggeration=exaggeration,
+                temperature=temperature,
+                cfg_weight=cfg_weight
+            ) 
+        except Exception as e:
+            print(f"ChatterboxTTS: Error during TTS generation: {e}")
+            dummy_sr = 24000
+            silent_waveform = torch.zeros((1, dummy_sr), dtype=torch.float32, device="cpu")
+            return ({"waveform": silent_waveform.unsqueeze(0), "sample_rate": dummy_sr},)
+        finally:
+            if audio_prompt_path_temp and os.path.exists(audio_prompt_path_temp):
+                try:
+                    os.remove(audio_prompt_path_temp)
+                except Exception as e:
+                    print(f"ChatterboxTTS: Error removing temp audio prompt file {audio_prompt_path_temp}: {e}")
+        
+        wav_tensor_comfy = wav_tensor_chatterbox.cpu().unsqueeze(0) 
+        return ({"waveform": wav_tensor_comfy, "sample_rate": chatterbox_model.sr},)
+
+
+class ChatterboxVCNode:
+    @classmethod
+    def INPUT_TYPES(cls):
+        available_model_packs = get_chatterbox_model_pack_names()
+        displayed_packs = [DEFAULT_MODEL_PACK_NAME] + [p for p in available_model_packs if p != DEFAULT_MODEL_PACK_NAME]
+        if not displayed_packs:
+            displayed_packs = [DEFAULT_MODEL_PACK_NAME]
+
+        return {
+            "required": {
+                "model_pack_name": (displayed_packs, {"default": DEFAULT_MODEL_PACK_NAME if DEFAULT_MODEL_PACK_NAME in displayed_packs else (displayed_packs[0] if displayed_packs else DEFAULT_MODEL_PACK_NAME)}),
+                "source_audio": ("AUDIO",),
+                "device": (["cuda", "cpu"], {"default": "cuda" if torch.cuda.is_available() else "cpu"}),
+            },
+            "optional": {
+                "target_voice_audio": ("AUDIO",), # Optional: if not provided, uses default voice from conds.pt
+            }
+        }
+
+    RETURN_TYPES = ("AUDIO",)
+    RETURN_NAMES = ("converted_audio",)
+    FUNCTION = "convert_voice"
+    CATEGORY = "audio/generation"
+    OUTPUT_NODE = True
+
+    def _save_audio_to_temp_file(self, audio_data, prefix=""):
+        """Helper to save ComfyUI AUDIO dict to a temporary WAV file."""
+        if audio_data is None or \
+           audio_data.get("waveform") is None or \
+           audio_data["waveform"].numel() == 0:
+            return None
+
+        waveform_in = audio_data["waveform"]
+        sample_rate_in = audio_data["sample_rate"]
+        waveform_cpu = waveform_in.cpu()
+
+        if waveform_cpu.shape[0] > 1:
+            print(f"ChatterboxVC: {prefix}Audio has batch size {waveform_cpu.shape[0]}, using first item.")
+        current_waveform = waveform_cpu[0]
+
+        if current_waveform.shape[0] > 1: # If C > 1 (stereo or more)
+            print(f"ChatterboxVC: {prefix}Audio has {current_waveform.shape[0]} channels, converting to mono by averaging.")
+            current_waveform = torch.mean(current_waveform, dim=0)
+        else: # If C == 1
+            current_waveform = current_waveform.squeeze(0)
+        
+        processed_audio = current_waveform.numpy().astype(np.float32)
+        
+        temp_file_path = None
+        try:
+            with tempfile.NamedTemporaryFile(suffix=".wav", delete=False) as tmp_wav:
+                temp_file_path = tmp_wav.name
+            sf.write(temp_file_path, processed_audio, sample_rate_in)
+            #print(f"ChatterboxVC: Saved {prefix}audio to temp file: {temp_file_path}")
+            return temp_file_path
+        except Exception as e:
+            print(f"ChatterboxVC: Error writing temp {prefix}audio file: {e}")
+            if temp_file_path and os.path.exists(temp_file_path):
+                os.remove(temp_file_path)
+            return None
+
+    def convert_voice(self, model_pack_name, source_audio, device, target_voice_audio=None):
+        if source_audio is None or source_audio.get("waveform") is None or source_audio["waveform"].numel() == 0:
+            print("ChatterboxVC: No source audio provided, returning silent audio.")
+            dummy_sr = 24000
+            silent_waveform = torch.zeros((1, dummy_sr), dtype=torch.float32, device="cpu")
+            return ({"waveform": silent_waveform.unsqueeze(0), "sample_rate": dummy_sr},)
+
+        try:
+            vc_model = get_cached_chatterbox_vc_model(model_pack_name, device_str=device)
+        except Exception as e:
+            print(f"ChatterboxVC: Error loading/downloading VC model pack '{model_pack_name}': {e}")
+            dummy_sr = 24000
+            silent_waveform = torch.zeros((1, dummy_sr), dtype=torch.float32, device="cpu")
+            return ({"waveform": silent_waveform.unsqueeze(0), "sample_rate": dummy_sr},)
+
+        source_audio_path_temp = None
+        target_voice_path_temp = None
+
+        try:
+            source_audio_path_temp = self._save_audio_to_temp_file(source_audio, prefix="Source ")
+            if not source_audio_path_temp:
+                raise ValueError("Failed to process source audio.")
+
+            if target_voice_audio is not None and \
+               target_voice_audio.get("waveform") is not None and \
+               target_voice_audio["waveform"].numel() > 0:
+                target_voice_path_temp = self._save_audio_to_temp_file(target_voice_audio, prefix="Target ")
+                #print(f"ChatterboxVC: Using target voice from temp file: {target_voice_path_temp}")
+            else:
+                print("ChatterboxVC: No target voice audio provided or it's empty. Using default reference from model pack if available.")
+            
+            # ChatterboxVC.generate expects file paths
+            converted_wav_tensor = vc_model.generate(
+                audio=source_audio_path_temp,
+                target_voice_path=target_voice_path_temp # This will be None if no target_voice_audio was provided or saving it failed
+            ) # Expected output: (1, num_samples)
+
+        except Exception as e:
+            print(f"ChatterboxVC: Error during voice conversion: {e}")
+            dummy_sr = 24000
+            silent_waveform = torch.zeros((1, dummy_sr), dtype=torch.float32, device="cpu")
+            return ({"waveform": silent_waveform.unsqueeze(0), "sample_rate": dummy_sr},)
+        finally:
+            if source_audio_path_temp and os.path.exists(source_audio_path_temp):
+                try:
+                    os.remove(source_audio_path_temp)
+                except Exception as e:
+                    print(f"ChatterboxVC: Error removing temp source audio file {source_audio_path_temp}: {e}")
+            if target_voice_path_temp and os.path.exists(target_voice_path_temp):
+                try:
+                    os.remove(target_voice_path_temp)
+                except Exception as e:
+                    print(f"ChatterboxVC: Error removing temp target audio file {target_voice_path_temp}: {e}")
+        
+        # ComfyUI AUDIO format: {"waveform": tensor (B, C, T), "sample_rate": int}
+        # ChatterboxVC output: tensor (1, T)
+        vc_wav_tensor_comfy = converted_wav_tensor.cpu().unsqueeze(0) # (1, T) -> (1, 1, T)
+        return ({"waveform": vc_wav_tensor_comfy, "sample_rate": vc_model.sr},)

requirements.txt

@@ -0,0 +1,12 @@
+torch
+torchaudio
+librosa
+numpy
+huggingface_hub
+resemble-perth
+einops
+scipy
+tokenizers
+soundfile
+s3tokenizer
+conformer

src/chatterbox/__init__.py

@@ -0,0 +1,2 @@
+from .tts import ChatterboxTTS
+from .vc import ChatterboxVC

src/chatterbox/models/s3gen/__init__.py

@@ -0,0 +1,2 @@
+from .s3gen import S3Token2Wav as S3Gen
+from .const import S3GEN_SR

src/chatterbox/models/s3gen/const.py

@@ -0,0 +1 @@
+S3GEN_SR = 24000

src/chatterbox/models/s3gen/decoder.py

@@ -0,0 +1,317 @@
+# Copyright (c) 2024 Alibaba Inc (authors: Xiang Lyu, Zhihao Du)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+from einops import pack, rearrange, repeat
+
+from .utils.mask import add_optional_chunk_mask
+from .matcha.decoder import SinusoidalPosEmb, Block1D, ResnetBlock1D, Downsample1D, \
+    TimestepEmbedding, Upsample1D
+from .matcha.transformer import BasicTransformerBlock
+
+
+def mask_to_bias(mask: torch.Tensor, dtype: torch.dtype) -> torch.Tensor:
+    assert mask.dtype == torch.bool
+    assert dtype in [torch.float32, torch.bfloat16, torch.float16]
+    mask = mask.to(dtype)
+    # attention mask bias
+    # NOTE(Mddct): torch.finfo jit issues
+    #     chunk_masks = (1.0 - chunk_masks) * torch.finfo(dtype).min
+    mask = (1.0 - mask) * -1.0e+10
+    return mask
+
+
+
+class Transpose(torch.nn.Module):
+    def __init__(self, dim0: int, dim1: int):
+        super().__init__()
+        self.dim0 = dim0
+        self.dim1 = dim1
+
+    def forward(self, x: torch.Tensor):
+        x = torch.transpose(x, self.dim0, self.dim1)
+        return x
+
+
+class CausalBlock1D(Block1D):
+    def __init__(self, dim: int, dim_out: int):
+        super(CausalBlock1D, self).__init__(dim, dim_out)
+        self.block = torch.nn.Sequential(
+            CausalConv1d(dim, dim_out, 3),
+            Transpose(1, 2),
+            nn.LayerNorm(dim_out),
+            Transpose(1, 2),
+            nn.Mish(),
+        )
+
+    def forward(self, x: torch.Tensor, mask: torch.Tensor):
+        output = self.block(x * mask)
+        return output * mask
+
+
+class CausalResnetBlock1D(ResnetBlock1D):
+    def __init__(self, dim: int, dim_out: int, time_emb_dim: int, groups: int = 8):
+        super(CausalResnetBlock1D, self).__init__(dim, dim_out, time_emb_dim, groups)
+        self.block1 = CausalBlock1D(dim, dim_out)
+        self.block2 = CausalBlock1D(dim_out, dim_out)
+
+
+class CausalConv1d(torch.nn.Conv1d):
+    def __init__(
+        self,
+        in_channels: int,
+        out_channels: int,
+        kernel_size: int,
+        stride: int = 1,
+        dilation: int = 1,
+        groups: int = 1,
+        bias: bool = True,
+        padding_mode: str = 'zeros',
+        device=None,
+        dtype=None
+    ) -> None:
+        super(CausalConv1d, self).__init__(in_channels, out_channels,
+                                           kernel_size, stride,
+                                           padding=0, dilation=dilation,
+                                           groups=groups, bias=bias,
+                                           padding_mode=padding_mode,
+                                           device=device, dtype=dtype)
+        assert stride == 1
+        self.causal_padding = (kernel_size - 1, 0)
+
+    def forward(self, x: torch.Tensor):
+        x = F.pad(x, self.causal_padding)
+        x = super(CausalConv1d, self).forward(x)
+        return x
+
+
+class ConditionalDecoder(nn.Module):
+    def __init__(
+        self,
+        in_channels=320,
+        out_channels=80,
+        causal=True,
+        channels=[256],
+        dropout=0.0,
+        attention_head_dim=64,
+        n_blocks=4,
+        num_mid_blocks=12,
+        num_heads=8,
+        act_fn="gelu",
+    ):
+        """
+        This decoder requires an input with the same shape of the target. So, if your text content
+        is shorter or longer than the outputs, please re-sampling it before feeding to the decoder.
+        """
+        super().__init__()
+        channels = tuple(channels)
+        self.in_channels = in_channels
+        self.out_channels = out_channels
+        self.causal = causal
+        self.time_embeddings = SinusoidalPosEmb(in_channels)
+        time_embed_dim = channels[0] * 4
+        self.time_mlp = TimestepEmbedding(
+            in_channels=in_channels,
+            time_embed_dim=time_embed_dim,
+            act_fn="silu",
+        )
+        self.down_blocks = nn.ModuleList([])
+        self.mid_blocks = nn.ModuleList([])
+        self.up_blocks = nn.ModuleList([])
+
+        # NOTE jrm: `static_chunk_size` is missing?
+        self.static_chunk_size = 0
+
+        output_channel = in_channels
+        for i in range(len(channels)):  # pylint: disable=consider-using-enumerate
+            input_channel = output_channel
+            output_channel = channels[i]
+            is_last = i == len(channels) - 1
+            resnet = CausalResnetBlock1D(dim=input_channel, dim_out=output_channel, time_emb_dim=time_embed_dim) if self.causal else \
+                ResnetBlock1D(dim=input_channel, dim_out=output_channel, time_emb_dim=time_embed_dim)
+            transformer_blocks = nn.ModuleList(
+                [
+                    BasicTransformerBlock(
+                        dim=output_channel,
+                        num_attention_heads=num_heads,
+                        attention_head_dim=attention_head_dim,
+                        dropout=dropout,
+                        activation_fn=act_fn,
+                    )
+                    for _ in range(n_blocks)
+                ]
+            )
+            downsample = (
+                Downsample1D(output_channel) if not is_last else
+                CausalConv1d(output_channel, output_channel, 3) if self.causal else nn.Conv1d(output_channel, output_channel, 3, padding=1)
+            )
+            self.down_blocks.append(nn.ModuleList([resnet, transformer_blocks, downsample]))
+
+        for _ in range(num_mid_blocks):
+            input_channel = channels[-1]
+            out_channels = channels[-1]
+            resnet = CausalResnetBlock1D(dim=input_channel, dim_out=output_channel, time_emb_dim=time_embed_dim) if self.causal else \
+                ResnetBlock1D(dim=input_channel, dim_out=output_channel, time_emb_dim=time_embed_dim)
+
+            transformer_blocks = nn.ModuleList(
+                [
+                    BasicTransformerBlock(
+                        dim=output_channel,
+                        num_attention_heads=num_heads,
+                        attention_head_dim=attention_head_dim,
+                        dropout=dropout,
+                        activation_fn=act_fn,
+                    )
+                    for _ in range(n_blocks)
+                ]
+            )
+
+            self.mid_blocks.append(nn.ModuleList([resnet, transformer_blocks]))
+
+        channels = channels[::-1] + (channels[0],)
+        for i in range(len(channels) - 1):
+            input_channel = channels[i] * 2
+            output_channel = channels[i + 1]
+            is_last = i == len(channels) - 2
+            resnet = CausalResnetBlock1D(
+                dim=input_channel,
+                dim_out=output_channel,
+                time_emb_dim=time_embed_dim,
+            ) if self.causal else ResnetBlock1D(
+                dim=input_channel,
+                dim_out=output_channel,
+                time_emb_dim=time_embed_dim,
+            )
+            transformer_blocks = nn.ModuleList(
+                [
+                    BasicTransformerBlock(
+                        dim=output_channel,
+                        num_attention_heads=num_heads,
+                        attention_head_dim=attention_head_dim,
+                        dropout=dropout,
+                        activation_fn=act_fn,
+                    )
+                    for _ in range(n_blocks)
+                ]
+            )
+            upsample = (
+                Upsample1D(output_channel, use_conv_transpose=True)
+                if not is_last
+                else CausalConv1d(output_channel, output_channel, 3) if self.causal else nn.Conv1d(output_channel, output_channel, 3, padding=1)
+            )
+            self.up_blocks.append(nn.ModuleList([resnet, transformer_blocks, upsample]))
+        self.final_block = CausalBlock1D(channels[-1], channels[-1]) if self.causal else Block1D(channels[-1], channels[-1])
+        self.final_proj = nn.Conv1d(channels[-1], self.out_channels, 1)
+        self.initialize_weights()
+
+    def initialize_weights(self):
+        for m in self.modules():
+            if isinstance(m, nn.Conv1d):
+                nn.init.kaiming_normal_(m.weight, nonlinearity="relu")
+                if m.bias is not None:
+                    nn.init.constant_(m.bias, 0)
+            elif isinstance(m, nn.GroupNorm):
+                nn.init.constant_(m.weight, 1)
+                nn.init.constant_(m.bias, 0)
+            elif isinstance(m, nn.Linear):
+                nn.init.kaiming_normal_(m.weight, nonlinearity="relu")
+                if m.bias is not None:
+                    nn.init.constant_(m.bias, 0)
+
+    def forward(self, x, mask, mu, t, spks=None, cond=None):
+        """Forward pass of the UNet1DConditional model.
+
+        Args:
+            x (torch.Tensor): shape (batch_size, in_channels, time)
+            mask (_type_): shape (batch_size, 1, time)
+            t (_type_): shape (batch_size)
+            spks (_type_, optional): shape: (batch_size, condition_channels). Defaults to None.
+            cond (_type_, optional): placeholder for future use. Defaults to None.
+
+        Raises:
+            ValueError: _description_
+            ValueError: _description_
+
+        Returns:
+            _type_: _description_
+        """
+
+        t = self.time_embeddings(t).to(t.dtype)
+        t = self.time_mlp(t)
+
+        x = pack([x, mu], "b * t")[0]
+
+        if spks is not None:
+            spks = repeat(spks, "b c -> b c t", t=x.shape[-1])
+            x = pack([x, spks], "b * t")[0]
+        if cond is not None:
+            x = pack([x, cond], "b * t")[0]
+
+        hiddens = []
+        masks = [mask]
+        for resnet, transformer_blocks, downsample in self.down_blocks:
+            mask_down = masks[-1]
+            x = resnet(x, mask_down, t)
+            x = rearrange(x, "b c t -> b t c").contiguous()
+            # attn_mask = torch.matmul(mask_down.transpose(1, 2).contiguous(), mask_down)
+            attn_mask = add_optional_chunk_mask(x, mask_down.bool(), False, False, 0, self.static_chunk_size, -1)
+            attn_mask = mask_to_bias(attn_mask == 1, x.dtype)
+            for transformer_block in transformer_blocks:
+                x = transformer_block(
+                    hidden_states=x,
+                    attention_mask=attn_mask,
+                    timestep=t,
+                )
+            x = rearrange(x, "b t c -> b c t").contiguous()
+            hiddens.append(x)  # Save hidden states for skip connections
+            x = downsample(x * mask_down)
+            masks.append(mask_down[:, :, ::2])
+        masks = masks[:-1]
+        mask_mid = masks[-1]
+
+        for resnet, transformer_blocks in self.mid_blocks:
+            x = resnet(x, mask_mid, t)
+            x = rearrange(x, "b c t -> b t c").contiguous()
+            # attn_mask = torch.matmul(mask_mid.transpose(1, 2).contiguous(), mask_mid)
+            attn_mask = add_optional_chunk_mask(x, mask_mid.bool(), False, False, 0, self.static_chunk_size, -1)
+            attn_mask = mask_to_bias(attn_mask == 1, x.dtype)
+            for transformer_block in transformer_blocks:
+                x = transformer_block(
+                    hidden_states=x,
+                    attention_mask=attn_mask,
+                    timestep=t,
+                )
+            x = rearrange(x, "b t c -> b c t").contiguous()
+
+        for resnet, transformer_blocks, upsample in self.up_blocks:
+            mask_up = masks.pop()
+            skip = hiddens.pop()
+            x = pack([x[:, :, :skip.shape[-1]], skip], "b * t")[0]
+            x = resnet(x, mask_up, t)
+            x = rearrange(x, "b c t -> b t c").contiguous()
+            # attn_mask = torch.matmul(mask_up.transpose(1, 2).contiguous(), mask_up)
+            attn_mask = add_optional_chunk_mask(x, mask_up.bool(), False, False, 0, self.static_chunk_size, -1)
+            attn_mask = mask_to_bias(attn_mask == 1, x.dtype)
+            for transformer_block in transformer_blocks:
+                x = transformer_block(
+                    hidden_states=x,
+                    attention_mask=attn_mask,
+                    timestep=t,
+                )
+            x = rearrange(x, "b t c -> b c t").contiguous()
+            x = upsample(x * mask_up)
+        x = self.final_block(x, mask_up)
+        output = self.final_proj(x * mask_up)
+        return output * mask

src/chatterbox/models/s3gen/f0_predictor.py

@@ -0,0 +1,55 @@
+# Copyright (c) 2024 Alibaba Inc (authors: Xiang Lyu, Kai Hu)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import torch
+import torch.nn as nn
+from torch.nn.utils.parametrizations import weight_norm
+
+
+class ConvRNNF0Predictor(nn.Module):
+    def __init__(self,
+                 num_class: int = 1,
+                 in_channels: int = 80,
+                 cond_channels: int = 512
+                 ):
+        super().__init__()
+
+        self.num_class = num_class
+        self.condnet = nn.Sequential(
+            weight_norm(
+                nn.Conv1d(in_channels, cond_channels, kernel_size=3, padding=1)
+            ),
+            nn.ELU(),
+            weight_norm(
+                nn.Conv1d(cond_channels, cond_channels, kernel_size=3, padding=1)
+            ),
+            nn.ELU(),
+            weight_norm(
+                nn.Conv1d(cond_channels, cond_channels, kernel_size=3, padding=1)
+            ),
+            nn.ELU(),
+            weight_norm(
+                nn.Conv1d(cond_channels, cond_channels, kernel_size=3, padding=1)
+            ),
+            nn.ELU(),
+            weight_norm(
+                nn.Conv1d(cond_channels, cond_channels, kernel_size=3, padding=1)
+            ),
+            nn.ELU(),
+        )
+        self.classifier = nn.Linear(in_features=cond_channels, out_features=self.num_class)
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        x = self.condnet(x)
+        x = x.transpose(1, 2)
+        return torch.abs(self.classifier(x).squeeze(-1))

src/chatterbox/models/s3gen/flow.py

@@ -0,0 +1,242 @@
+# Copyright (c) 2024 Alibaba Inc (authors: Xiang Lyu, Zhihao Du)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import logging
+import random
+from typing import Dict, Optional
+import torch
+import torch.nn as nn
+from torch.nn import functional as F
+from omegaconf import DictConfig
+from .utils.mask import make_pad_mask
+
+
+class MaskedDiffWithXvec(torch.nn.Module):
+    def __init__(self,
+                 input_size: int = 512,
+                 output_size: int = 80,
+                 spk_embed_dim: int = 192,
+                 output_type: str = "mel",
+                 vocab_size: int = 4096,
+                 input_frame_rate: int = 50,
+                 only_mask_loss: bool = True,
+                 encoder: torch.nn.Module = None,
+                 length_regulator: torch.nn.Module = None,
+                 decoder: torch.nn.Module = None,
+                 decoder_conf: Dict = {'in_channels': 240, 'out_channel': 80, 'spk_emb_dim': 80, 'n_spks': 1,
+                                       'cfm_params': DictConfig({'sigma_min': 1e-06, 'solver': 'euler', 't_scheduler': 'cosine',
+                                                                 'training_cfg_rate': 0.2, 'inference_cfg_rate': 0.7, 'reg_loss_type': 'l1'}),
+                                       'decoder_params': {'channels': [256, 256], 'dropout': 0.0, 'attention_head_dim': 64,
+                                                          'n_blocks': 4, 'num_mid_blocks': 12, 'num_heads': 8, 'act_fn': 'gelu'}},
+                 mel_feat_conf: Dict = {'n_fft': 1024, 'num_mels': 80, 'sampling_rate': 22050,
+                                        'hop_size': 256, 'win_size': 1024, 'fmin': 0, 'fmax': 8000}):
+        super().__init__()
+        self.input_size = input_size
+        self.output_size = output_size
+        self.decoder_conf = decoder_conf
+        self.mel_feat_conf = mel_feat_conf
+        self.vocab_size = vocab_size
+        self.output_type = output_type
+        self.input_frame_rate = input_frame_rate
+        logging.info(f"input frame rate={self.input_frame_rate}")
+        self.input_embedding = nn.Embedding(vocab_size, input_size)
+        self.spk_embed_affine_layer = torch.nn.Linear(spk_embed_dim, output_size)
+        self.encoder = encoder
+        self.encoder_proj = torch.nn.Linear(self.encoder.output_size(), output_size)
+        self.decoder = decoder
+        self.length_regulator = length_regulator
+        self.only_mask_loss = only_mask_loss
+
+    def forward(
+            self,
+            batch: dict,
+            device: torch.device,
+    ) -> Dict[str, Optional[torch.Tensor]]:
+        token = batch['speech_token'].to(device)
+        token_len = batch['speech_token_len'].to(device)
+        feat = batch['speech_feat'].to(device)
+        feat_len = batch['speech_feat_len'].to(device)
+        embedding = batch['embedding'].to(device)
+
+        # xvec projection
+        embedding = F.normalize(embedding, dim=1)
+        embedding = self.spk_embed_affine_layer(embedding)
+
+        # concat text and prompt_text
+        mask = (~make_pad_mask(token_len)).float().unsqueeze(-1).to(device)
+        token = self.input_embedding(torch.clamp(token, min=0)) * mask
+
+        # text encode
+        h, h_lengths = self.encoder(token, token_len)
+        h = self.encoder_proj(h)
+        h, h_lengths = self.length_regulator(h, feat_len)
+
+        # get conditions
+        conds = torch.zeros(feat.shape, device=token.device)
+        for i, j in enumerate(feat_len):
+            if random.random() < 0.5:
+                continue
+            index = random.randint(0, int(0.3 * j))
+            conds[i, :index] = feat[i, :index]
+        conds = conds.transpose(1, 2)
+
+        mask = (~make_pad_mask(feat_len)).to(h)
+        feat = F.interpolate(feat.unsqueeze(dim=1), size=h.shape[1:], mode="nearest").squeeze(dim=1)
+        loss, _ = self.decoder.compute_loss(
+            feat.transpose(1, 2).contiguous(),
+            mask.unsqueeze(1),
+            h.transpose(1, 2).contiguous(),
+            embedding,
+            cond=conds
+        )
+        return {'loss': loss}
+
+    @torch.inference_mode()
+    def inference(self,
+                  token,
+                  token_len,
+                  prompt_token,
+                  prompt_token_len,
+                  prompt_feat,
+                  prompt_feat_len,
+                  embedding,
+                  flow_cache):
+        if self.fp16 is True:
+            prompt_feat = prompt_feat.half()
+            embedding = embedding.half()
+
+        assert token.shape[0] == 1
+        # xvec projection
+        embedding = F.normalize(embedding, dim=1)
+        embedding = self.spk_embed_affine_layer(embedding)
+
+        # concat text and prompt_text
+        token_len1, token_len2 = prompt_token.shape[1], token.shape[1]
+        token, token_len = torch.concat([prompt_token, token], dim=1), prompt_token_len + token_len
+        mask = (~make_pad_mask(token_len)).unsqueeze(-1).to(embedding)
+        token = self.input_embedding(torch.clamp(token, min=0)) * mask
+
+        # text encode
+        h, h_lengths = self.encoder(token, token_len)
+        h = self.encoder_proj(h)
+        mel_len1, mel_len2 = prompt_feat.shape[1], int(token_len2 / self.input_frame_rate * 22050 / 256)
+        h, h_lengths = self.length_regulator.inference(h[:, :token_len1], h[:, token_len1:], mel_len1, mel_len2, self.input_frame_rate)
+
+        # get conditions
+        conds = torch.zeros([1, mel_len1 + mel_len2, self.output_size], device=token.device).to(h.dtype)
+        conds[:, :mel_len1] = prompt_feat
+        conds = conds.transpose(1, 2)
+
+        mask = (~make_pad_mask(torch.tensor([mel_len1 + mel_len2]))).to(h)
+        feat, flow_cache = self.decoder(
+            mu=h.transpose(1, 2).contiguous(),
+            mask=mask.unsqueeze(1),
+            spks=embedding,
+            cond=conds,
+            n_timesteps=10,
+            prompt_len=mel_len1,
+            flow_cache=flow_cache
+        )
+        feat = feat[:, :, mel_len1:]
+        assert feat.shape[2] == mel_len2
+        return feat.float(), flow_cache
+
+
+class CausalMaskedDiffWithXvec(torch.nn.Module):
+    def __init__(self,
+                 input_size: int = 512,
+                 output_size: int = 80,
+                 spk_embed_dim: int = 192,
+                 output_type: str = "mel",
+                 vocab_size: int = 6561,
+                 input_frame_rate: int = 25,
+                 only_mask_loss: bool = True,
+                 token_mel_ratio: int = 2,
+                 pre_lookahead_len: int = 3,
+                 encoder: torch.nn.Module = None,
+                 decoder: torch.nn.Module = None,
+                 decoder_conf: Dict = {'in_channels': 240, 'out_channel': 80, 'spk_emb_dim': 80, 'n_spks': 1,
+                                       'cfm_params': DictConfig({'sigma_min': 1e-06, 'solver': 'euler', 't_scheduler': 'cosine',
+                                                                 'training_cfg_rate': 0.2, 'inference_cfg_rate': 0.7, 'reg_loss_type': 'l1'}),
+                                       'decoder_params': {'channels': [256, 256], 'dropout': 0.0, 'attention_head_dim': 64,
+                                                          'n_blocks': 4, 'num_mid_blocks': 12, 'num_heads': 8, 'act_fn': 'gelu'}},
+                 mel_feat_conf: Dict = {'n_fft': 1024, 'num_mels': 80, 'sampling_rate': 22050,
+                                        'hop_size': 256, 'win_size': 1024, 'fmin': 0, 'fmax': 8000}):
+        super().__init__()
+        self.input_size = input_size
+        self.output_size = output_size
+        self.decoder_conf = decoder_conf
+        self.mel_feat_conf = mel_feat_conf
+        self.vocab_size = vocab_size
+        self.output_type = output_type
+        self.input_frame_rate = input_frame_rate
+        logging.info(f"input frame rate={self.input_frame_rate}")
+        self.input_embedding = nn.Embedding(vocab_size, input_size)
+        self.spk_embed_affine_layer = torch.nn.Linear(spk_embed_dim, output_size)
+        self.encoder = encoder
+        self.encoder_proj = torch.nn.Linear(self.encoder.output_size(), output_size)
+        self.decoder = decoder
+        self.only_mask_loss = only_mask_loss
+        self.token_mel_ratio = token_mel_ratio
+        self.pre_lookahead_len = pre_lookahead_len
+
+        # FIXME: this was missing - just putting it in as false
+        self.fp16 = False
+
+    @torch.inference_mode()
+    def inference(self,
+                  token,
+                  token_len,
+                  prompt_token,
+                  prompt_token_len,
+                  prompt_feat,
+                  prompt_feat_len,
+                  embedding,
+                  finalize):
+        if self.fp16 is True:
+            prompt_feat = prompt_feat.half()
+            embedding = embedding.half()
+
+        assert token.shape[0] == 1
+        # xvec projection
+        embedding = F.normalize(embedding, dim=1)
+        embedding = self.spk_embed_affine_layer(embedding)
+
+        # concat text and prompt_text
+        token, token_len = torch.concat([prompt_token, token], dim=1), prompt_token_len + token_len
+        mask = (~make_pad_mask(token_len)).unsqueeze(-1).to(embedding)
+        token = self.input_embedding(torch.clamp(token, min=0)) * mask
+
+        # text encode
+        h, h_lengths = self.encoder(token, token_len)
+        if finalize is False:
+            h = h[:, :-self.pre_lookahead_len * self.token_mel_ratio]
+        mel_len1, mel_len2 = prompt_feat.shape[1], h.shape[1] - prompt_feat.shape[1]
+        h = self.encoder_proj(h)
+
+        # get conditions
+        conds = torch.zeros([1, mel_len1 + mel_len2, self.output_size], device=token.device).to(h.dtype)
+        conds[:, :mel_len1] = prompt_feat
+        conds = conds.transpose(1, 2)
+
+        mask = (~make_pad_mask(torch.tensor([mel_len1 + mel_len2]))).to(h)
+        feat, _ = self.decoder(
+            mu=h.transpose(1, 2).contiguous(),
+            mask=mask.unsqueeze(1),
+            spks=embedding,
+            cond=conds,
+            n_timesteps=10
+        )
+        feat = feat[:, :, mel_len1:]
+        assert feat.shape[2] == mel_len2
+        return feat.float(), None  # NOTE jrm: why are they returning None here?

src/chatterbox/models/s3gen/flow_matching.py

@@ -0,0 +1,228 @@
+# Copyright (c) 2024 Alibaba Inc (authors: Xiang Lyu, Zhihao Du)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import threading
+import torch
+import torch.nn.functional as F
+from .matcha.flow_matching import BASECFM
+from omegaconf import OmegaConf
+
+
+CFM_PARAMS = OmegaConf.create({
+    "sigma_min": 1e-06,
+    "solver": "euler",
+    "t_scheduler": "cosine",
+    "training_cfg_rate": 0.2,
+    "inference_cfg_rate": 0.7,
+    "reg_loss_type": "l1"
+})
+
+
+class ConditionalCFM(BASECFM):
+    def __init__(self, in_channels, cfm_params, n_spks=1, spk_emb_dim=64, estimator: torch.nn.Module = None):
+        super().__init__(
+            n_feats=in_channels,
+            cfm_params=cfm_params,
+            n_spks=n_spks,
+            spk_emb_dim=spk_emb_dim,
+        )
+        self.t_scheduler = cfm_params.t_scheduler
+        self.training_cfg_rate = cfm_params.training_cfg_rate
+        self.inference_cfg_rate = cfm_params.inference_cfg_rate
+        in_channels = in_channels + (spk_emb_dim if n_spks > 0 else 0)
+        # Just change the architecture of the estimator here
+        self.estimator = estimator
+        self.lock = threading.Lock()
+
+    @torch.inference_mode()
+    def forward(self, mu, mask, n_timesteps, temperature=1.0, spks=None, cond=None, prompt_len=0, flow_cache=torch.zeros(1, 80, 0, 2)):
+        """Forward diffusion
+
+        Args:
+            mu (torch.Tensor): output of encoder
+                shape: (batch_size, n_feats, mel_timesteps)
+            mask (torch.Tensor): output_mask
+                shape: (batch_size, 1, mel_timesteps)
+            n_timesteps (int): number of diffusion steps
+            temperature (float, optional): temperature for scaling noise. Defaults to 1.0.
+            spks (torch.Tensor, optional): speaker ids. Defaults to None.
+                shape: (batch_size, spk_emb_dim)
+            cond: Not used but kept for future purposes
+
+        Returns:
+            sample: generated mel-spectrogram
+                shape: (batch_size, n_feats, mel_timesteps)
+        """
+
+        z = torch.randn_like(mu).to(mu.device).to(mu.dtype) * temperature
+        cache_size = flow_cache.shape[2]
+        # fix prompt and overlap part mu and z
+        if cache_size != 0:
+            z[:, :, :cache_size] = flow_cache[:, :, :, 0]
+            mu[:, :, :cache_size] = flow_cache[:, :, :, 1]
+        z_cache = torch.concat([z[:, :, :prompt_len], z[:, :, -34:]], dim=2)
+        mu_cache = torch.concat([mu[:, :, :prompt_len], mu[:, :, -34:]], dim=2)
+        flow_cache = torch.stack([z_cache, mu_cache], dim=-1)
+
+        t_span = torch.linspace(0, 1, n_timesteps + 1, device=mu.device, dtype=mu.dtype)
+        if self.t_scheduler == 'cosine':
+            t_span = 1 - torch.cos(t_span * 0.5 * torch.pi)
+        return self.solve_euler(z, t_span=t_span, mu=mu, mask=mask, spks=spks, cond=cond), flow_cache
+
+    def solve_euler(self, x, t_span, mu, mask, spks, cond):
+        """
+        Fixed euler solver for ODEs.
+        Args:
+            x (torch.Tensor): random noise
+            t_span (torch.Tensor): n_timesteps interpolated
+                shape: (n_timesteps + 1,)
+            mu (torch.Tensor): output of encoder
+                shape: (batch_size, n_feats, mel_timesteps)
+            mask (torch.Tensor): output_mask
+                shape: (batch_size, 1, mel_timesteps)
+            spks (torch.Tensor, optional): speaker ids. Defaults to None.
+                shape: (batch_size, spk_emb_dim)
+            cond: Not used but kept for future purposes
+        """
+        t, _, dt = t_span[0], t_span[-1], t_span[1] - t_span[0]
+        t = t.unsqueeze(dim=0)
+
+        # I am storing this because I can later plot it by putting a debugger here and saving it to a file
+        # Or in future might add like a return_all_steps flag
+        sol = []
+
+        # Do not use concat, it may cause memory format changed and trt infer with wrong results!
+        x_in = torch.zeros([2, 80, x.size(2)], device=x.device, dtype=x.dtype)
+        mask_in = torch.zeros([2, 1, x.size(2)], device=x.device, dtype=x.dtype)
+        mu_in = torch.zeros([2, 80, x.size(2)], device=x.device, dtype=x.dtype)
+        t_in = torch.zeros([2], device=x.device, dtype=x.dtype)
+        spks_in = torch.zeros([2, 80], device=x.device, dtype=x.dtype)
+        cond_in = torch.zeros([2, 80, x.size(2)], device=x.device, dtype=x.dtype)
+        for step in range(1, len(t_span)):
+            # Classifier-Free Guidance inference introduced in VoiceBox
+            x_in[:] = x
+            mask_in[:] = mask
+            mu_in[0] = mu
+            t_in[:] = t.unsqueeze(0)
+            spks_in[0] = spks
+            cond_in[0] = cond
+            dphi_dt = self.forward_estimator(
+                x_in, mask_in,
+                mu_in, t_in,
+                spks_in,
+                cond_in
+            )
+            dphi_dt, cfg_dphi_dt = torch.split(dphi_dt, [x.size(0), x.size(0)], dim=0)
+            dphi_dt = ((1.0 + self.inference_cfg_rate) * dphi_dt - self.inference_cfg_rate * cfg_dphi_dt)
+            x = x + dt * dphi_dt
+            t = t + dt
+            sol.append(x)
+            if step < len(t_span) - 1:
+                dt = t_span[step + 1] - t
+
+        return sol[-1].float()
+
+    def forward_estimator(self, x, mask, mu, t, spks, cond):
+        if isinstance(self.estimator, torch.nn.Module):
+            return self.estimator.forward(x, mask, mu, t, spks, cond)
+        else:
+            with self.lock:
+                self.estimator.set_input_shape('x', (2, 80, x.size(2)))
+                self.estimator.set_input_shape('mask', (2, 1, x.size(2)))
+                self.estimator.set_input_shape('mu', (2, 80, x.size(2)))
+                self.estimator.set_input_shape('t', (2,))
+                self.estimator.set_input_shape('spks', (2, 80))
+                self.estimator.set_input_shape('cond', (2, 80, x.size(2)))
+                # run trt engine
+                self.estimator.execute_v2([x.contiguous().data_ptr(),
+                                           mask.contiguous().data_ptr(),
+                                           mu.contiguous().data_ptr(),
+                                           t.contiguous().data_ptr(),
+                                           spks.contiguous().data_ptr(),
+                                           cond.contiguous().data_ptr(),
+                                           x.data_ptr()])
+            return x
+
+    def compute_loss(self, x1, mask, mu, spks=None, cond=None):
+        """Computes diffusion loss
+
+        Args:
+            x1 (torch.Tensor): Target
+                shape: (batch_size, n_feats, mel_timesteps)
+            mask (torch.Tensor): target mask
+                shape: (batch_size, 1, mel_timesteps)
+            mu (torch.Tensor): output of encoder
+                shape: (batch_size, n_feats, mel_timesteps)
+            spks (torch.Tensor, optional): speaker embedding. Defaults to None.
+                shape: (batch_size, spk_emb_dim)
+
+        Returns:
+            loss: conditional flow matching loss
+            y: conditional flow
+                shape: (batch_size, n_feats, mel_timesteps)
+        """
+        b, _, t = mu.shape
+
+        # random timestep
+        t = torch.rand([b, 1, 1], device=mu.device, dtype=mu.dtype)
+        if self.t_scheduler == 'cosine':
+            t = 1 - torch.cos(t * 0.5 * torch.pi)
+        # sample noise p(x_0)
+        z = torch.randn_like(x1)
+
+        y = (1 - (1 - self.sigma_min) * t) * z + t * x1
+        u = x1 - (1 - self.sigma_min) * z
+
+        # during training, we randomly drop condition to trade off mode coverage and sample fidelity
+        if self.training_cfg_rate > 0:
+            cfg_mask = torch.rand(b, device=x1.device) > self.training_cfg_rate
+            mu = mu * cfg_mask.view(-1, 1, 1)
+            spks = spks * cfg_mask.view(-1, 1)
+            cond = cond * cfg_mask.view(-1, 1, 1)
+
+        pred = self.estimator(y, mask, mu, t.squeeze(), spks, cond)
+        loss = F.mse_loss(pred * mask, u * mask, reduction="sum") / (torch.sum(mask) * u.shape[1])
+        return loss, y
+
+
+class CausalConditionalCFM(ConditionalCFM):
+    def __init__(self, in_channels=240, cfm_params=CFM_PARAMS, n_spks=1, spk_emb_dim=80, estimator=None):
+        super().__init__(in_channels, cfm_params, n_spks, spk_emb_dim, estimator)
+        self.rand_noise = torch.randn([1, 80, 50 * 300])
+
+    @torch.inference_mode()
+    def forward(self, mu, mask, n_timesteps, temperature=1.0, spks=None, cond=None):
+        """Forward diffusion
+
+        Args:
+            mu (torch.Tensor): output of encoder
+                shape: (batch_size, n_feats, mel_timesteps)
+            mask (torch.Tensor): output_mask
+                shape: (batch_size, 1, mel_timesteps)
+            n_timesteps (int): number of diffusion steps
+            temperature (float, optional): temperature for scaling noise. Defaults to 1.0.
+            spks (torch.Tensor, optional): speaker ids. Defaults to None.
+                shape: (batch_size, spk_emb_dim)
+            cond: Not used but kept for future purposes
+
+        Returns:
+            sample: generated mel-spectrogram
+                shape: (batch_size, n_feats, mel_timesteps)
+        """
+
+        z = self.rand_noise[:, :, :mu.size(2)].to(mu.device).to(mu.dtype) * temperature
+        # fix prompt and overlap part mu and z
+        t_span = torch.linspace(0, 1, n_timesteps + 1, device=mu.device, dtype=mu.dtype)
+        if self.t_scheduler == 'cosine':
+            t_span = 1 - torch.cos(t_span * 0.5 * torch.pi)
+        return self.solve_euler(z, t_span=t_span, mu=mu, mask=mask, spks=spks, cond=cond), None

src/chatterbox/models/s3gen/hifigan.py

@@ -0,0 +1,474 @@
+# jrm: adapted from CosyVoice/cosyvoice/hifigan/generator.py
+#      most modules should be reusable, but I found their SineGen changed a git.
+
+# Copyright (c) 2024 Alibaba Inc (authors: Xiang Lyu, Kai Hu)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""HIFI-GAN"""
+
+from typing import Dict, Optional, List
+import numpy as np
+from scipy.signal import get_window
+import torch
+import torch.nn.functional as F
+from torch.nn import Conv1d
+from torch.nn import ConvTranspose1d
+from torch.nn.utils import remove_weight_norm
+from torch.nn.utils.parametrizations import weight_norm
+from torch.distributions.uniform import Uniform
+from torch import nn, sin, pow
+from torch.nn import Parameter
+
+
+class Snake(nn.Module):
+    '''
+    Implementation of a sine-based periodic activation function
+    Shape:
+        - Input: (B, C, T)
+        - Output: (B, C, T), same shape as the input
+    Parameters:
+        - alpha - trainable parameter
+    References:
+        - This activation function is from this paper by Liu Ziyin, Tilman Hartwig, Masahito Ueda:
+        https://arxiv.org/abs/2006.08195
+    Examples:
+        >>> a1 = snake(256)
+        >>> x = torch.randn(256)
+        >>> x = a1(x)
+    '''
+    def __init__(self, in_features, alpha=1.0, alpha_trainable=True, alpha_logscale=False):
+        '''
+        Initialization.
+        INPUT:
+            - in_features: shape of the input
+            - alpha: trainable parameter
+            alpha is initialized to 1 by default, higher values = higher-frequency.
+            alpha will be trained along with the rest of your model.
+        '''
+        super(Snake, self).__init__()
+        self.in_features = in_features
+
+        # initialize alpha
+        self.alpha_logscale = alpha_logscale
+        if self.alpha_logscale: # log scale alphas initialized to zeros
+            self.alpha = Parameter(torch.zeros(in_features) * alpha)
+        else: # linear scale alphas initialized to ones
+            self.alpha = Parameter(torch.ones(in_features) * alpha)
+
+        self.alpha.requires_grad = alpha_trainable
+
+        self.no_div_by_zero = 0.000000001
+
+    def forward(self, x):
+        '''
+        Forward pass of the function.
+        Applies the function to the input elementwise.
+        Snake ∶= x + 1/a * sin^2 (xa)
+        '''
+        alpha = self.alpha.unsqueeze(0).unsqueeze(-1) # line up with x to [B, C, T]
+        if self.alpha_logscale:
+            alpha = torch.exp(alpha)
+        x = x + (1.0 / (alpha + self.no_div_by_zero)) * pow(sin(x * alpha), 2)
+
+        return x
+
+
+
+def get_padding(kernel_size, dilation=1):
+    return int((kernel_size * dilation - dilation) / 2)
+
+def init_weights(m, mean=0.0, std=0.01):
+    classname = m.__class__.__name__
+    if classname.find("Conv") != -1:
+        m.weight.data.normal_(mean, std)
+
+
+"""hifigan based generator implementation.
+
+This code is modified from https://github.com/jik876/hifi-gan
+ ,https://github.com/kan-bayashi/ParallelWaveGAN and
+ https://github.com/NVIDIA/BigVGAN
+
+"""
+
+
+class ResBlock(torch.nn.Module):
+    """Residual block module in HiFiGAN/BigVGAN."""
+    def __init__(
+        self,
+        channels: int = 512,
+        kernel_size: int = 3,
+        dilations: List[int] = [1, 3, 5],
+    ):
+        super(ResBlock, self).__init__()
+        self.convs1 = nn.ModuleList()
+        self.convs2 = nn.ModuleList()
+
+        for dilation in dilations:
+            self.convs1.append(
+                weight_norm(
+                    Conv1d(
+                        channels,
+                        channels,
+                        kernel_size,
+                        1,
+                        dilation=dilation,
+                        padding=get_padding(kernel_size, dilation)
+                    )
+                )
+            )
+            self.convs2.append(
+                weight_norm(
+                    Conv1d(
+                        channels,
+                        channels,
+                        kernel_size,
+                        1,
+                        dilation=1,
+                        padding=get_padding(kernel_size, 1)
+                    )
+                )
+            )
+        self.convs1.apply(init_weights)
+        self.convs2.apply(init_weights)
+        self.activations1 = nn.ModuleList([
+            Snake(channels, alpha_logscale=False)
+            for _ in range(len(self.convs1))
+        ])
+        self.activations2 = nn.ModuleList([
+            Snake(channels, alpha_logscale=False)
+            for _ in range(len(self.convs2))
+        ])
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        for idx in range(len(self.convs1)):
+            xt = self.activations1[idx](x)
+            xt = self.convs1[idx](xt)
+            xt = self.activations2[idx](xt)
+            xt = self.convs2[idx](xt)
+            x = xt + x
+        return x
+
+    def remove_weight_norm(self):
+        for idx in range(len(self.convs1)):
+            remove_weight_norm(self.convs1[idx])
+            remove_weight_norm(self.convs2[idx])
+
+
+class SineGen(torch.nn.Module):
+    """ Definition of sine generator
+    SineGen(samp_rate, harmonic_num = 0,
+            sine_amp = 0.1, noise_std = 0.003,
+            voiced_threshold = 0,
+            flag_for_pulse=False)
+    samp_rate: sampling rate in Hz
+    harmonic_num: number of harmonic overtones (default 0)
+    sine_amp: amplitude of sine-wavefrom (default 0.1)
+    noise_std: std of Gaussian noise (default 0.003)
+    voiced_thoreshold: F0 threshold for U/V classification (default 0)
+    flag_for_pulse: this SinGen is used inside PulseGen (default False)
+    Note: when flag_for_pulse is True, the first time step of a voiced
+        segment is always sin(np.pi) or cos(0)
+    """
+
+    def __init__(self, samp_rate, harmonic_num=0,
+                 sine_amp=0.1, noise_std=0.003,
+                 voiced_threshold=0):
+        super(SineGen, self).__init__()
+        self.sine_amp = sine_amp
+        self.noise_std = noise_std
+        self.harmonic_num = harmonic_num
+        self.sampling_rate = samp_rate
+        self.voiced_threshold = voiced_threshold
+
+    def _f02uv(self, f0):
+        # generate uv signal
+        uv = (f0 > self.voiced_threshold).type(torch.float32)
+        return uv
+
+    @torch.no_grad()
+    def forward(self, f0):
+        """
+        :param f0: [B, 1, sample_len], Hz
+        :return: [B, 1, sample_len]
+        """
+
+        F_mat = torch.zeros((f0.size(0), self.harmonic_num + 1, f0.size(-1))).to(f0.device)
+        for i in range(self.harmonic_num + 1):
+            F_mat[:, i: i + 1, :] = f0 * (i + 1) / self.sampling_rate
+
+        theta_mat = 2 * np.pi * (torch.cumsum(F_mat, dim=-1) % 1)
+        u_dist = Uniform(low=-np.pi, high=np.pi)
+        phase_vec = u_dist.sample(sample_shape=(f0.size(0), self.harmonic_num + 1, 1)).to(F_mat.device)
+        phase_vec[:, 0, :] = 0
+
+        # generate sine waveforms
+        sine_waves = self.sine_amp * torch.sin(theta_mat + phase_vec)
+
+        # generate uv signal
+        uv = self._f02uv(f0)
+
+        # noise: for unvoiced should be similar to sine_amp
+        #        std = self.sine_amp/3 -> max value ~ self.sine_amp
+        # .       for voiced regions is self.noise_std
+        noise_amp = uv * self.noise_std + (1 - uv) * self.sine_amp / 3
+        noise = noise_amp * torch.randn_like(sine_waves)
+
+        # first: set the unvoiced part to 0 by uv
+        # then: additive noise
+        sine_waves = sine_waves * uv + noise
+        return sine_waves, uv, noise
+
+
+class SourceModuleHnNSF(torch.nn.Module):
+    """ SourceModule for hn-nsf
+    SourceModule(sampling_rate, harmonic_num=0, sine_amp=0.1,
+                 add_noise_std=0.003, voiced_threshod=0)
+    sampling_rate: sampling_rate in Hz
+    harmonic_num: number of harmonic above F0 (default: 0)
+    sine_amp: amplitude of sine source signal (default: 0.1)
+    add_noise_std: std of additive Gaussian noise (default: 0.003)
+        note that amplitude of noise in unvoiced is decided
+        by sine_amp
+    voiced_threshold: threhold to set U/V given F0 (default: 0)
+    Sine_source, noise_source = SourceModuleHnNSF(F0_sampled)
+    F0_sampled (batchsize, length, 1)
+    Sine_source (batchsize, length, 1)
+    noise_source (batchsize, length 1)
+    uv (batchsize, length, 1)
+    """
+
+    def __init__(self, sampling_rate, upsample_scale, harmonic_num=0, sine_amp=0.1,
+                 add_noise_std=0.003, voiced_threshod=0):
+        super(SourceModuleHnNSF, self).__init__()
+
+        self.sine_amp = sine_amp
+        self.noise_std = add_noise_std
+
+        # to produce sine waveforms
+        self.l_sin_gen = SineGen(sampling_rate, harmonic_num,
+                                 sine_amp, add_noise_std, voiced_threshod)
+
+        # to merge source harmonics into a single excitation
+        self.l_linear = torch.nn.Linear(harmonic_num + 1, 1)
+        self.l_tanh = torch.nn.Tanh()
+
+    def forward(self, x):
+        """
+        Sine_source, noise_source = SourceModuleHnNSF(F0_sampled)
+        F0_sampled (batchsize, length, 1)
+        Sine_source (batchsize, length, 1)
+        noise_source (batchsize, length 1)
+        """
+        # source for harmonic branch
+        with torch.no_grad():
+            sine_wavs, uv, _ = self.l_sin_gen(x.transpose(1, 2))
+            sine_wavs = sine_wavs.transpose(1, 2)
+            uv = uv.transpose(1, 2)
+        sine_merge = self.l_tanh(self.l_linear(sine_wavs))
+
+        # source for noise branch, in the same shape as uv
+        noise = torch.randn_like(uv) * self.sine_amp / 3
+        return sine_merge, noise, uv
+
+
+class HiFTGenerator(nn.Module):
+    """
+    HiFTNet Generator: Neural Source Filter + ISTFTNet
+    https://arxiv.org/abs/2309.09493
+    """
+    def __init__(
+            self,
+            in_channels: int = 80,
+            base_channels: int = 512,
+            nb_harmonics: int = 8,
+            sampling_rate: int = 22050,
+            nsf_alpha: float = 0.1,
+            nsf_sigma: float = 0.003,
+            nsf_voiced_threshold: float = 10,
+            upsample_rates: List[int] = [8, 8],
+            upsample_kernel_sizes: List[int] = [16, 16],
+            istft_params: Dict[str, int] = {"n_fft": 16, "hop_len": 4},
+            resblock_kernel_sizes: List[int] = [3, 7, 11],
+            resblock_dilation_sizes: List[List[int]] = [[1, 3, 5], [1, 3, 5], [1, 3, 5]],
+            source_resblock_kernel_sizes: List[int] = [7, 11],
+            source_resblock_dilation_sizes: List[List[int]] = [[1, 3, 5], [1, 3, 5]],
+            lrelu_slope: float = 0.1,
+            audio_limit: float = 0.99,
+            f0_predictor: torch.nn.Module = None,
+    ):
+        super(HiFTGenerator, self).__init__()
+
+        self.out_channels = 1
+        self.nb_harmonics = nb_harmonics
+        self.sampling_rate = sampling_rate
+        self.istft_params = istft_params
+        self.lrelu_slope = lrelu_slope
+        self.audio_limit = audio_limit
+
+        self.num_kernels = len(resblock_kernel_sizes)
+        self.num_upsamples = len(upsample_rates)
+        self.m_source = SourceModuleHnNSF(
+            sampling_rate=sampling_rate,
+            upsample_scale=np.prod(upsample_rates) * istft_params["hop_len"],
+            harmonic_num=nb_harmonics,
+            sine_amp=nsf_alpha,
+            add_noise_std=nsf_sigma,
+            voiced_threshod=nsf_voiced_threshold)
+        self.f0_upsamp = torch.nn.Upsample(scale_factor=np.prod(upsample_rates) * istft_params["hop_len"])
+
+        self.conv_pre = weight_norm(
+            Conv1d(in_channels, base_channels, 7, 1, padding=3)
+        )
+
+        # Up
+        self.ups = nn.ModuleList()
+        for i, (u, k) in enumerate(zip(upsample_rates, upsample_kernel_sizes)):
+            self.ups.append(
+                weight_norm(
+                    ConvTranspose1d(
+                        base_channels // (2**i),
+                        base_channels // (2**(i + 1)),
+                        k,
+                        u,
+                        padding=(k - u) // 2,
+                    )
+                )
+            )
+
+        # Down
+        self.source_downs = nn.ModuleList()
+        self.source_resblocks = nn.ModuleList()
+        downsample_rates = [1] + upsample_rates[::-1][:-1]
+        downsample_cum_rates = np.cumprod(downsample_rates)
+        for i, (u, k, d) in enumerate(zip(downsample_cum_rates[::-1], source_resblock_kernel_sizes, source_resblock_dilation_sizes)):
+            if u == 1:
+                self.source_downs.append(
+                    Conv1d(istft_params["n_fft"] + 2, base_channels // (2 ** (i + 1)), 1, 1)
+                )
+            else:
+                self.source_downs.append(
+                    Conv1d(istft_params["n_fft"] + 2, base_channels // (2 ** (i + 1)), u * 2, u, padding=(u // 2))
+                )
+
+            self.source_resblocks.append(
+                ResBlock(base_channels // (2 ** (i + 1)), k, d)
+            )
+
+        self.resblocks = nn.ModuleList()
+        for i in range(len(self.ups)):
+            ch = base_channels // (2**(i + 1))
+            for _, (k, d) in enumerate(zip(resblock_kernel_sizes, resblock_dilation_sizes)):
+                self.resblocks.append(ResBlock(ch, k, d))
+
+        self.conv_post = weight_norm(Conv1d(ch, istft_params["n_fft"] + 2, 7, 1, padding=3))
+        self.ups.apply(init_weights)
+        self.conv_post.apply(init_weights)
+        self.reflection_pad = nn.ReflectionPad1d((1, 0))
+        self.stft_window = torch.from_numpy(get_window("hann", istft_params["n_fft"], fftbins=True).astype(np.float32))
+        self.f0_predictor = f0_predictor
+
+    def remove_weight_norm(self):
+        print('Removing weight norm...')
+        for l in self.ups:
+            remove_weight_norm(l)
+        for l in self.resblocks:
+            l.remove_weight_norm()
+        remove_weight_norm(self.conv_pre)
+        remove_weight_norm(self.conv_post)
+        self.m_source.remove_weight_norm()
+        for l in self.source_downs:
+            remove_weight_norm(l)
+        for l in self.source_resblocks:
+            l.remove_weight_norm()
+
+    def _stft(self, x):
+        spec = torch.stft(
+            x,
+            self.istft_params["n_fft"], self.istft_params["hop_len"], self.istft_params["n_fft"], window=self.stft_window.to(x.device),
+            return_complex=True)
+        spec = torch.view_as_real(spec)  # [B, F, TT, 2]
+        return spec[..., 0], spec[..., 1]
+
+    def _istft(self, magnitude, phase):
+        magnitude = torch.clip(magnitude, max=1e2)
+        real = magnitude * torch.cos(phase)
+        img = magnitude * torch.sin(phase)
+        inverse_transform = torch.istft(torch.complex(real, img), self.istft_params["n_fft"], self.istft_params["hop_len"],
+                                        self.istft_params["n_fft"], window=self.stft_window.to(magnitude.device))
+        return inverse_transform
+
+    def decode(self, x: torch.Tensor, s: torch.Tensor = torch.zeros(1, 1, 0)) -> torch.Tensor:
+        s_stft_real, s_stft_imag = self._stft(s.squeeze(1))
+        s_stft = torch.cat([s_stft_real, s_stft_imag], dim=1)
+
+        x = self.conv_pre(x)
+        for i in range(self.num_upsamples):
+            x = F.leaky_relu(x, self.lrelu_slope)
+            x = self.ups[i](x)
+
+            if i == self.num_upsamples - 1:
+                x = self.reflection_pad(x)
+
+            # fusion
+            si = self.source_downs[i](s_stft)
+            si = self.source_resblocks[i](si)
+            x = x + si
+
+            xs = None
+            for j in range(self.num_kernels):
+                if xs is None:
+                    xs = self.resblocks[i * self.num_kernels + j](x)
+                else:
+                    xs += self.resblocks[i * self.num_kernels + j](x)
+            x = xs / self.num_kernels
+
+        x = F.leaky_relu(x)
+        x = self.conv_post(x)
+        magnitude = torch.exp(x[:, :self.istft_params["n_fft"] // 2 + 1, :])
+        phase = torch.sin(x[:, self.istft_params["n_fft"] // 2 + 1:, :])  # actually, sin is redundancy
+
+        x = self._istft(magnitude, phase)
+        x = torch.clamp(x, -self.audio_limit, self.audio_limit)
+        return x
+
+    def forward(
+            self,
+            batch: dict,
+            device: torch.device,
+    ) -> Dict[str, Optional[torch.Tensor]]:
+        speech_feat = batch['speech_feat'].transpose(1, 2).to(device)
+        # mel->f0
+        f0 = self.f0_predictor(speech_feat)
+        # f0->source
+        s = self.f0_upsamp(f0[:, None]).transpose(1, 2)  # bs,n,t
+        s, _, _ = self.m_source(s)
+        s = s.transpose(1, 2)
+        # mel+source->speech
+        generated_speech = self.decode(x=speech_feat, s=s)
+        return generated_speech, f0
+
+    @torch.inference_mode()
+    def inference(self, speech_feat: torch.Tensor, cache_source: torch.Tensor = torch.zeros(1, 1, 0)) -> torch.Tensor:
+        # mel->f0
+        f0 = self.f0_predictor(speech_feat)
+        # f0->source
+        s = self.f0_upsamp(f0[:, None]).transpose(1, 2)  # bs,n,t
+        s, _, _ = self.m_source(s)
+        s = s.transpose(1, 2)
+        # use cache_source to avoid glitch
+        if cache_source.shape[2] != 0:
+            s[:, :, :cache_source.shape[2]] = cache_source
+        generated_speech = self.decode(x=speech_feat, s=s)
+        return generated_speech, s

src/chatterbox/models/s3gen/matcha/decoder.py

@@ -0,0 +1,443 @@
+import math
+from typing import Optional
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+from conformer import ConformerBlock
+from diffusers.models.activations import get_activation
+from einops import pack, rearrange, repeat
+
+from .transformer import BasicTransformerBlock
+
+
+class SinusoidalPosEmb(torch.nn.Module):
+    def __init__(self, dim):
+        super().__init__()
+        self.dim = dim
+        assert self.dim % 2 == 0, "SinusoidalPosEmb requires dim to be even"
+
+    def forward(self, x, scale=1000):
+        if x.ndim < 1:
+            x = x.unsqueeze(0)
+        device = x.device
+        half_dim = self.dim // 2
+        emb = math.log(10000) / (half_dim - 1)
+        emb = torch.exp(torch.arange(half_dim, device=device).float() * -emb)
+        emb = scale * x.unsqueeze(1) * emb.unsqueeze(0)
+        emb = torch.cat((emb.sin(), emb.cos()), dim=-1)
+        return emb
+
+
+class Block1D(torch.nn.Module):
+    def __init__(self, dim, dim_out, groups=8):
+        super().__init__()
+        self.block = torch.nn.Sequential(
+            torch.nn.Conv1d(dim, dim_out, 3, padding=1),
+            torch.nn.GroupNorm(groups, dim_out),
+            nn.Mish(),
+        )
+
+    def forward(self, x, mask):
+        output = self.block(x * mask)
+        return output * mask
+
+
+class ResnetBlock1D(torch.nn.Module):
+    def __init__(self, dim, dim_out, time_emb_dim, groups=8):
+        super().__init__()
+        self.mlp = torch.nn.Sequential(nn.Mish(), torch.nn.Linear(time_emb_dim, dim_out))
+
+        self.block1 = Block1D(dim, dim_out, groups=groups)
+        self.block2 = Block1D(dim_out, dim_out, groups=groups)
+
+        self.res_conv = torch.nn.Conv1d(dim, dim_out, 1)
+
+    def forward(self, x, mask, time_emb):
+        h = self.block1(x, mask)
+        h += self.mlp(time_emb).unsqueeze(-1)
+        h = self.block2(h, mask)
+        output = h + self.res_conv(x * mask)
+        return output
+
+
+class Downsample1D(nn.Module):
+    def __init__(self, dim):
+        super().__init__()
+        self.conv = torch.nn.Conv1d(dim, dim, 3, 2, 1)
+
+    def forward(self, x):
+        return self.conv(x)
+
+
+class TimestepEmbedding(nn.Module):
+    def __init__(
+        self,
+        in_channels: int,
+        time_embed_dim: int,
+        act_fn: str = "silu",
+        out_dim: int = None,
+        post_act_fn: Optional[str] = None,
+        cond_proj_dim=None,
+    ):
+        super().__init__()
+
+        self.linear_1 = nn.Linear(in_channels, time_embed_dim)
+
+        if cond_proj_dim is not None:
+            self.cond_proj = nn.Linear(cond_proj_dim, in_channels, bias=False)
+        else:
+            self.cond_proj = None
+
+        self.act = get_activation(act_fn)
+
+        if out_dim is not None:
+            time_embed_dim_out = out_dim
+        else:
+            time_embed_dim_out = time_embed_dim
+        self.linear_2 = nn.Linear(time_embed_dim, time_embed_dim_out)
+
+        if post_act_fn is None:
+            self.post_act = None
+        else:
+            self.post_act = get_activation(post_act_fn)
+
+    def forward(self, sample, condition=None):
+        if condition is not None:
+            sample = sample + self.cond_proj(condition)
+        sample = self.linear_1(sample)
+
+        if self.act is not None:
+            sample = self.act(sample)
+
+        sample = self.linear_2(sample)
+
+        if self.post_act is not None:
+            sample = self.post_act(sample)
+        return sample
+
+
+class Upsample1D(nn.Module):
+    """A 1D upsampling layer with an optional convolution.
+
+    Parameters:
+        channels (`int`):
+            number of channels in the inputs and outputs.
+        use_conv (`bool`, default `False`):
+            option to use a convolution.
+        use_conv_transpose (`bool`, default `False`):
+            option to use a convolution transpose.
+        out_channels (`int`, optional):
+            number of output channels. Defaults to `channels`.
+    """
+
+    def __init__(self, channels, use_conv=False, use_conv_transpose=True, out_channels=None, name="conv"):
+        super().__init__()
+        self.channels = channels
+        self.out_channels = out_channels or channels
+        self.use_conv = use_conv
+        self.use_conv_transpose = use_conv_transpose
+        self.name = name
+
+        self.conv = None
+        if use_conv_transpose:
+            self.conv = nn.ConvTranspose1d(channels, self.out_channels, 4, 2, 1)
+        elif use_conv:
+            self.conv = nn.Conv1d(self.channels, self.out_channels, 3, padding=1)
+
+    def forward(self, inputs):
+        assert inputs.shape[1] == self.channels
+        if self.use_conv_transpose:
+            return self.conv(inputs)
+
+        outputs = F.interpolate(inputs, scale_factor=2.0, mode="nearest")
+
+        if self.use_conv:
+            outputs = self.conv(outputs)
+
+        return outputs
+
+
+class ConformerWrapper(ConformerBlock):
+    def __init__(  # pylint: disable=useless-super-delegation
+        self,
+        *,
+        dim,
+        dim_head=64,
+        heads=8,
+        ff_mult=4,
+        conv_expansion_factor=2,
+        conv_kernel_size=31,
+        attn_dropout=0,
+        ff_dropout=0,
+        conv_dropout=0,
+        conv_causal=False,
+    ):
+        super().__init__(
+            dim=dim,
+            dim_head=dim_head,
+            heads=heads,
+            ff_mult=ff_mult,
+            conv_expansion_factor=conv_expansion_factor,
+            conv_kernel_size=conv_kernel_size,
+            attn_dropout=attn_dropout,
+            ff_dropout=ff_dropout,
+            conv_dropout=conv_dropout,
+            conv_causal=conv_causal,
+        )
+
+    def forward(
+        self,
+        hidden_states,
+        attention_mask,
+        encoder_hidden_states=None,
+        encoder_attention_mask=None,
+        timestep=None,
+    ):
+        return super().forward(x=hidden_states, mask=attention_mask.bool())
+
+
+class Decoder(nn.Module):
+    def __init__(
+        self,
+        in_channels,
+        out_channels,
+        channels=(256, 256),
+        dropout=0.05,
+        attention_head_dim=64,
+        n_blocks=1,
+        num_mid_blocks=2,
+        num_heads=4,
+        act_fn="snake",
+        down_block_type="transformer",
+        mid_block_type="transformer",
+        up_block_type="transformer",
+    ):
+        super().__init__()
+        channels = tuple(channels)
+        self.in_channels = in_channels
+        self.out_channels = out_channels
+
+        self.time_embeddings = SinusoidalPosEmb(in_channels)
+        time_embed_dim = channels[0] * 4
+        self.time_mlp = TimestepEmbedding(
+            in_channels=in_channels,
+            time_embed_dim=time_embed_dim,
+            act_fn="silu",
+        )
+
+        self.down_blocks = nn.ModuleList([])
+        self.mid_blocks = nn.ModuleList([])
+        self.up_blocks = nn.ModuleList([])
+
+        output_channel = in_channels
+        for i in range(len(channels)):  # pylint: disable=consider-using-enumerate
+            input_channel = output_channel
+            output_channel = channels[i]
+            is_last = i == len(channels) - 1
+            resnet = ResnetBlock1D(dim=input_channel, dim_out=output_channel, time_emb_dim=time_embed_dim)
+            transformer_blocks = nn.ModuleList(
+                [
+                    self.get_block(
+                        down_block_type,
+                        output_channel,
+                        attention_head_dim,
+                        num_heads,
+                        dropout,
+                        act_fn,
+                    )
+                    for _ in range(n_blocks)
+                ]
+            )
+            downsample = (
+                Downsample1D(output_channel) if not is_last else nn.Conv1d(output_channel, output_channel, 3, padding=1)
+            )
+
+            self.down_blocks.append(nn.ModuleList([resnet, transformer_blocks, downsample]))
+
+        for i in range(num_mid_blocks):
+            input_channel = channels[-1]
+            out_channels = channels[-1]
+
+            resnet = ResnetBlock1D(dim=input_channel, dim_out=output_channel, time_emb_dim=time_embed_dim)
+
+            transformer_blocks = nn.ModuleList(
+                [
+                    self.get_block(
+                        mid_block_type,
+                        output_channel,
+                        attention_head_dim,
+                        num_heads,
+                        dropout,
+                        act_fn,
+                    )
+                    for _ in range(n_blocks)
+                ]
+            )
+
+            self.mid_blocks.append(nn.ModuleList([resnet, transformer_blocks]))
+
+        channels = channels[::-1] + (channels[0],)
+        for i in range(len(channels) - 1):
+            input_channel = channels[i]
+            output_channel = channels[i + 1]
+            is_last = i == len(channels) - 2
+
+            resnet = ResnetBlock1D(
+                dim=2 * input_channel,
+                dim_out=output_channel,
+                time_emb_dim=time_embed_dim,
+            )
+            transformer_blocks = nn.ModuleList(
+                [
+                    self.get_block(
+                        up_block_type,
+                        output_channel,
+                        attention_head_dim,
+                        num_heads,
+                        dropout,
+                        act_fn,
+                    )
+                    for _ in range(n_blocks)
+                ]
+            )
+            upsample = (
+                Upsample1D(output_channel, use_conv_transpose=True)
+                if not is_last
+                else nn.Conv1d(output_channel, output_channel, 3, padding=1)
+            )
+
+            self.up_blocks.append(nn.ModuleList([resnet, transformer_blocks, upsample]))
+
+        self.final_block = Block1D(channels[-1], channels[-1])
+        self.final_proj = nn.Conv1d(channels[-1], self.out_channels, 1)
+
+        self.initialize_weights()
+        # nn.init.normal_(self.final_proj.weight)
+
+    @staticmethod
+    def get_block(block_type, dim, attention_head_dim, num_heads, dropout, act_fn):
+        if block_type == "conformer":
+            block = ConformerWrapper(
+                dim=dim,
+                dim_head=attention_head_dim,
+                heads=num_heads,
+                ff_mult=1,
+                conv_expansion_factor=2,
+                ff_dropout=dropout,
+                attn_dropout=dropout,
+                conv_dropout=dropout,
+                conv_kernel_size=31,
+            )
+        elif block_type == "transformer":
+            block = BasicTransformerBlock(
+                dim=dim,
+                num_attention_heads=num_heads,
+                attention_head_dim=attention_head_dim,
+                dropout=dropout,
+                activation_fn=act_fn,
+            )
+        else:
+            raise ValueError(f"Unknown block type {block_type}")
+
+        return block
+
+    def initialize_weights(self):
+        for m in self.modules():
+            if isinstance(m, nn.Conv1d):
+                nn.init.kaiming_normal_(m.weight, nonlinearity="relu")
+
+                if m.bias is not None:
+                    nn.init.constant_(m.bias, 0)
+
+            elif isinstance(m, nn.GroupNorm):
+                nn.init.constant_(m.weight, 1)
+                nn.init.constant_(m.bias, 0)
+
+            elif isinstance(m, nn.Linear):
+                nn.init.kaiming_normal_(m.weight, nonlinearity="relu")
+
+                if m.bias is not None:
+                    nn.init.constant_(m.bias, 0)
+
+    def forward(self, x, mask, mu, t, spks=None, cond=None):
+        """Forward pass of the UNet1DConditional model.
+
+        Args:
+            x (torch.Tensor): shape (batch_size, in_channels, time)
+            mask (_type_): shape (batch_size, 1, time)
+            t (_type_): shape (batch_size)
+            spks (_type_, optional): shape: (batch_size, condition_channels). Defaults to None.
+            cond (_type_, optional): placeholder for future use. Defaults to None.
+
+        Raises:
+            ValueError: _description_
+            ValueError: _description_
+
+        Returns:
+            _type_: _description_
+        """
+
+        t = self.time_embeddings(t)
+        t = self.time_mlp(t)
+
+        x = pack([x, mu], "b * t")[0]
+
+        if spks is not None:
+            spks = repeat(spks, "b c -> b c t", t=x.shape[-1])
+            x = pack([x, spks], "b * t")[0]
+
+        hiddens = []
+        masks = [mask]
+        for resnet, transformer_blocks, downsample in self.down_blocks:
+            mask_down = masks[-1]
+            x = resnet(x, mask_down, t)
+            x = rearrange(x, "b c t -> b t c")
+            mask_down = rearrange(mask_down, "b 1 t -> b t")
+            for transformer_block in transformer_blocks:
+                x = transformer_block(
+                    hidden_states=x,
+                    attention_mask=mask_down,
+                    timestep=t,
+                )
+            x = rearrange(x, "b t c -> b c t")
+            mask_down = rearrange(mask_down, "b t -> b 1 t")
+            hiddens.append(x)  # Save hidden states for skip connections
+            x = downsample(x * mask_down)
+            masks.append(mask_down[:, :, ::2])
+
+        masks = masks[:-1]
+        mask_mid = masks[-1]
+
+        for resnet, transformer_blocks in self.mid_blocks:
+            x = resnet(x, mask_mid, t)
+            x = rearrange(x, "b c t -> b t c")
+            mask_mid = rearrange(mask_mid, "b 1 t -> b t")
+            for transformer_block in transformer_blocks:
+                x = transformer_block(
+                    hidden_states=x,
+                    attention_mask=mask_mid,
+                    timestep=t,
+                )
+            x = rearrange(x, "b t c -> b c t")
+            mask_mid = rearrange(mask_mid, "b t -> b 1 t")
+
+        for resnet, transformer_blocks, upsample in self.up_blocks:
+            mask_up = masks.pop()
+            x = resnet(pack([x, hiddens.pop()], "b * t")[0], mask_up, t)
+            x = rearrange(x, "b c t -> b t c")
+            mask_up = rearrange(mask_up, "b 1 t -> b t")
+            for transformer_block in transformer_blocks:
+                x = transformer_block(
+                    hidden_states=x,
+                    attention_mask=mask_up,
+                    timestep=t,
+                )
+            x = rearrange(x, "b t c -> b c t")
+            mask_up = rearrange(mask_up, "b t -> b 1 t")
+            x = upsample(x * mask_up)
+
+        x = self.final_block(x, mask_up)
+        output = self.final_proj(x * mask_up)
+
+        return output * mask

src/chatterbox/models/s3gen/matcha/flow_matching.py

@@ -0,0 +1,129 @@
+from abc import ABC
+
+import torch
+import torch.nn.functional as F
+
+from .decoder import Decoder
+
+
+class BASECFM(torch.nn.Module, ABC):
+    def __init__(
+        self,
+        n_feats,
+        cfm_params,
+        n_spks=1,
+        spk_emb_dim=128,
+    ):
+        super().__init__()
+        self.n_feats = n_feats
+        self.n_spks = n_spks
+        self.spk_emb_dim = spk_emb_dim
+        self.solver = cfm_params.solver
+        if hasattr(cfm_params, "sigma_min"):
+            self.sigma_min = cfm_params.sigma_min
+        else:
+            self.sigma_min = 1e-4
+
+        self.estimator = None
+
+    @torch.inference_mode()
+    def forward(self, mu, mask, n_timesteps, temperature=1.0, spks=None, cond=None):
+        """Forward diffusion
+
+        Args:
+            mu (torch.Tensor): output of encoder
+                shape: (batch_size, n_feats, mel_timesteps)
+            mask (torch.Tensor): output_mask
+                shape: (batch_size, 1, mel_timesteps)
+            n_timesteps (int): number of diffusion steps
+            temperature (float, optional): temperature for scaling noise. Defaults to 1.0.
+            spks (torch.Tensor, optional): speaker ids. Defaults to None.
+                shape: (batch_size, spk_emb_dim)
+            cond: Not used but kept for future purposes
+
+        Returns:
+            sample: generated mel-spectrogram
+                shape: (batch_size, n_feats, mel_timesteps)
+        """
+        z = torch.randn_like(mu) * temperature
+        t_span = torch.linspace(0, 1, n_timesteps + 1, device=mu.device)
+        return self.solve_euler(z, t_span=t_span, mu=mu, mask=mask, spks=spks, cond=cond)
+
+    def solve_euler(self, x, t_span, mu, mask, spks, cond):
+        """
+        Fixed euler solver for ODEs.
+        Args:
+            x (torch.Tensor): random noise
+            t_span (torch.Tensor): n_timesteps interpolated
+                shape: (n_timesteps + 1,)
+            mu (torch.Tensor): output of encoder
+                shape: (batch_size, n_feats, mel_timesteps)
+            mask (torch.Tensor): output_mask
+                shape: (batch_size, 1, mel_timesteps)
+            spks (torch.Tensor, optional): speaker ids. Defaults to None.
+                shape: (batch_size, spk_emb_dim)
+            cond: Not used but kept for future purposes
+        """
+        t, _, dt = t_span[0], t_span[-1], t_span[1] - t_span[0]
+
+        # I am storing this because I can later plot it by putting a debugger here and saving it to a file
+        # Or in future might add like a return_all_steps flag
+        sol = []
+
+        for step in range(1, len(t_span)):
+            dphi_dt = self.estimator(x, mask, mu, t, spks, cond)
+
+            x = x + dt * dphi_dt
+            t = t + dt
+            sol.append(x)
+            if step < len(t_span) - 1:
+                dt = t_span[step + 1] - t
+
+        return sol[-1]
+
+    def compute_loss(self, x1, mask, mu, spks=None, cond=None):
+        """Computes diffusion loss
+
+        Args:
+            x1 (torch.Tensor): Target
+                shape: (batch_size, n_feats, mel_timesteps)
+            mask (torch.Tensor): target mask
+                shape: (batch_size, 1, mel_timesteps)
+            mu (torch.Tensor): output of encoder
+                shape: (batch_size, n_feats, mel_timesteps)
+            spks (torch.Tensor, optional): speaker embedding. Defaults to None.
+                shape: (batch_size, spk_emb_dim)
+
+        Returns:
+            loss: conditional flow matching loss
+            y: conditional flow
+                shape: (batch_size, n_feats, mel_timesteps)
+        """
+        b, _, t = mu.shape
+
+        # random timestep
+        t = torch.rand([b, 1, 1], device=mu.device, dtype=mu.dtype)
+        # sample noise p(x_0)
+        z = torch.randn_like(x1)
+
+        y = (1 - (1 - self.sigma_min) * t) * z + t * x1
+        u = x1 - (1 - self.sigma_min) * z
+
+        loss = F.mse_loss(self.estimator(y, mask, mu, t.squeeze(), spks), u, reduction="sum") / (
+            torch.sum(mask) * u.shape[1]
+        )
+        return loss, y
+
+
+class CFM(BASECFM):
+    def __init__(self, in_channels, out_channel, cfm_params, decoder_params, n_spks=1, spk_emb_dim=64):
+        super().__init__(
+            n_feats=in_channels,
+            cfm_params=cfm_params,
+            n_spks=n_spks,
+            spk_emb_dim=spk_emb_dim,
+        )
+
+        in_channels = in_channels + (spk_emb_dim if n_spks > 1 else 0)
+        # Just change the architecture of the estimator here
+        self.estimator = Decoder(in_channels=in_channels, out_channels=out_channel, **decoder_params)

src/chatterbox/models/s3gen/matcha/text_encoder.py

@@ -0,0 +1,413 @@
+""" from https://github.com/jaywalnut310/glow-tts """
+
+import math
+
+import torch
+import torch.nn as nn
+from einops import rearrange
+
+
+def sequence_mask(length, max_length=None):
+    if max_length is None:
+        max_length = length.max()
+    x = torch.arange(max_length, dtype=length.dtype, device=length.device)
+    return x.unsqueeze(0) < length.unsqueeze(1)
+
+
+
+class LayerNorm(nn.Module):
+    def __init__(self, channels, eps=1e-4):
+        super().__init__()
+        self.channels = channels
+        self.eps = eps
+
+        self.gamma = torch.nn.Parameter(torch.ones(channels))
+        self.beta = torch.nn.Parameter(torch.zeros(channels))
+
+    def forward(self, x):
+        n_dims = len(x.shape)
+        mean = torch.mean(x, 1, keepdim=True)
+        variance = torch.mean((x - mean) ** 2, 1, keepdim=True)
+
+        x = (x - mean) * torch.rsqrt(variance + self.eps)
+
+        shape = [1, -1] + [1] * (n_dims - 2)
+        x = x * self.gamma.view(*shape) + self.beta.view(*shape)
+        return x
+
+
+class ConvReluNorm(nn.Module):
+    def __init__(self, in_channels, hidden_channels, out_channels, kernel_size, n_layers, p_dropout):
+        super().__init__()
+        self.in_channels = in_channels
+        self.hidden_channels = hidden_channels
+        self.out_channels = out_channels
+        self.kernel_size = kernel_size
+        self.n_layers = n_layers
+        self.p_dropout = p_dropout
+
+        self.conv_layers = torch.nn.ModuleList()
+        self.norm_layers = torch.nn.ModuleList()
+        self.conv_layers.append(torch.nn.Conv1d(in_channels, hidden_channels, kernel_size, padding=kernel_size // 2))
+        self.norm_layers.append(LayerNorm(hidden_channels))
+        self.relu_drop = torch.nn.Sequential(torch.nn.ReLU(), torch.nn.Dropout(p_dropout))
+        for _ in range(n_layers - 1):
+            self.conv_layers.append(
+                torch.nn.Conv1d(hidden_channels, hidden_channels, kernel_size, padding=kernel_size // 2)
+            )
+            self.norm_layers.append(LayerNorm(hidden_channels))
+        self.proj = torch.nn.Conv1d(hidden_channels, out_channels, 1)
+        self.proj.weight.data.zero_()
+        self.proj.bias.data.zero_()
+
+    def forward(self, x, x_mask):
+        x_org = x
+        for i in range(self.n_layers):
+            x = self.conv_layers[i](x * x_mask)
+            x = self.norm_layers[i](x)
+            x = self.relu_drop(x)
+        x = x_org + self.proj(x)
+        return x * x_mask
+
+
+class DurationPredictor(nn.Module):
+    def __init__(self, in_channels, filter_channels, kernel_size, p_dropout):
+        super().__init__()
+        self.in_channels = in_channels
+        self.filter_channels = filter_channels
+        self.p_dropout = p_dropout
+
+        self.drop = torch.nn.Dropout(p_dropout)
+        self.conv_1 = torch.nn.Conv1d(in_channels, filter_channels, kernel_size, padding=kernel_size // 2)
+        self.norm_1 = LayerNorm(filter_channels)
+        self.conv_2 = torch.nn.Conv1d(filter_channels, filter_channels, kernel_size, padding=kernel_size // 2)
+        self.norm_2 = LayerNorm(filter_channels)
+        self.proj = torch.nn.Conv1d(filter_channels, 1, 1)
+
+    def forward(self, x, x_mask):
+        x = self.conv_1(x * x_mask)
+        x = torch.relu(x)
+        x = self.norm_1(x)
+        x = self.drop(x)
+        x = self.conv_2(x * x_mask)
+        x = torch.relu(x)
+        x = self.norm_2(x)
+        x = self.drop(x)
+        x = self.proj(x * x_mask)
+        return x * x_mask
+
+
+class RotaryPositionalEmbeddings(nn.Module):
+    """
+    ## RoPE module
+
+    Rotary encoding transforms pairs of features by rotating in the 2D plane.
+    That is, it organizes the $d$ features as $\frac{d}{2}$ pairs.
+    Each pair can be considered a coordinate in a 2D plane, and the encoding will rotate it
+    by an angle depending on the position of the token.
+    """
+
+    def __init__(self, d: int, base: int = 10_000):
+        r"""
+        * `d` is the number of features $d$
+        * `base` is the constant used for calculating $\Theta$
+        """
+        super().__init__()
+
+        self.base = base
+        self.d = int(d)
+        self.cos_cached = None
+        self.sin_cached = None
+
+    def _build_cache(self, x: torch.Tensor):
+        r"""
+        Cache $\cos$ and $\sin$ values
+        """
+        # Return if cache is already built
+        if self.cos_cached is not None and x.shape[0] <= self.cos_cached.shape[0]:
+            return
+
+        # Get sequence length
+        seq_len = x.shape[0]
+
+        # $\Theta = {\theta_i = 10000^{-\frac{2(i-1)}{d}}, i \in [1, 2, ..., \frac{d}{2}]}$
+        theta = 1.0 / (self.base ** (torch.arange(0, self.d, 2).float() / self.d)).to(x.device)
+
+        # Create position indexes `[0, 1, ..., seq_len - 1]`
+        seq_idx = torch.arange(seq_len, device=x.device).float().to(x.device)
+
+        # Calculate the product of position index and $\theta_i$
+        idx_theta = torch.einsum("n,d->nd", seq_idx, theta)
+
+        # Concatenate so that for row $m$ we have
+        # $[m \theta_0, m \theta_1, ..., m \theta_{\frac{d}{2}}, m \theta_0, m \theta_1, ..., m \theta_{\frac{d}{2}}]$
+        idx_theta2 = torch.cat([idx_theta, idx_theta], dim=1)
+
+        # Cache them
+        self.cos_cached = idx_theta2.cos()[:, None, None, :]
+        self.sin_cached = idx_theta2.sin()[:, None, None, :]
+
+    def _neg_half(self, x: torch.Tensor):
+        # $\frac{d}{2}$
+        d_2 = self.d // 2
+
+        # Calculate $[-x^{(\frac{d}{2} + 1)}, -x^{(\frac{d}{2} + 2)}, ..., -x^{(d)}, x^{(1)}, x^{(2)}, ..., x^{(\frac{d}{2})}]$
+        return torch.cat([-x[:, :, :, d_2:], x[:, :, :, :d_2]], dim=-1)
+
+    def forward(self, x: torch.Tensor):
+        """
+        * `x` is the Tensor at the head of a key or a query with shape `[seq_len, batch_size, n_heads, d]`
+        """
+        # Cache $\cos$ and $\sin$ values
+        x = rearrange(x, "b h t d -> t b h d")
+
+        self._build_cache(x)
+
+        # Split the features, we can choose to apply rotary embeddings only to a partial set of features.
+        x_rope, x_pass = x[..., : self.d], x[..., self.d :]
+
+        # Calculate
+        # $[-x^{(\frac{d}{2} + 1)}, -x^{(\frac{d}{2} + 2)}, ..., -x^{(d)}, x^{(1)}, x^{(2)}, ..., x^{(\frac{d}{2})}]$
+        neg_half_x = self._neg_half(x_rope)
+
+        x_rope = (x_rope * self.cos_cached[: x.shape[0]]) + (neg_half_x * self.sin_cached[: x.shape[0]])
+
+        return rearrange(torch.cat((x_rope, x_pass), dim=-1), "t b h d -> b h t d")
+
+
+class MultiHeadAttention(nn.Module):
+    def __init__(
+        self,
+        channels,
+        out_channels,
+        n_heads,
+        heads_share=True,
+        p_dropout=0.0,
+        proximal_bias=False,
+        proximal_init=False,
+    ):
+        super().__init__()
+        assert channels % n_heads == 0
+
+        self.channels = channels
+        self.out_channels = out_channels
+        self.n_heads = n_heads
+        self.heads_share = heads_share
+        self.proximal_bias = proximal_bias
+        self.p_dropout = p_dropout
+        self.attn = None
+
+        self.k_channels = channels // n_heads
+        self.conv_q = torch.nn.Conv1d(channels, channels, 1)
+        self.conv_k = torch.nn.Conv1d(channels, channels, 1)
+        self.conv_v = torch.nn.Conv1d(channels, channels, 1)
+
+        # from https://nn.labml.ai/transformers/rope/index.html
+        self.query_rotary_pe = RotaryPositionalEmbeddings(self.k_channels * 0.5)
+        self.key_rotary_pe = RotaryPositionalEmbeddings(self.k_channels * 0.5)
+
+        self.conv_o = torch.nn.Conv1d(channels, out_channels, 1)
+        self.drop = torch.nn.Dropout(p_dropout)
+
+        torch.nn.init.xavier_uniform_(self.conv_q.weight)
+        torch.nn.init.xavier_uniform_(self.conv_k.weight)
+        if proximal_init:
+            self.conv_k.weight.data.copy_(self.conv_q.weight.data)
+            self.conv_k.bias.data.copy_(self.conv_q.bias.data)
+        torch.nn.init.xavier_uniform_(self.conv_v.weight)
+
+    def forward(self, x, c, attn_mask=None):
+        q = self.conv_q(x)
+        k = self.conv_k(c)
+        v = self.conv_v(c)
+
+        x, self.attn = self.attention(q, k, v, mask=attn_mask)
+
+        x = self.conv_o(x)
+        return x
+
+    def attention(self, query, key, value, mask=None):
+        b, d, t_s, t_t = (*key.size(), query.size(2))
+        query = rearrange(query, "b (h c) t-> b h t c", h=self.n_heads)
+        key = rearrange(key, "b (h c) t-> b h t c", h=self.n_heads)
+        value = rearrange(value, "b (h c) t-> b h t c", h=self.n_heads)
+
+        query = self.query_rotary_pe(query)
+        key = self.key_rotary_pe(key)
+
+        scores = torch.matmul(query, key.transpose(-2, -1)) / math.sqrt(self.k_channels)
+
+        if self.proximal_bias:
+            assert t_s == t_t, "Proximal bias is only available for self-attention."
+            scores = scores + self._attention_bias_proximal(t_s).to(device=scores.device, dtype=scores.dtype)
+        if mask is not None:
+            scores = scores.masked_fill(mask == 0, -1e4)
+        p_attn = torch.nn.functional.softmax(scores, dim=-1)
+        p_attn = self.drop(p_attn)
+        output = torch.matmul(p_attn, value)
+        output = output.transpose(2, 3).contiguous().view(b, d, t_t)
+        return output, p_attn
+
+    @staticmethod
+    def _attention_bias_proximal(length):
+        r = torch.arange(length, dtype=torch.float32)
+        diff = torch.unsqueeze(r, 0) - torch.unsqueeze(r, 1)
+        return torch.unsqueeze(torch.unsqueeze(-torch.log1p(torch.abs(diff)), 0), 0)
+
+
+class FFN(nn.Module):
+    def __init__(self, in_channels, out_channels, filter_channels, kernel_size, p_dropout=0.0):
+        super().__init__()
+        self.in_channels = in_channels
+        self.out_channels = out_channels
+        self.filter_channels = filter_channels
+        self.kernel_size = kernel_size
+        self.p_dropout = p_dropout
+
+        self.conv_1 = torch.nn.Conv1d(in_channels, filter_channels, kernel_size, padding=kernel_size // 2)
+        self.conv_2 = torch.nn.Conv1d(filter_channels, out_channels, kernel_size, padding=kernel_size // 2)
+        self.drop = torch.nn.Dropout(p_dropout)
+
+    def forward(self, x, x_mask):
+        x = self.conv_1(x * x_mask)
+        x = torch.relu(x)
+        x = self.drop(x)
+        x = self.conv_2(x * x_mask)
+        return x * x_mask
+
+
+class Encoder(nn.Module):
+    def __init__(
+        self,
+        hidden_channels,
+        filter_channels,
+        n_heads,
+        n_layers,
+        kernel_size=1,
+        p_dropout=0.0,
+        **kwargs,
+    ):
+        super().__init__()
+        self.hidden_channels = hidden_channels
+        self.filter_channels = filter_channels
+        self.n_heads = n_heads
+        self.n_layers = n_layers
+        self.kernel_size = kernel_size
+        self.p_dropout = p_dropout
+
+        self.drop = torch.nn.Dropout(p_dropout)
+        self.attn_layers = torch.nn.ModuleList()
+        self.norm_layers_1 = torch.nn.ModuleList()
+        self.ffn_layers = torch.nn.ModuleList()
+        self.norm_layers_2 = torch.nn.ModuleList()
+        for _ in range(self.n_layers):
+            self.attn_layers.append(MultiHeadAttention(hidden_channels, hidden_channels, n_heads, p_dropout=p_dropout))
+            self.norm_layers_1.append(LayerNorm(hidden_channels))
+            self.ffn_layers.append(
+                FFN(
+                    hidden_channels,
+                    hidden_channels,
+                    filter_channels,
+                    kernel_size,
+                    p_dropout=p_dropout,
+                )
+            )
+            self.norm_layers_2.append(LayerNorm(hidden_channels))
+
+    def forward(self, x, x_mask):
+        attn_mask = x_mask.unsqueeze(2) * x_mask.unsqueeze(-1)
+        for i in range(self.n_layers):
+            x = x * x_mask
+            y = self.attn_layers[i](x, x, attn_mask)
+            y = self.drop(y)
+            x = self.norm_layers_1[i](x + y)
+            y = self.ffn_layers[i](x, x_mask)
+            y = self.drop(y)
+            x = self.norm_layers_2[i](x + y)
+        x = x * x_mask
+        return x
+
+
+class TextEncoder(nn.Module):
+    def __init__(
+        self,
+        encoder_type,
+        encoder_params,
+        duration_predictor_params,
+        n_vocab,
+        n_spks=1,
+        spk_emb_dim=128,
+    ):
+        super().__init__()
+        self.encoder_type = encoder_type
+        self.n_vocab = n_vocab
+        self.n_feats = encoder_params.n_feats
+        self.n_channels = encoder_params.n_channels
+        self.spk_emb_dim = spk_emb_dim
+        self.n_spks = n_spks
+
+        self.emb = torch.nn.Embedding(n_vocab, self.n_channels)
+        torch.nn.init.normal_(self.emb.weight, 0.0, self.n_channels**-0.5)
+
+        if encoder_params.prenet:
+            self.prenet = ConvReluNorm(
+                self.n_channels,
+                self.n_channels,
+                self.n_channels,
+                kernel_size=5,
+                n_layers=3,
+                p_dropout=0.5,
+            )
+        else:
+            self.prenet = lambda x, x_mask: x
+
+        self.encoder = Encoder(
+            encoder_params.n_channels + (spk_emb_dim if n_spks > 1 else 0),
+            encoder_params.filter_channels,
+            encoder_params.n_heads,
+            encoder_params.n_layers,
+            encoder_params.kernel_size,
+            encoder_params.p_dropout,
+        )
+
+        self.proj_m = torch.nn.Conv1d(self.n_channels + (spk_emb_dim if n_spks > 1 else 0), self.n_feats, 1)
+        self.proj_w = DurationPredictor(
+            self.n_channels + (spk_emb_dim if n_spks > 1 else 0),
+            duration_predictor_params.filter_channels_dp,
+            duration_predictor_params.kernel_size,
+            duration_predictor_params.p_dropout,
+        )
+
+    def forward(self, x, x_lengths, spks=None):
+        """Run forward pass to the transformer based encoder and duration predictor
+
+        Args:
+            x (torch.Tensor): text input
+                shape: (batch_size, max_text_length)
+            x_lengths (torch.Tensor): text input lengths
+                shape: (batch_size,)
+            spks (torch.Tensor, optional): speaker ids. Defaults to None.
+                shape: (batch_size,)
+
+        Returns:
+            mu (torch.Tensor): average output of the encoder
+                shape: (batch_size, n_feats, max_text_length)
+            logw (torch.Tensor): log duration predicted by the duration predictor
+                shape: (batch_size, 1, max_text_length)
+            x_mask (torch.Tensor): mask for the text input
+                shape: (batch_size, 1, max_text_length)
+        """
+        x = self.emb(x) * math.sqrt(self.n_channels)
+        x = torch.transpose(x, 1, -1)
+        x_mask = torch.unsqueeze(sequence_mask(x_lengths, x.size(2)), 1).to(x.dtype)
+
+        x = self.prenet(x, x_mask)
+        if self.n_spks > 1:
+            x = torch.cat([x, spks.unsqueeze(-1).repeat(1, 1, x.shape[-1])], dim=1)
+        x = self.encoder(x, x_mask)
+        mu = self.proj_m(x) * x_mask
+
+        x_dp = torch.detach(x)
+        logw = self.proj_w(x_dp, x_mask)
+
+        return mu, logw, x_mask

src/chatterbox/models/s3gen/matcha/transformer.py

@@ -0,0 +1,316 @@
+from typing import Any, Dict, Optional
+
+import torch
+import torch.nn as nn
+from diffusers.models.attention import (
+    GEGLU,
+    GELU,
+    AdaLayerNorm,
+    AdaLayerNormZero,
+    ApproximateGELU,
+)
+from diffusers.models.attention_processor import Attention
+from diffusers.models.lora import LoRACompatibleLinear
+from diffusers.utils.torch_utils import maybe_allow_in_graph
+
+
+class SnakeBeta(nn.Module):
+    """
+    A modified Snake function which uses separate parameters for the magnitude of the periodic components
+    Shape:
+        - Input: (B, C, T)
+        - Output: (B, C, T), same shape as the input
+    Parameters:
+        - alpha - trainable parameter that controls frequency
+        - beta - trainable parameter that controls magnitude
+    References:
+        - This activation function is a modified version based on this paper by Liu Ziyin, Tilman Hartwig, Masahito Ueda:
+        https://arxiv.org/abs/2006.08195
+    Examples:
+        >>> a1 = snakebeta(256)
+        >>> x = torch.randn(256)
+        >>> x = a1(x)
+    """
+
+    def __init__(self, in_features, out_features, alpha=1.0, alpha_trainable=True, alpha_logscale=True):
+        """
+        Initialization.
+        INPUT:
+            - in_features: shape of the input
+            - alpha - trainable parameter that controls frequency
+            - beta - trainable parameter that controls magnitude
+            alpha is initialized to 1 by default, higher values = higher-frequency.
+            beta is initialized to 1 by default, higher values = higher-magnitude.
+            alpha will be trained along with the rest of your model.
+        """
+        super().__init__()
+        self.in_features = out_features if isinstance(out_features, list) else [out_features]
+        self.proj = LoRACompatibleLinear(in_features, out_features)
+
+        # initialize alpha
+        self.alpha_logscale = alpha_logscale
+        if self.alpha_logscale:  # log scale alphas initialized to zeros
+            self.alpha = nn.Parameter(torch.zeros(self.in_features) * alpha)
+            self.beta = nn.Parameter(torch.zeros(self.in_features) * alpha)
+        else:  # linear scale alphas initialized to ones
+            self.alpha = nn.Parameter(torch.ones(self.in_features) * alpha)
+            self.beta = nn.Parameter(torch.ones(self.in_features) * alpha)
+
+        self.alpha.requires_grad = alpha_trainable
+        self.beta.requires_grad = alpha_trainable
+
+        self.no_div_by_zero = 0.000000001
+
+    def forward(self, x):
+        """
+        Forward pass of the function.
+        Applies the function to the input elementwise.
+        SnakeBeta ∶= x + 1/b * sin^2 (xa)
+        """
+        x = self.proj(x)
+        if self.alpha_logscale:
+            alpha = torch.exp(self.alpha)
+            beta = torch.exp(self.beta)
+        else:
+            alpha = self.alpha
+            beta = self.beta
+
+        x = x + (1.0 / (beta + self.no_div_by_zero)) * torch.pow(torch.sin(x * alpha), 2)
+
+        return x
+
+
+class FeedForward(nn.Module):
+    r"""
+    A feed-forward layer.
+
+    Parameters:
+        dim (`int`): The number of channels in the input.
+        dim_out (`int`, *optional*): The number of channels in the output. If not given, defaults to `dim`.
+        mult (`int`, *optional*, defaults to 4): The multiplier to use for the hidden dimension.
+        dropout (`float`, *optional*, defaults to 0.0): The dropout probability to use.
+        activation_fn (`str`, *optional*, defaults to `"geglu"`): Activation function to be used in feed-forward.
+        final_dropout (`bool` *optional*, defaults to False): Apply a final dropout.
+    """
+
+    def __init__(
+        self,
+        dim: int,
+        dim_out: Optional[int] = None,
+        mult: int = 4,
+        dropout: float = 0.0,
+        activation_fn: str = "geglu",
+        final_dropout: bool = False,
+    ):
+        super().__init__()
+        inner_dim = int(dim * mult)
+        dim_out = dim_out if dim_out is not None else dim
+
+        if activation_fn == "gelu":
+            act_fn = GELU(dim, inner_dim)
+        if activation_fn == "gelu-approximate":
+            act_fn = GELU(dim, inner_dim, approximate="tanh")
+        elif activation_fn == "geglu":
+            act_fn = GEGLU(dim, inner_dim)
+        elif activation_fn == "geglu-approximate":
+            act_fn = ApproximateGELU(dim, inner_dim)
+        elif activation_fn == "snakebeta":
+            act_fn = SnakeBeta(dim, inner_dim)
+
+        self.net = nn.ModuleList([])
+        # project in
+        self.net.append(act_fn)
+        # project dropout
+        self.net.append(nn.Dropout(dropout))
+        # project out
+        self.net.append(LoRACompatibleLinear(inner_dim, dim_out))
+        # FF as used in Vision Transformer, MLP-Mixer, etc. have a final dropout
+        if final_dropout:
+            self.net.append(nn.Dropout(dropout))
+
+    def forward(self, hidden_states):
+        for module in self.net:
+            hidden_states = module(hidden_states)
+        return hidden_states
+
+
+@maybe_allow_in_graph
+class BasicTransformerBlock(nn.Module):
+    r"""
+    A basic Transformer block.
+
+    Parameters:
+        dim (`int`): The number of channels in the input and output.
+        num_attention_heads (`int`): The number of heads to use for multi-head attention.
+        attention_head_dim (`int`): The number of channels in each head.
+        dropout (`float`, *optional*, defaults to 0.0): The dropout probability to use.
+        cross_attention_dim (`int`, *optional*): The size of the encoder_hidden_states vector for cross attention.
+        only_cross_attention (`bool`, *optional*):
+            Whether to use only cross-attention layers. In this case two cross attention layers are used.
+        double_self_attention (`bool`, *optional*):
+            Whether to use two self-attention layers. In this case no cross attention layers are used.
+        activation_fn (`str`, *optional*, defaults to `"geglu"`): Activation function to be used in feed-forward.
+        num_embeds_ada_norm (:
+            obj: `int`, *optional*): The number of diffusion steps used during training. See `Transformer2DModel`.
+        attention_bias (:
+            obj: `bool`, *optional*, defaults to `False`): Configure if the attentions should contain a bias parameter.
+    """
+
+    def __init__(
+        self,
+        dim: int,
+        num_attention_heads: int,
+        attention_head_dim: int,
+        dropout=0.0,
+        cross_attention_dim: Optional[int] = None,
+        activation_fn: str = "geglu",
+        num_embeds_ada_norm: Optional[int] = None,
+        attention_bias: bool = False,
+        only_cross_attention: bool = False,
+        double_self_attention: bool = False,
+        upcast_attention: bool = False,
+        norm_elementwise_affine: bool = True,
+        norm_type: str = "layer_norm",
+        final_dropout: bool = False,
+    ):
+        super().__init__()
+        self.only_cross_attention = only_cross_attention
+
+        self.use_ada_layer_norm_zero = (num_embeds_ada_norm is not None) and norm_type == "ada_norm_zero"
+        self.use_ada_layer_norm = (num_embeds_ada_norm is not None) and norm_type == "ada_norm"
+
+        if norm_type in ("ada_norm", "ada_norm_zero") and num_embeds_ada_norm is None:
+            raise ValueError(
+                f"`norm_type` is set to {norm_type}, but `num_embeds_ada_norm` is not defined. Please make sure to"
+                f" define `num_embeds_ada_norm` if setting `norm_type` to {norm_type}."
+            )
+
+        # Define 3 blocks. Each block has its own normalization layer.
+        # 1. Self-Attn
+        if self.use_ada_layer_norm:
+            self.norm1 = AdaLayerNorm(dim, num_embeds_ada_norm)
+        elif self.use_ada_layer_norm_zero:
+            self.norm1 = AdaLayerNormZero(dim, num_embeds_ada_norm)
+        else:
+            self.norm1 = nn.LayerNorm(dim, elementwise_affine=norm_elementwise_affine)
+        self.attn1 = Attention(
+            query_dim=dim,
+            heads=num_attention_heads,
+            dim_head=attention_head_dim,
+            dropout=dropout,
+            bias=attention_bias,
+            cross_attention_dim=cross_attention_dim if only_cross_attention else None,
+            upcast_attention=upcast_attention,
+        )
+
+        # 2. Cross-Attn
+        if cross_attention_dim is not None or double_self_attention:
+            # We currently only use AdaLayerNormZero for self attention where there will only be one attention block.
+            # I.e. the number of returned modulation chunks from AdaLayerZero would not make sense if returned during
+            # the second cross attention block.
+            self.norm2 = (
+                AdaLayerNorm(dim, num_embeds_ada_norm)
+                if self.use_ada_layer_norm
+                else nn.LayerNorm(dim, elementwise_affine=norm_elementwise_affine)
+            )
+            self.attn2 = Attention(
+                query_dim=dim,
+                cross_attention_dim=cross_attention_dim if not double_self_attention else None,
+                heads=num_attention_heads,
+                dim_head=attention_head_dim,
+                dropout=dropout,
+                bias=attention_bias,
+                upcast_attention=upcast_attention,
+                # scale_qk=False, # uncomment this to not to use flash attention
+            )  # is self-attn if encoder_hidden_states is none
+        else:
+            self.norm2 = None
+            self.attn2 = None
+
+        # 3. Feed-forward
+        self.norm3 = nn.LayerNorm(dim, elementwise_affine=norm_elementwise_affine)
+        self.ff = FeedForward(dim, dropout=dropout, activation_fn=activation_fn, final_dropout=final_dropout)
+
+        # let chunk size default to None
+        self._chunk_size = None
+        self._chunk_dim = 0
+
+    def set_chunk_feed_forward(self, chunk_size: Optional[int], dim: int):
+        # Sets chunk feed-forward
+        self._chunk_size = chunk_size
+        self._chunk_dim = dim
+
+    def forward(
+        self,
+        hidden_states: torch.FloatTensor,
+        attention_mask: Optional[torch.FloatTensor] = None,
+        encoder_hidden_states: Optional[torch.FloatTensor] = None,
+        encoder_attention_mask: Optional[torch.FloatTensor] = None,
+        timestep: Optional[torch.LongTensor] = None,
+        cross_attention_kwargs: Dict[str, Any] = None,
+        class_labels: Optional[torch.LongTensor] = None,
+    ):
+        # Notice that normalization is always applied before the real computation in the following blocks.
+        # 1. Self-Attention
+        if self.use_ada_layer_norm:
+            norm_hidden_states = self.norm1(hidden_states, timestep)
+        elif self.use_ada_layer_norm_zero:
+            norm_hidden_states, gate_msa, shift_mlp, scale_mlp, gate_mlp = self.norm1(
+                hidden_states, timestep, class_labels, hidden_dtype=hidden_states.dtype
+            )
+        else:
+            norm_hidden_states = self.norm1(hidden_states)
+
+        cross_attention_kwargs = cross_attention_kwargs if cross_attention_kwargs is not None else {}
+
+        attn_output = self.attn1(
+            norm_hidden_states,
+            encoder_hidden_states=encoder_hidden_states if self.only_cross_attention else None,
+            attention_mask=encoder_attention_mask if self.only_cross_attention else attention_mask,
+            **cross_attention_kwargs,
+        )
+        if self.use_ada_layer_norm_zero:
+            attn_output = gate_msa.unsqueeze(1) * attn_output
+        hidden_states = attn_output + hidden_states
+
+        # 2. Cross-Attention
+        if self.attn2 is not None:
+            norm_hidden_states = (
+                self.norm2(hidden_states, timestep) if self.use_ada_layer_norm else self.norm2(hidden_states)
+            )
+
+            attn_output = self.attn2(
+                norm_hidden_states,
+                encoder_hidden_states=encoder_hidden_states,
+                attention_mask=encoder_attention_mask,
+                **cross_attention_kwargs,
+            )
+            hidden_states = attn_output + hidden_states
+
+        # 3. Feed-forward
+        norm_hidden_states = self.norm3(hidden_states)
+
+        if self.use_ada_layer_norm_zero:
+            norm_hidden_states = norm_hidden_states * (1 + scale_mlp[:, None]) + shift_mlp[:, None]
+
+        if self._chunk_size is not None:
+            # "feed_forward_chunk_size" can be used to save memory
+            if norm_hidden_states.shape[self._chunk_dim] % self._chunk_size != 0:
+                raise ValueError(
+                    f"`hidden_states` dimension to be chunked: {norm_hidden_states.shape[self._chunk_dim]} has to be divisible by chunk size: {self._chunk_size}. Make sure to set an appropriate `chunk_size` when calling `unet.enable_forward_chunking`."
+                )
+
+            num_chunks = norm_hidden_states.shape[self._chunk_dim] // self._chunk_size
+            ff_output = torch.cat(
+                [self.ff(hid_slice) for hid_slice in norm_hidden_states.chunk(num_chunks, dim=self._chunk_dim)],
+                dim=self._chunk_dim,
+            )
+        else:
+            ff_output = self.ff(norm_hidden_states)
+
+        if self.use_ada_layer_norm_zero:
+            ff_output = gate_mlp.unsqueeze(1) * ff_output
+
+        hidden_states = ff_output + hidden_states
+
+        return hidden_states

src/chatterbox/models/s3gen/s3gen.py

@@ -0,0 +1,305 @@
+# Modified from CosyVoice https://github.com/FunAudioLLM/CosyVoice
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import logging
+
+import numpy as np
+import torch
+import torchaudio as ta
+from functools import lru_cache
+from typing import Optional
+from omegaconf import DictConfig
+
+from ..s3tokenizer import S3_SR, SPEECH_VOCAB_SIZE, S3Tokenizer
+from .const import S3GEN_SR
+from .flow import CausalMaskedDiffWithXvec
+from .xvector import CAMPPlus
+from .utils.mel import mel_spectrogram
+from .f0_predictor import ConvRNNF0Predictor
+from .hifigan import HiFTGenerator
+from .transformer.upsample_encoder import UpsampleConformerEncoder
+from .flow_matching import CausalConditionalCFM
+from .decoder import ConditionalDecoder
+
+
+def drop_invalid_tokens(x):
+    assert len(x.shape) <= 2 and x.shape[0] == 1, "only batch size of one allowed for now"
+    return x[x < SPEECH_VOCAB_SIZE]
+
+
+# TODO: global resampler cache
+@lru_cache(100)
+def get_resampler(src_sr, dst_sr, device):
+    return ta.transforms.Resample(src_sr, dst_sr).to(device)
+
+
+class S3Token2Mel(torch.nn.Module):
+    """
+    CosyVoice2's CFM decoder maps S3 speech tokens to mel-spectrograms.
+
+    TODO: make these modules configurable?
+    """
+    def __init__(self):
+        super().__init__()
+        self.tokenizer = S3Tokenizer("speech_tokenizer_v2_25hz")
+        self.mel_extractor = mel_spectrogram # TODO: make it a torch module?
+        self.speaker_encoder = CAMPPlus()  # use default args
+
+        encoder = UpsampleConformerEncoder(
+            output_size=512,
+            attention_heads=8,
+            linear_units=2048,
+            num_blocks=6,
+            dropout_rate=0.1,
+            positional_dropout_rate=0.1,
+            attention_dropout_rate=0.1,
+            normalize_before=True,
+            input_layer='linear',
+            pos_enc_layer_type='rel_pos_espnet',
+            selfattention_layer_type='rel_selfattn',
+            input_size=512,
+            use_cnn_module=False,
+            macaron_style=False,
+        )
+
+        estimator = ConditionalDecoder(
+            in_channels=320,
+            out_channels=80,
+            causal=True,
+            channels=[256],
+            dropout=0.0,
+            attention_head_dim=64,
+            n_blocks=4,
+            num_mid_blocks=12,
+            num_heads=8,
+            act_fn='gelu',
+        )
+        cfm_params = DictConfig({
+            "sigma_min": 1e-06,
+            "solver": 'euler',
+            "t_scheduler": 'cosine',
+            "training_cfg_rate": 0.2,
+            "inference_cfg_rate": 0.7,
+            "reg_loss_type": 'l1',
+        })
+        decoder = CausalConditionalCFM(
+            spk_emb_dim=80,
+            cfm_params=cfm_params,
+            estimator=estimator,
+        )
+
+        self.flow = CausalMaskedDiffWithXvec(
+            encoder=encoder,
+            decoder=decoder
+        )
+
+        self.resamplers = {}
+
+    @property
+    def device(self):
+        params = self.tokenizer.parameters()
+        return next(params).device
+
+    def embed_ref(
+        self,
+        ref_wav: torch.Tensor,
+        ref_sr: int,
+        device="auto",
+        ref_fade_out=True,
+    ):
+        device = self.device if device == "auto" else device
+        if isinstance(ref_wav, np.ndarray):
+            ref_wav = torch.from_numpy(ref_wav).float()
+
+        if ref_wav.device != device:
+            ref_wav = ref_wav.to(device)
+
+        if len(ref_wav.shape) == 1:
+            ref_wav = ref_wav.unsqueeze(0)  # (B, L)
+
+        if ref_wav.size(1) > 10 * ref_sr:
+            print("WARNING: cosydec received ref longer than 10s")
+
+        ref_wav_24 = ref_wav
+        if ref_sr != S3GEN_SR:
+            ref_wav_24 = get_resampler(ref_sr, S3GEN_SR, device)(ref_wav)
+
+        ref_mels_24 = self.mel_extractor(ref_wav_24).transpose(1, 2).to(device)
+        ref_mels_24_len = None
+
+        # Resample to 16kHz
+        ref_wav_16 = get_resampler(ref_sr, S3_SR, device)(ref_wav).to(device)
+
+        # Speaker embedding
+        ref_x_vector = self.speaker_encoder.inference(ref_wav_16)
+
+        # Tokenize 16khz reference
+        ref_speech_tokens, ref_speech_token_lens = self.tokenizer(ref_wav_16)
+
+        # Make sure mel_len = 2 * stoken_len (happens when the input is not padded to multiple of 40ms)
+        if ref_mels_24.shape[1] != 2 * ref_speech_tokens.shape[1]:
+            logging.warning(
+                "Reference mel length is not equal to 2 * reference token length.\n"
+            )
+            ref_speech_tokens = ref_speech_tokens[:, :ref_mels_24.shape[1] // 2]
+            ref_speech_token_lens[0] = ref_speech_tokens.shape[1]
+
+        return dict(
+            prompt_token=ref_speech_tokens.to(device),
+            prompt_token_len=ref_speech_token_lens,
+            prompt_feat=ref_mels_24,
+            prompt_feat_len=ref_mels_24_len,
+            embedding=ref_x_vector,
+        )
+
+    def forward(
+        self,
+        speech_tokens: torch.LongTensor,
+        # locally-computed ref embedding (mutex with ref_dict)
+        ref_wav: Optional[torch.Tensor],
+        ref_sr: Optional[int],
+        # pre-computed ref embedding (prod API)
+        ref_dict: Optional[dict] = None,
+        finalize: bool = False,
+    ):
+        """
+        Generate waveforms from S3 speech tokens and a reference waveform, which the speaker timbre is inferred from.
+
+        NOTE:
+        - The speaker encoder accepts 16 kHz waveform.
+        - S3TokenizerV2 accepts 16 kHz waveform.
+        - The mel-spectrogram for the reference assumes 24 kHz input signal.
+        - This function is designed for batch_size=1 only.
+
+        Args
+        ----
+        - `speech_tokens`: S3 speech tokens [B=1, T]
+        - `ref_wav`: reference waveform (`torch.Tensor` with shape=[B=1, T])
+        - `ref_sr`: reference sample rate
+        - `finalize`: whether streaming is finished or not. Note that if False, the last 3 tokens will be ignored.
+        """
+        assert (ref_wav is None) ^ (ref_dict is None), f"Must provide exactly one of ref_wav or ref_dict (got {ref_wav} and {ref_dict})"
+
+        if ref_dict is None:
+            ref_dict = self.embed_ref(ref_wav, ref_sr)
+        else:
+            # type/device casting (all values will be numpy if it's from a prod API call)
+            for rk in list(ref_dict):
+                if isinstance(ref_dict[rk], np.ndarray):
+                    ref_dict[rk] = torch.from_numpy(ref_dict[rk])
+                if torch.is_tensor(ref_dict[rk]):
+                    ref_dict[rk] = ref_dict[rk].to(self.device)
+
+        if len(speech_tokens.shape) == 1:
+            speech_tokens = speech_tokens.unsqueeze(0)
+
+        # assert speech_tokens.shape[0] == 1, "only batch size of one allowed for now"
+        speech_token_lens = torch.LongTensor([speech_tokens.size(1)]).to(self.device)
+
+        output_mels, _ = self.flow.inference(
+            token=speech_tokens,
+            token_len=speech_token_lens,
+            finalize=finalize,
+            **ref_dict,
+        )
+        return output_mels
+
+
+class S3Token2Wav(S3Token2Mel):
+    """
+    The decoder of CosyVoice2 is a concat of token-to-mel (CFM) and a mel-to-waveform (HiFiGAN) modules.
+
+    TODO: make these modules configurable?
+    """
+
+    def __init__(self):
+        super().__init__()
+
+        f0_predictor = ConvRNNF0Predictor()
+        self.mel2wav = HiFTGenerator(
+            sampling_rate=S3GEN_SR,
+            upsample_rates=[8, 5, 3],
+            upsample_kernel_sizes=[16, 11, 7],
+            source_resblock_kernel_sizes=[7, 7, 11],
+            source_resblock_dilation_sizes=[[1, 3, 5], [1, 3, 5], [1, 3, 5]],
+            f0_predictor=f0_predictor,
+        )
+
+        # silence out a few ms and fade audio in to reduce artifacts
+        n_trim = S3GEN_SR // 50  # 20ms = half of a frame
+        trim_fade = torch.zeros(2 * n_trim)
+        trim_fade[n_trim:] = (torch.cos(torch.linspace(torch.pi, 0, n_trim)) + 1) / 2
+        self.register_buffer("trim_fade", trim_fade, persistent=False) # (buffers get automatic device casting)
+
+    def forward(
+        self,
+        speech_tokens,
+        # locally-computed ref embedding (mutex with ref_dict)
+        ref_wav: Optional[torch.Tensor],
+        ref_sr: Optional[int],
+        # pre-computed ref embedding (prod API)
+        ref_dict: Optional[dict] = None,
+        finalize: bool = False
+    ):
+        output_mels = super().forward(speech_tokens, ref_wav=ref_wav, ref_sr=ref_sr, ref_dict=ref_dict, finalize=finalize)
+
+        # TODO jrm: ignoring the speed control (mel interpolation) and the HiFTGAN caching mechanisms for now.
+        hift_cache_source = torch.zeros(1, 1, 0).to(self.device)
+
+        output_wavs, *_ = self.mel2wav.inference(speech_feat=output_mels, cache_source=hift_cache_source)
+
+        if not self.training:
+            # NOTE: ad-hoc method to reduce "spillover" from the reference clip.
+            output_wavs[:, :len(self.trim_fade)] *= self.trim_fade
+
+        return output_wavs
+
+    @torch.inference_mode()
+    def flow_inference(
+        self,
+        speech_tokens,
+        # locally-computed ref embedding (mutex with ref_dict)
+        ref_wav: Optional[torch.Tensor] = None,
+        ref_sr: Optional[int] = None,
+        # pre-computed ref embedding (prod API)
+        ref_dict: Optional[dict] = None,
+        finalize: bool = False,
+    ):
+        return super().forward(speech_tokens, ref_wav=ref_wav, ref_sr=ref_sr, ref_dict=ref_dict, finalize=finalize)
+
+    @torch.inference_mode()
+    def hift_inference(self, speech_feat, cache_source: torch.Tensor = None):
+        if cache_source is None:
+            cache_source = torch.zeros(1, 1, 0).to(self.device)
+        return self.mel2wav.inference(speech_feat=speech_feat, cache_source=cache_source)
+
+    @torch.inference_mode()
+    def inference(
+        self,
+        speech_tokens,
+        # locally-computed ref embedding (mutex with ref_dict)
+        ref_wav: Optional[torch.Tensor] = None,
+        ref_sr: Optional[int] = None,
+        # pre-computed ref embedding (prod API)
+        ref_dict: Optional[dict] = None,
+        cache_source: torch.Tensor = None, # NOTE: this arg is for streaming, it can probably be removed here
+        finalize: bool = True,
+    ):
+        output_mels = self.flow_inference(speech_tokens, ref_wav=ref_wav, ref_sr=ref_sr, ref_dict=ref_dict, finalize=finalize)
+        output_wavs, output_sources = self.hift_inference(output_mels, cache_source)
+
+        # NOTE: ad-hoc method to reduce "spillover" from the reference clip.
+        output_wavs[:, :len(self.trim_fade)] *= self.trim_fade
+
+        return output_wavs, output_sources

src/chatterbox/models/s3gen/transformer/activation.py

@@ -0,0 +1,84 @@
+# Copyright (c) 2020 Johns Hopkins University (Shinji Watanabe)
+#               2020 Northwestern Polytechnical University (Pengcheng Guo)
+#               2020 Mobvoi Inc (Binbin Zhang)
+#               2024 Alibaba Inc (Xiang Lyu)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Swish() activation function for Conformer."""
+
+import torch
+from torch import nn, sin, pow
+from torch.nn import Parameter
+
+
+class Swish(torch.nn.Module):
+    """Construct an Swish object."""
+
+    def forward(self, x: torch.Tensor) -> torch.Tensor:
+        """Return Swish activation function."""
+        return x * torch.sigmoid(x)
+
+
+# Implementation adapted from https://github.com/EdwardDixon/snake under the MIT license.
+#   LICENSE is in incl_licenses directory.
+class Snake(nn.Module):
+    '''
+    Implementation of a sine-based periodic activation function
+    Shape:
+        - Input: (B, C, T)
+        - Output: (B, C, T), same shape as the input
+    Parameters:
+        - alpha - trainable parameter
+    References:
+        - This activation function is from this paper by Liu Ziyin, Tilman Hartwig, Masahito Ueda:
+        https://arxiv.org/abs/2006.08195
+    Examples:
+        >>> a1 = snake(256)
+        >>> x = torch.randn(256)
+        >>> x = a1(x)
+    '''
+    def __init__(self, in_features, alpha=1.0, alpha_trainable=True, alpha_logscale=False):
+        '''
+        Initialization.
+        INPUT:
+            - in_features: shape of the input
+            - alpha: trainable parameter
+            alpha is initialized to 1 by default, higher values = higher-frequency.
+            alpha will be trained along with the rest of your model.
+        '''
+        super(Snake, self).__init__()
+        self.in_features = in_features
+
+        # initialize alpha
+        self.alpha_logscale = alpha_logscale
+        if self.alpha_logscale:  # log scale alphas initialized to zeros
+            self.alpha = Parameter(torch.zeros(in_features) * alpha)
+        else:  # linear scale alphas initialized to ones
+            self.alpha = Parameter(torch.ones(in_features) * alpha)
+
+        self.alpha.requires_grad = alpha_trainable
+
+        self.no_div_by_zero = 0.000000001
+
+    def forward(self, x):
+        '''
+        Forward pass of the function.
+        Applies the function to the input elementwise.
+        Snake ∶= x + 1/a * sin^2 (xa)
+        '''
+        alpha = self.alpha.unsqueeze(0).unsqueeze(-1)  # line up with x to [B, C, T]
+        if self.alpha_logscale:
+            alpha = torch.exp(alpha)
+        x = x + (1.0 / (alpha + self.no_div_by_zero)) * pow(sin(x * alpha), 2)
+
+        return x

src/chatterbox/models/s3gen/transformer/attention.py

@@ -0,0 +1,330 @@
+# Copyright (c) 2019 Shigeki Karita
+#               2020 Mobvoi Inc (Binbin Zhang)
+#               2022 Xingchen Song (sxc19@mails.tsinghua.edu.cn)
+#               2024 Alibaba Inc (Xiang Lyu)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Multi-Head Attention layer definition."""
+
+import math
+from typing import Tuple
+
+import torch
+from torch import nn
+
+
+class MultiHeadedAttention(nn.Module):
+    """Multi-Head Attention layer.
+
+    Args:
+        n_head (int): The number of heads.
+        n_feat (int): The number of features.
+        dropout_rate (float): Dropout rate.
+
+    """
+
+    def __init__(self,
+                 n_head: int,
+                 n_feat: int,
+                 dropout_rate: float,
+                 key_bias: bool = True):
+        """Construct an MultiHeadedAttention object."""
+        super().__init__()
+        assert n_feat % n_head == 0
+        # We assume d_v always equals d_k
+        self.d_k = n_feat // n_head
+        self.h = n_head
+        self.linear_q = nn.Linear(n_feat, n_feat)
+        self.linear_k = nn.Linear(n_feat, n_feat, bias=key_bias)
+        self.linear_v = nn.Linear(n_feat, n_feat)
+        self.linear_out = nn.Linear(n_feat, n_feat)
+        self.dropout = nn.Dropout(p=dropout_rate)
+
+    def forward_qkv(
+        self, query: torch.Tensor, key: torch.Tensor, value: torch.Tensor
+    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
+        """Transform query, key and value.
+
+        Args:
+            query (torch.Tensor): Query tensor (#batch, time1, size).
+            key (torch.Tensor): Key tensor (#batch, time2, size).
+            value (torch.Tensor): Value tensor (#batch, time2, size).
+
+        Returns:
+            torch.Tensor: Transformed query tensor, size
+                (#batch, n_head, time1, d_k).
+            torch.Tensor: Transformed key tensor, size
+                (#batch, n_head, time2, d_k).
+            torch.Tensor: Transformed value tensor, size
+                (#batch, n_head, time2, d_k).
+
+        """
+        n_batch = query.size(0)
+        q = self.linear_q(query).view(n_batch, -1, self.h, self.d_k)
+        k = self.linear_k(key).view(n_batch, -1, self.h, self.d_k)
+        v = self.linear_v(value).view(n_batch, -1, self.h, self.d_k)
+        q = q.transpose(1, 2)  # (batch, head, time1, d_k)
+        k = k.transpose(1, 2)  # (batch, head, time2, d_k)
+        v = v.transpose(1, 2)  # (batch, head, time2, d_k)
+
+        return q, k, v
+
+    def forward_attention(
+        self,
+        value: torch.Tensor,
+        scores: torch.Tensor,
+        mask: torch.Tensor = torch.ones((0, 0, 0), dtype=torch.bool)
+    ) -> torch.Tensor:
+        """Compute attention context vector.
+
+        Args:
+            value (torch.Tensor): Transformed value, size
+                (#batch, n_head, time2, d_k).
+            scores (torch.Tensor): Attention score, size
+                (#batch, n_head, time1, time2).
+            mask (torch.Tensor): Mask, size (#batch, 1, time2) or
+                (#batch, time1, time2), (0, 0, 0) means fake mask.
+
+        Returns:
+            torch.Tensor: Transformed value (#batch, time1, d_model)
+                weighted by the attention score (#batch, time1, time2).
+
+        """
+        n_batch = value.size(0)
+        # NOTE(xcsong): When will `if mask.size(2) > 0` be True?
+        #   1. onnx(16/4) [WHY? Because we feed real cache & real mask for the
+        #           1st chunk to ease the onnx export.]
+        #   2. pytorch training
+        if mask.size(2) > 0:  # time2 > 0
+            mask = mask.unsqueeze(1).eq(0)  # (batch, 1, *, time2)
+            # For last chunk, time2 might be larger than scores.size(-1)
+            mask = mask[:, :, :, :scores.size(-1)]  # (batch, 1, *, time2)
+            scores = scores.masked_fill(mask, -float('inf'))
+            attn = torch.softmax(scores, dim=-1).masked_fill(
+                mask, 0.0)  # (batch, head, time1, time2)
+        # NOTE(xcsong): When will `if mask.size(2) > 0` be False?
+        #   1. onnx(16/-1, -1/-1, 16/0)
+        #   2. jit (16/-1, -1/-1, 16/0, 16/4)
+        else:
+            attn = torch.softmax(scores, dim=-1)  # (batch, head, time1, time2)
+
+        p_attn = self.dropout(attn)
+        x = torch.matmul(p_attn, value)  # (batch, head, time1, d_k)
+        x = (x.transpose(1, 2).contiguous().view(n_batch, -1,
+                                                 self.h * self.d_k)
+             )  # (batch, time1, d_model)
+
+        return self.linear_out(x)  # (batch, time1, d_model)
+
+    def forward(
+        self,
+        query: torch.Tensor,
+        key: torch.Tensor,
+        value: torch.Tensor,
+        mask: torch.Tensor = torch.ones((0, 0, 0), dtype=torch.bool),
+        pos_emb: torch.Tensor = torch.empty(0),
+        cache: torch.Tensor = torch.zeros((0, 0, 0, 0))
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        """Compute scaled dot product attention.
+
+        Args:
+            query (torch.Tensor): Query tensor (#batch, time1, size).
+            key (torch.Tensor): Key tensor (#batch, time2, size).
+            value (torch.Tensor): Value tensor (#batch, time2, size).
+            mask (torch.Tensor): Mask tensor (#batch, 1, time2) or
+                (#batch, time1, time2).
+                1.When applying cross attention between decoder and encoder,
+                the batch padding mask for input is in (#batch, 1, T) shape.
+                2.When applying self attention of encoder,
+                the mask is in (#batch, T, T)  shape.
+                3.When applying self attention of decoder,
+                the mask is in (#batch, L, L)  shape.
+                4.If the different position in decoder see different block
+                of the encoder, such as Mocha, the passed in mask could be
+                in (#batch, L, T) shape. But there is no such case in current
+                CosyVoice.
+            cache (torch.Tensor): Cache tensor (1, head, cache_t, d_k * 2),
+                where `cache_t == chunk_size * num_decoding_left_chunks`
+                and `head * d_k == size`
+
+
+        Returns:
+            torch.Tensor: Output tensor (#batch, time1, d_model).
+            torch.Tensor: Cache tensor (1, head, cache_t + time1, d_k * 2)
+                where `cache_t == chunk_size * num_decoding_left_chunks`
+                and `head * d_k == size`
+
+        """
+        q, k, v = self.forward_qkv(query, key, value)
+
+        # NOTE(xcsong):
+        #   when export onnx model, for 1st chunk, we feed
+        #       cache(1, head, 0, d_k * 2) (16/-1, -1/-1, 16/0 mode)
+        #       or cache(1, head, real_cache_t, d_k * 2) (16/4 mode).
+        #       In all modes, `if cache.size(0) > 0` will alwayse be `True`
+        #       and we will always do splitting and
+        #       concatnation(this will simplify onnx export). Note that
+        #       it's OK to concat & split zero-shaped tensors(see code below).
+        #   when export jit  model, for 1st chunk, we always feed
+        #       cache(0, 0, 0, 0) since jit supports dynamic if-branch.
+        # >>> a = torch.ones((1, 2, 0, 4))
+        # >>> b = torch.ones((1, 2, 3, 4))
+        # >>> c = torch.cat((a, b), dim=2)
+        # >>> torch.equal(b, c)        # True
+        # >>> d = torch.split(a, 2, dim=-1)
+        # >>> torch.equal(d[0], d[1])  # True
+        if cache.size(0) > 0:
+            key_cache, value_cache = torch.split(cache,
+                                                 cache.size(-1) // 2,
+                                                 dim=-1)
+            k = torch.cat([key_cache, k], dim=2)
+            v = torch.cat([value_cache, v], dim=2)
+        # NOTE(xcsong): We do cache slicing in encoder.forward_chunk, since it's
+        #   non-trivial to calculate `next_cache_start` here.
+        new_cache = torch.cat((k, v), dim=-1)
+
+        scores = torch.matmul(q, k.transpose(-2, -1)) / math.sqrt(self.d_k)
+        return self.forward_attention(v, scores, mask), new_cache
+
+
+class RelPositionMultiHeadedAttention(MultiHeadedAttention):
+    """Multi-Head Attention layer with relative position encoding.
+    Paper: https://arxiv.org/abs/1901.02860
+    Args:
+        n_head (int): The number of heads.
+        n_feat (int): The number of features.
+        dropout_rate (float): Dropout rate.
+    """
+
+    def __init__(self,
+                 n_head: int,
+                 n_feat: int,
+                 dropout_rate: float,
+                 key_bias: bool = True):
+        """Construct an RelPositionMultiHeadedAttention object."""
+        super().__init__(n_head, n_feat, dropout_rate, key_bias)
+        # linear transformation for positional encoding
+        self.linear_pos = nn.Linear(n_feat, n_feat, bias=False)
+        # these two learnable bias are used in matrix c and matrix d
+        # as described in https://arxiv.org/abs/1901.02860 Section 3.3
+        self.pos_bias_u = nn.Parameter(torch.Tensor(self.h, self.d_k))
+        self.pos_bias_v = nn.Parameter(torch.Tensor(self.h, self.d_k))
+        torch.nn.init.xavier_uniform_(self.pos_bias_u)
+        torch.nn.init.xavier_uniform_(self.pos_bias_v)
+
+    def rel_shift(self, x: torch.Tensor) -> torch.Tensor:
+        """Compute relative positional encoding.
+
+        Args:
+            x (torch.Tensor): Input tensor (batch, head, time1, 2*time1-1).
+            time1 means the length of query vector.
+
+        Returns:
+            torch.Tensor: Output tensor.
+
+        """
+        zero_pad = torch.zeros((x.size()[0], x.size()[1], x.size()[2], 1),
+                               device=x.device,
+                               dtype=x.dtype)
+        x_padded = torch.cat([zero_pad, x], dim=-1)
+
+        x_padded = x_padded.view(x.size()[0],
+                                 x.size()[1],
+                                 x.size(3) + 1, x.size(2))
+        x = x_padded[:, :, 1:].view_as(x)[
+            :, :, :, : x.size(-1) // 2 + 1
+        ]  # only keep the positions from 0 to time2
+        return x
+
+    def forward(
+        self,
+        query: torch.Tensor,
+        key: torch.Tensor,
+        value: torch.Tensor,
+        mask: torch.Tensor = torch.ones((0, 0, 0), dtype=torch.bool),
+        pos_emb: torch.Tensor = torch.empty(0),
+        cache: torch.Tensor = torch.zeros((0, 0, 0, 0))
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        """Compute 'Scaled Dot Product Attention' with rel. positional encoding.
+        Args:
+            query (torch.Tensor): Query tensor (#batch, time1, size).
+            key (torch.Tensor): Key tensor (#batch, time2, size).
+            value (torch.Tensor): Value tensor (#batch, time2, size).
+            mask (torch.Tensor): Mask tensor (#batch, 1, time2) or
+                (#batch, time1, time2), (0, 0, 0) means fake mask.
+            pos_emb (torch.Tensor): Positional embedding tensor
+                (#batch, time2, size).
+            cache (torch.Tensor): Cache tensor (1, head, cache_t, d_k * 2),
+                where `cache_t == chunk_size * num_decoding_left_chunks`
+                and `head * d_k == size`
+        Returns:
+            torch.Tensor: Output tensor (#batch, time1, d_model).
+            torch.Tensor: Cache tensor (1, head, cache_t + time1, d_k * 2)
+                where `cache_t == chunk_size * num_decoding_left_chunks`
+                and `head * d_k == size`
+        """
+        q, k, v = self.forward_qkv(query, key, value)
+        q = q.transpose(1, 2)  # (batch, time1, head, d_k)
+
+        # NOTE(xcsong):
+        #   when export onnx model, for 1st chunk, we feed
+        #       cache(1, head, 0, d_k * 2) (16/-1, -1/-1, 16/0 mode)
+        #       or cache(1, head, real_cache_t, d_k * 2) (16/4 mode).
+        #       In all modes, `if cache.size(0) > 0` will alwayse be `True`
+        #       and we will always do splitting and
+        #       concatnation(this will simplify onnx export). Note that
+        #       it's OK to concat & split zero-shaped tensors(see code below).
+        #   when export jit  model, for 1st chunk, we always feed
+        #       cache(0, 0, 0, 0) since jit supports dynamic if-branch.
+        # >>> a = torch.ones((1, 2, 0, 4))
+        # >>> b = torch.ones((1, 2, 3, 4))
+        # >>> c = torch.cat((a, b), dim=2)
+        # >>> torch.equal(b, c)        # True
+        # >>> d = torch.split(a, 2, dim=-1)
+        # >>> torch.equal(d[0], d[1])  # True
+        if cache.size(0) > 0:
+            key_cache, value_cache = torch.split(cache,
+                                                 cache.size(-1) // 2,
+                                                 dim=-1)
+            k = torch.cat([key_cache, k], dim=2)
+            v = torch.cat([value_cache, v], dim=2)
+        # NOTE(xcsong): We do cache slicing in encoder.forward_chunk, since it's
+        #   non-trivial to calculate `next_cache_start` here.
+        new_cache = torch.cat((k, v), dim=-1)
+
+        n_batch_pos = pos_emb.size(0)
+        p = self.linear_pos(pos_emb).view(n_batch_pos, -1, self.h, self.d_k)
+        p = p.transpose(1, 2)  # (batch, head, time1, d_k)
+
+        # (batch, head, time1, d_k)
+        q_with_bias_u = (q + self.pos_bias_u.to(q.device)).transpose(1, 2)
+        # (batch, head, time1, d_k)
+        q_with_bias_v = (q + self.pos_bias_v.to(q.device)).transpose(1, 2)
+
+        # compute attention score
+        # first compute matrix a and matrix c
+        # as described in https://arxiv.org/abs/1901.02860 Section 3.3
+        # (batch, head, time1, time2)
+        matrix_ac = torch.matmul(q_with_bias_u, k.transpose(-2, -1))
+
+        # compute matrix b and matrix d
+        # (batch, head, time1, time2)
+        matrix_bd = torch.matmul(q_with_bias_v, p.transpose(-2, -1))
+        # NOTE(Xiang Lyu): Keep rel_shift since espnet rel_pos_emb is used
+        if matrix_ac.shape != matrix_bd.shape:
+            matrix_bd = self.rel_shift(matrix_bd)
+
+        scores = (matrix_ac + matrix_bd) / math.sqrt(
+            self.d_k)  # (batch, head, time1, time2)
+
+        return self.forward_attention(v, scores, mask), new_cache

src/chatterbox/models/s3gen/transformer/convolution.py

@@ -0,0 +1,145 @@
+# Copyright (c) 2020 Mobvoi Inc. (authors: Binbin Zhang, Di Wu)
+#               2024 Alibaba Inc (Xiang Lyu)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# Modified from ESPnet(https://github.com/espnet/espnet)
+"""ConvolutionModule definition."""
+
+from typing import Tuple
+
+import torch
+from torch import nn
+
+
+class ConvolutionModule(nn.Module):
+    """ConvolutionModule in Conformer model."""
+
+    def __init__(self,
+                 channels: int,
+                 kernel_size: int = 15,
+                 activation: nn.Module = nn.ReLU(),
+                 norm: str = "batch_norm",
+                 causal: bool = False,
+                 bias: bool = True):
+        """Construct an ConvolutionModule object.
+        Args:
+            channels (int): The number of channels of conv layers.
+            kernel_size (int): Kernel size of conv layers.
+            causal (int): Whether use causal convolution or not
+        """
+        super().__init__()
+
+        self.pointwise_conv1 = nn.Conv1d(
+            channels,
+            2 * channels,
+            kernel_size=1,
+            stride=1,
+            padding=0,
+            bias=bias,
+        )
+        # self.lorder is used to distinguish if it's a causal convolution,
+        # if self.lorder > 0: it's a causal convolution, the input will be
+        #    padded with self.lorder frames on the left in forward.
+        # else: it's a symmetrical convolution
+        if causal:
+            padding = 0
+            self.lorder = kernel_size - 1
+        else:
+            # kernel_size should be an odd number for none causal convolution
+            assert (kernel_size - 1) % 2 == 0
+            padding = (kernel_size - 1) // 2
+            self.lorder = 0
+        self.depthwise_conv = nn.Conv1d(
+            channels,
+            channels,
+            kernel_size,
+            stride=1,
+            padding=padding,
+            groups=channels,
+            bias=bias,
+        )
+
+        assert norm in ['batch_norm', 'layer_norm']
+        if norm == "batch_norm":
+            self.use_layer_norm = False
+            self.norm = nn.BatchNorm1d(channels)
+        else:
+            self.use_layer_norm = True
+            self.norm = nn.LayerNorm(channels)
+
+        self.pointwise_conv2 = nn.Conv1d(
+            channels,
+            channels,
+            kernel_size=1,
+            stride=1,
+            padding=0,
+            bias=bias,
+        )
+        self.activation = activation
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        mask_pad: torch.Tensor = torch.ones((0, 0, 0), dtype=torch.bool),
+        cache: torch.Tensor = torch.zeros((0, 0, 0)),
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        """Compute convolution module.
+        Args:
+            x (torch.Tensor): Input tensor (#batch, time, channels).
+            mask_pad (torch.Tensor): used for batch padding (#batch, 1, time),
+                (0, 0, 0) means fake mask.
+            cache (torch.Tensor): left context cache, it is only
+                used in causal convolution (#batch, channels, cache_t),
+                (0, 0, 0) meas fake cache.
+        Returns:
+            torch.Tensor: Output tensor (#batch, time, channels).
+        """
+        # exchange the temporal dimension and the feature dimension
+        x = x.transpose(1, 2)  # (#batch, channels, time)
+
+        # mask batch padding
+        if mask_pad.size(2) > 0:  # time > 0
+            x.masked_fill_(~mask_pad, 0.0)
+
+        if self.lorder > 0:
+            if cache.size(2) == 0:  # cache_t == 0
+                x = nn.functional.pad(x, (self.lorder, 0), 'constant', 0.0)
+            else:
+                assert cache.size(0) == x.size(0)  # equal batch
+                assert cache.size(1) == x.size(1)  # equal channel
+                x = torch.cat((cache, x), dim=2)
+            assert (x.size(2) > self.lorder)
+            new_cache = x[:, :, -self.lorder:]
+        else:
+            # It's better we just return None if no cache is required,
+            # However, for JIT export, here we just fake one tensor instead of
+            # None.
+            new_cache = torch.zeros((0, 0, 0), dtype=x.dtype, device=x.device)
+
+        # GLU mechanism
+        x = self.pointwise_conv1(x)  # (batch, 2*channel, dim)
+        x = nn.functional.glu(x, dim=1)  # (batch, channel, dim)
+
+        # 1D Depthwise Conv
+        x = self.depthwise_conv(x)
+        if self.use_layer_norm:
+            x = x.transpose(1, 2)
+        x = self.activation(self.norm(x))
+        if self.use_layer_norm:
+            x = x.transpose(1, 2)
+        x = self.pointwise_conv2(x)
+        # mask batch padding
+        if mask_pad.size(2) > 0:  # time > 0
+            x.masked_fill_(~mask_pad, 0.0)
+
+        return x.transpose(1, 2), new_cache

src/chatterbox/models/s3gen/transformer/embedding.py

@@ -0,0 +1,294 @@
+# Copyright (c) 2020 Mobvoi Inc. (authors: Binbin Zhang, Di Wu)
+#               2024 Alibaba Inc (Xiang Lyu)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# Modified from ESPnet(https://github.com/espnet/espnet)
+"""Positonal Encoding Module."""
+
+import math
+from typing import Tuple, Union
+
+import torch
+import torch.nn.functional as F
+import numpy as np
+
+
+class PositionalEncoding(torch.nn.Module):
+    """Positional encoding.
+
+    :param int d_model: embedding dim
+    :param float dropout_rate: dropout rate
+    :param int max_len: maximum input length
+
+    PE(pos, 2i)   = sin(pos/(10000^(2i/dmodel)))
+    PE(pos, 2i+1) = cos(pos/(10000^(2i/dmodel)))
+    """
+
+    def __init__(self,
+                 d_model: int,
+                 dropout_rate: float,
+                 max_len: int = 5000,
+                 reverse: bool = False):
+        """Construct an PositionalEncoding object."""
+        super().__init__()
+        self.d_model = d_model
+        self.xscale = math.sqrt(self.d_model)
+        self.dropout = torch.nn.Dropout(p=dropout_rate)
+        self.max_len = max_len
+
+        self.pe = torch.zeros(self.max_len, self.d_model)
+        position = torch.arange(0, self.max_len,
+                                dtype=torch.float32).unsqueeze(1)
+        div_term = torch.exp(
+            torch.arange(0, self.d_model, 2, dtype=torch.float32) *
+            -(math.log(10000.0) / self.d_model))
+        self.pe[:, 0::2] = torch.sin(position * div_term)
+        self.pe[:, 1::2] = torch.cos(position * div_term)
+        self.pe = self.pe.unsqueeze(0)
+
+    def forward(self,
+                x: torch.Tensor,
+                offset: Union[int, torch.Tensor] = 0) \
+            -> Tuple[torch.Tensor, torch.Tensor]:
+        """Add positional encoding.
+
+        Args:
+            x (torch.Tensor): Input. Its shape is (batch, time, ...)
+            offset (int, torch.tensor): position offset
+
+        Returns:
+            torch.Tensor: Encoded tensor. Its shape is (batch, time, ...)
+            torch.Tensor: for compatibility to RelPositionalEncoding
+        """
+
+        self.pe = self.pe.to(x.device)
+        pos_emb = self.position_encoding(offset, x.size(1), False)
+        x = x * self.xscale + pos_emb
+        return self.dropout(x), self.dropout(pos_emb)
+
+    def position_encoding(self,
+                          offset: Union[int, torch.Tensor],
+                          size: int,
+                          apply_dropout: bool = True) -> torch.Tensor:
+        """ For getting encoding in a streaming fashion
+
+        Attention!!!!!
+        we apply dropout only once at the whole utterance level in a none
+        streaming way, but will call this function several times with
+        increasing input size in a streaming scenario, so the dropout will
+        be applied several times.
+
+        Args:
+            offset (int or torch.tensor): start offset
+            size (int): required size of position encoding
+
+        Returns:
+            torch.Tensor: Corresponding encoding
+        """
+        # How to subscript a Union type:
+        #   https://github.com/pytorch/pytorch/issues/69434
+        if isinstance(offset, int):
+            assert offset + size <= self.max_len
+            pos_emb = self.pe[:, offset:offset + size]
+        elif isinstance(offset, torch.Tensor) and offset.dim() == 0:  # scalar
+            assert offset + size <= self.max_len
+            pos_emb = self.pe[:, offset:offset + size]
+        else:  # for batched streaming decoding on GPU
+            assert torch.max(offset) + size <= self.max_len
+            index = offset.unsqueeze(1) + \
+                torch.arange(0, size).to(offset.device)  # B X T
+            flag = index > 0
+            # remove negative offset
+            index = index * flag
+            pos_emb = F.embedding(index, self.pe[0])  # B X T X d_model
+
+        if apply_dropout:
+            pos_emb = self.dropout(pos_emb)
+        return pos_emb
+
+
+class RelPositionalEncoding(PositionalEncoding):
+    """Relative positional encoding module.
+    See : Appendix B in https://arxiv.org/abs/1901.02860
+    Args:
+        d_model (int): Embedding dimension.
+        dropout_rate (float): Dropout rate.
+        max_len (int): Maximum input length.
+    """
+
+    def __init__(self, d_model: int, dropout_rate: float, max_len: int = 5000):
+        """Initialize class."""
+        super().__init__(d_model, dropout_rate, max_len, reverse=True)
+
+    def forward(self,
+                x: torch.Tensor,
+                offset: Union[int, torch.Tensor] = 0) \
+            -> Tuple[torch.Tensor, torch.Tensor]:
+        """Compute positional encoding.
+        Args:
+            x (torch.Tensor): Input tensor (batch, time, `*`).
+        Returns:
+            torch.Tensor: Encoded tensor (batch, time, `*`).
+            torch.Tensor: Positional embedding tensor (1, time, `*`).
+        """
+        self.pe = self.pe.to(x.device)
+        x = x * self.xscale
+        pos_emb = self.position_encoding(offset, x.size(1), False)
+        return self.dropout(x), self.dropout(pos_emb)
+
+
+class WhisperPositionalEncoding(PositionalEncoding):
+    """ Sinusoids position encoding used in openai-whisper.encoder
+    """
+
+    def __init__(self, d_model: int, dropout_rate: float, max_len: int = 1500):
+        super().__init__(d_model, dropout_rate, max_len)
+        self.xscale = 1.0
+        log_timescale_increment = np.log(10000) / (d_model // 2 - 1)
+        inv_timescales = torch.exp(-log_timescale_increment *
+                                   torch.arange(d_model // 2))
+        scaled_time = torch.arange(max_len)[:, np.newaxis] * \
+            inv_timescales[np.newaxis, :]
+        pe = torch.cat([torch.sin(scaled_time), torch.cos(scaled_time)], dim=1)
+        delattr(self, "pe")
+        self.register_buffer("pe", pe.unsqueeze(0))
+
+
+class LearnablePositionalEncoding(PositionalEncoding):
+    """ Learnable position encoding used in openai-whisper.decoder
+    """
+
+    def __init__(self, d_model: int, dropout_rate: float, max_len: int = 448):
+        super().__init__(d_model, dropout_rate, max_len)
+        # NOTE(xcsong): overwrite self.pe & self.xscale
+        self.pe = torch.nn.Parameter(torch.empty(1, max_len, d_model))
+        self.xscale = 1.0
+
+
+class NoPositionalEncoding(torch.nn.Module):
+    """ No position encoding
+    """
+
+    def __init__(self, d_model: int, dropout_rate: float):
+        super().__init__()
+        self.d_model = d_model
+        self.dropout = torch.nn.Dropout(p=dropout_rate)
+
+    def forward(self,
+                x: torch.Tensor,
+                offset: Union[int, torch.Tensor] = 0) \
+            -> Tuple[torch.Tensor, torch.Tensor]:
+        """ Just return zero vector for interface compatibility
+        """
+        pos_emb = torch.zeros(1, x.size(1), self.d_model).to(x.device)
+        return self.dropout(x), pos_emb
+
+    def position_encoding(self, offset: Union[int, torch.Tensor],
+                          size: int) -> torch.Tensor:
+        return torch.zeros(1, size, self.d_model)
+
+
+class EspnetRelPositionalEncoding(torch.nn.Module):
+    """Relative positional encoding module (new implementation).
+
+    Details can be found in https://github.com/espnet/espnet/pull/2816.
+
+    See : Appendix B in https://arxiv.org/abs/1901.02860
+
+    Args:
+        d_model (int): Embedding dimension.
+        dropout_rate (float): Dropout rate.
+        max_len (int): Maximum input length.
+
+    """
+
+    def __init__(self, d_model: int, dropout_rate: float, max_len: int = 5000):
+        """Construct an PositionalEncoding object."""
+        super(EspnetRelPositionalEncoding, self).__init__()
+        self.d_model = d_model
+        self.xscale = math.sqrt(self.d_model)
+        self.dropout = torch.nn.Dropout(p=dropout_rate)
+        self.pe = None
+        self.extend_pe(torch.tensor(0.0).expand(1, max_len))
+
+    def extend_pe(self, x: torch.Tensor):
+        """Reset the positional encodings."""
+        if self.pe is not None:
+            # self.pe contains both positive and negative parts
+            # the length of self.pe is 2 * input_len - 1
+            if self.pe.size(1) >= x.size(1) * 2 - 1:
+                if self.pe.dtype != x.dtype or self.pe.device != x.device:
+                    self.pe = self.pe.to(dtype=x.dtype, device=x.device)
+                return
+        # Suppose `i` means to the position of query vecotr and `j` means the
+        # position of key vector. We use position relative positions when keys
+        # are to the left (i>j) and negative relative positions otherwise (i<j).
+        pe_positive = torch.zeros(x.size(1), self.d_model)
+        pe_negative = torch.zeros(x.size(1), self.d_model)
+        position = torch.arange(0, x.size(1), dtype=torch.float32).unsqueeze(1)
+        div_term = torch.exp(
+            torch.arange(0, self.d_model, 2, dtype=torch.float32)
+            * -(math.log(10000.0) / self.d_model)
+        )
+        pe_positive[:, 0::2] = torch.sin(position * div_term)
+        pe_positive[:, 1::2] = torch.cos(position * div_term)
+        pe_negative[:, 0::2] = torch.sin(-1 * position * div_term)
+        pe_negative[:, 1::2] = torch.cos(-1 * position * div_term)
+
+        # Reserve the order of positive indices and concat both positive and
+        # negative indices. This is used to support the shifting trick
+        # as in https://arxiv.org/abs/1901.02860
+        pe_positive = torch.flip(pe_positive, [0]).unsqueeze(0)
+        pe_negative = pe_negative[1:].unsqueeze(0)
+        pe = torch.cat([pe_positive, pe_negative], dim=1)
+        self.pe = pe.to(device=x.device, dtype=x.dtype)
+
+    def forward(self, x: torch.Tensor, offset: Union[int, torch.Tensor] = 0) \
+            -> Tuple[torch.Tensor, torch.Tensor]:
+        """Add positional encoding.
+
+        Args:
+            x (torch.Tensor): Input tensor (batch, time, `*`).
+
+        Returns:
+            torch.Tensor: Encoded tensor (batch, time, `*`).
+
+        """
+        self.extend_pe(x)
+        x = x * self.xscale
+        pos_emb = self.position_encoding(size=x.size(1), offset=offset)
+        return self.dropout(x), self.dropout(pos_emb)
+
+    def position_encoding(self,
+                          offset: Union[int, torch.Tensor],
+                          size: int) -> torch.Tensor:
+        """ For getting encoding in a streaming fashion
+
+        Attention!!!!!
+        we apply dropout only once at the whole utterance level in a none
+        streaming way, but will call this function several times with
+        increasing input size in a streaming scenario, so the dropout will
+        be applied several times.
+
+        Args:
+            offset (int or torch.tensor): start offset
+            size (int): required size of position encoding
+
+        Returns:
+            torch.Tensor: Corresponding encoding
+        """
+        pos_emb = self.pe[
+            :,
+            self.pe.size(1) // 2 - size + 1: self.pe.size(1) // 2 + size,
+        ]
+        return pos_emb

src/chatterbox/models/s3gen/transformer/encoder_layer.py

@@ -0,0 +1,236 @@
+# Copyright (c) 2021 Mobvoi Inc (Binbin Zhang, Di Wu)
+#               2022 Xingchen Song (sxc19@mails.tsinghua.edu.cn)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# Modified from ESPnet(https://github.com/espnet/espnet)
+"""Encoder self-attention layer definition."""
+
+from typing import Optional, Tuple
+
+import torch
+from torch import nn
+
+
+class TransformerEncoderLayer(nn.Module):
+    """Encoder layer module.
+
+    Args:
+        size (int): Input dimension.
+        self_attn (torch.nn.Module): Self-attention module instance.
+            `MultiHeadedAttention` or `RelPositionMultiHeadedAttention`
+            instance can be used as the argument.
+        feed_forward (torch.nn.Module): Feed-forward module instance.
+            `PositionwiseFeedForward`, instance can be used as the argument.
+        dropout_rate (float): Dropout rate.
+        normalize_before (bool):
+            True: use layer_norm before each sub-block.
+            False: to use layer_norm after each sub-block.
+    """
+
+    def __init__(
+        self,
+        size: int,
+        self_attn: torch.nn.Module,
+        feed_forward: torch.nn.Module,
+        dropout_rate: float,
+        normalize_before: bool = True,
+    ):
+        """Construct an EncoderLayer object."""
+        super().__init__()
+        self.self_attn = self_attn
+        self.feed_forward = feed_forward
+        self.norm1 = nn.LayerNorm(size, eps=1e-12)
+        self.norm2 = nn.LayerNorm(size, eps=1e-12)
+        self.dropout = nn.Dropout(dropout_rate)
+        self.size = size
+        self.normalize_before = normalize_before
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        mask: torch.Tensor,
+        pos_emb: torch.Tensor,
+        mask_pad: torch.Tensor = torch.ones((0, 0, 0), dtype=torch.bool),
+        att_cache: torch.Tensor = torch.zeros((0, 0, 0, 0)),
+        cnn_cache: torch.Tensor = torch.zeros((0, 0, 0, 0)),
+    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor, torch.Tensor]:
+        """Compute encoded features.
+
+        Args:
+            x (torch.Tensor): (#batch, time, size)
+            mask (torch.Tensor): Mask tensor for the input (#batch, time，time),
+                (0, 0, 0) means fake mask.
+            pos_emb (torch.Tensor): just for interface compatibility
+                to ConformerEncoderLayer
+            mask_pad (torch.Tensor): does not used in transformer layer,
+                just for unified api with conformer.
+            att_cache (torch.Tensor): Cache tensor of the KEY & VALUE
+                (#batch=1, head, cache_t1, d_k * 2), head * d_k == size.
+            cnn_cache (torch.Tensor): Convolution cache in conformer layer
+                (#batch=1, size, cache_t2), not used here, it's for interface
+                compatibility to ConformerEncoderLayer.
+        Returns:
+            torch.Tensor: Output tensor (#batch, time, size).
+            torch.Tensor: Mask tensor (#batch, time, time).
+            torch.Tensor: att_cache tensor,
+                (#batch=1, head, cache_t1 + time, d_k * 2).
+            torch.Tensor: cnn_cahce tensor (#batch=1, size, cache_t2).
+
+        """
+        residual = x
+        if self.normalize_before:
+            x = self.norm1(x)
+        x_att, new_att_cache = self.self_attn(x, x, x, mask, pos_emb=pos_emb, cache=att_cache)
+        x = residual + self.dropout(x_att)
+        if not self.normalize_before:
+            x = self.norm1(x)
+
+        residual = x
+        if self.normalize_before:
+            x = self.norm2(x)
+        x = residual + self.dropout(self.feed_forward(x))
+        if not self.normalize_before:
+            x = self.norm2(x)
+
+        fake_cnn_cache = torch.zeros((0, 0, 0), dtype=x.dtype, device=x.device)
+        return x, mask, new_att_cache, fake_cnn_cache
+
+
+class ConformerEncoderLayer(nn.Module):
+    """Encoder layer module.
+    Args:
+        size (int): Input dimension.
+        self_attn (torch.nn.Module): Self-attention module instance.
+            `MultiHeadedAttention` or `RelPositionMultiHeadedAttention`
+            instance can be used as the argument.
+        feed_forward (torch.nn.Module): Feed-forward module instance.
+            `PositionwiseFeedForward` instance can be used as the argument.
+        feed_forward_macaron (torch.nn.Module): Additional feed-forward module
+             instance.
+            `PositionwiseFeedForward` instance can be used as the argument.
+        conv_module (torch.nn.Module): Convolution module instance.
+            `ConvlutionModule` instance can be used as the argument.
+        dropout_rate (float): Dropout rate.
+        normalize_before (bool):
+            True: use layer_norm before each sub-block.
+            False: use layer_norm after each sub-block.
+    """
+
+    def __init__(
+        self,
+        size: int,
+        self_attn: torch.nn.Module,
+        feed_forward: Optional[nn.Module] = None,
+        feed_forward_macaron: Optional[nn.Module] = None,
+        conv_module: Optional[nn.Module] = None,
+        dropout_rate: float = 0.1,
+        normalize_before: bool = True,
+    ):
+        """Construct an EncoderLayer object."""
+        super().__init__()
+        self.self_attn = self_attn
+        self.feed_forward = feed_forward
+        self.feed_forward_macaron = feed_forward_macaron
+        self.conv_module = conv_module
+        self.norm_ff = nn.LayerNorm(size, eps=1e-12)  # for the FNN module
+        self.norm_mha = nn.LayerNorm(size, eps=1e-12)  # for the MHA module
+        if feed_forward_macaron is not None:
+            self.norm_ff_macaron = nn.LayerNorm(size, eps=1e-12)
+            self.ff_scale = 0.5
+        else:
+            self.ff_scale = 1.0
+        if self.conv_module is not None:
+            self.norm_conv = nn.LayerNorm(size, eps=1e-12)  # for the CNN module
+            self.norm_final = nn.LayerNorm(
+                size, eps=1e-12)  # for the final output of the block
+        self.dropout = nn.Dropout(dropout_rate)
+        self.size = size
+        self.normalize_before = normalize_before
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        mask: torch.Tensor,
+        pos_emb: torch.Tensor,
+        mask_pad: torch.Tensor = torch.ones((0, 0, 0), dtype=torch.bool),
+        att_cache: torch.Tensor = torch.zeros((0, 0, 0, 0)),
+        cnn_cache: torch.Tensor = torch.zeros((0, 0, 0, 0)),
+    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor, torch.Tensor]:
+        """Compute encoded features.
+
+        Args:
+            x (torch.Tensor): (#batch, time, size)
+            mask (torch.Tensor): Mask tensor for the input (#batch, time，time),
+                (0, 0, 0) means fake mask.
+            pos_emb (torch.Tensor): positional encoding, must not be None
+                for ConformerEncoderLayer.
+            mask_pad (torch.Tensor): batch padding mask used for conv module.
+                (#batch, 1，time), (0, 0, 0) means fake mask.
+            att_cache (torch.Tensor): Cache tensor of the KEY & VALUE
+                (#batch=1, head, cache_t1, d_k * 2), head * d_k == size.
+            cnn_cache (torch.Tensor): Convolution cache in conformer layer
+                (#batch=1, size, cache_t2)
+        Returns:
+            torch.Tensor: Output tensor (#batch, time, size).
+            torch.Tensor: Mask tensor (#batch, time, time).
+            torch.Tensor: att_cache tensor,
+                (#batch=1, head, cache_t1 + time, d_k * 2).
+            torch.Tensor: cnn_cahce tensor (#batch, size, cache_t2).
+        """
+
+        # whether to use macaron style
+        if self.feed_forward_macaron is not None:
+            residual = x
+            if self.normalize_before:
+                x = self.norm_ff_macaron(x)
+            x = residual + self.ff_scale * self.dropout(
+                self.feed_forward_macaron(x))
+            if not self.normalize_before:
+                x = self.norm_ff_macaron(x)
+
+        # multi-headed self-attention module
+        residual = x
+        if self.normalize_before:
+            x = self.norm_mha(x)
+        x_att, new_att_cache = self.self_attn(x, x, x, mask, pos_emb,
+                                              att_cache)
+        x = residual + self.dropout(x_att)
+        if not self.normalize_before:
+            x = self.norm_mha(x)
+
+        # convolution module
+        # Fake new cnn cache here, and then change it in conv_module
+        new_cnn_cache = torch.zeros((0, 0, 0), dtype=x.dtype, device=x.device)
+        if self.conv_module is not None:
+            residual = x
+            if self.normalize_before:
+                x = self.norm_conv(x)
+            x, new_cnn_cache = self.conv_module(x, mask_pad, cnn_cache)
+            x = residual + self.dropout(x)
+
+            if not self.normalize_before:
+                x = self.norm_conv(x)
+
+        # feed forward module
+        residual = x
+        if self.normalize_before:
+            x = self.norm_ff(x)
+
+        x = residual + self.ff_scale * self.dropout(self.feed_forward(x))
+        if not self.normalize_before:
+            x = self.norm_ff(x)
+
+        if self.conv_module is not None:
+            x = self.norm_final(x)
+
+        return x, mask, new_att_cache, new_cnn_cache

src/chatterbox/models/s3gen/transformer/positionwise_feed_forward.py

@@ -0,0 +1,115 @@
+# Copyright (c) 2019 Shigeki Karita
+#               2020 Mobvoi Inc (Binbin Zhang)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Positionwise feed forward layer definition."""
+
+import torch
+
+
+class PositionwiseFeedForward(torch.nn.Module):
+    """Positionwise feed forward layer.
+
+    FeedForward are appied on each position of the sequence.
+    The output dim is same with the input dim.
+
+    Args:
+        idim (int): Input dimenstion.
+        hidden_units (int): The number of hidden units.
+        dropout_rate (float): Dropout rate.
+        activation (torch.nn.Module): Activation function
+    """
+
+    def __init__(
+            self,
+            idim: int,
+            hidden_units: int,
+            dropout_rate: float,
+            activation: torch.nn.Module = torch.nn.ReLU(),
+    ):
+        """Construct a PositionwiseFeedForward object."""
+        super(PositionwiseFeedForward, self).__init__()
+        self.w_1 = torch.nn.Linear(idim, hidden_units)
+        self.activation = activation
+        self.dropout = torch.nn.Dropout(dropout_rate)
+        self.w_2 = torch.nn.Linear(hidden_units, idim)
+
+    def forward(self, xs: torch.Tensor) -> torch.Tensor:
+        """Forward function.
+
+        Args:
+            xs: input tensor (B, L, D)
+        Returns:
+            output tensor, (B, L, D)
+        """
+        return self.w_2(self.dropout(self.activation(self.w_1(xs))))
+
+
+class MoEFFNLayer(torch.nn.Module):
+    """
+    Mixture of expert with Positionwise feed forward layer
+    See also figure 1 in https://arxiv.org/pdf/2305.15663.pdf
+    The output dim is same with the input dim.
+
+    Modified from https://github.com/Lightning-AI/lit-gpt/pull/823
+                  https://github.com/mistralai/mistral-src/blob/b46d6/moe_one_file_ref.py#L203-L219
+    Args:
+        n_expert: number of expert.
+        n_expert_per_token: The actual number of experts used for each frame
+        idim (int): Input dimenstion.
+        hidden_units (int): The number of hidden units.
+        dropout_rate (float): Dropout rate.
+        activation (torch.nn.Module): Activation function
+    """
+
+    def __init__(
+            self,
+            n_expert: int,
+            n_expert_per_token: int,
+            idim: int,
+            hidden_units: int,
+            dropout_rate: float,
+            activation: torch.nn.Module = torch.nn.ReLU(),
+    ):
+        super(MoEFFNLayer, self).__init__()
+        self.gate = torch.nn.Linear(idim, n_expert, bias=False)
+        self.experts = torch.nn.ModuleList(
+            PositionwiseFeedForward(idim, hidden_units, dropout_rate,
+                                    activation) for _ in range(n_expert))
+        self.n_expert_per_token = n_expert_per_token
+
+    def forward(self, xs: torch.Tensor) -> torch.Tensor:
+        """Foward function.
+        Args:
+            xs: input tensor (B, L, D)
+        Returns:
+            output tensor, (B, L, D)
+
+        """
+        B, L, D = xs.size(
+        )  # batch size, sequence length, embedding dimension (idim)
+        xs = xs.view(-1, D)  # (B*L, D)
+        router = self.gate(xs)  # (B*L, n_expert)
+        logits, indices = torch.topk(
+            router, self.n_expert_per_token
+        )  # probs:(B*L, n_expert), indices: (B*L, n_expert)
+        weights = torch.nn.functional.softmax(
+            logits, dim=1,
+            dtype=torch.float).to(dtype=xs.dtype)  # (B*L, n_expert_per_token)
+        output = torch.zeros_like(xs)  # (B*L, D)
+        for i, expert in enumerate(self.experts):
+            mask = indices == i
+            batch_idx, ith_expert = torch.where(mask)
+            output[batch_idx] += weights[batch_idx, ith_expert, None] * expert(
+                xs[batch_idx])
+        return output.view(B, L, D)

src/chatterbox/models/s3gen/transformer/subsampling.py

@@ -0,0 +1,383 @@
+# Copyright (c) 2021 Mobvoi Inc (Binbin Zhang, Di Wu)
+#               2024 Alibaba Inc (Xiang Lyu)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# Modified from ESPnet(https://github.com/espnet/espnet)
+"""Subsampling layer definition."""
+
+from typing import Tuple, Union
+
+import torch
+
+
+class BaseSubsampling(torch.nn.Module):
+
+    def __init__(self):
+        super().__init__()
+        self.right_context = 0
+        self.subsampling_rate = 1
+
+    def position_encoding(self, offset: Union[int, torch.Tensor],
+                          size: int) -> torch.Tensor:
+        return self.pos_enc.position_encoding(offset, size)
+
+
+class EmbedinigNoSubsampling(BaseSubsampling):
+    """Embedding input without subsampling
+    """
+
+    def __init__(self, idim: int, odim: int, dropout_rate: float,
+                 pos_enc_class: torch.nn.Module):
+        super().__init__()
+        self.embed = torch.nn.Embedding(idim, odim)
+        self.pos_enc = pos_enc_class
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        x_mask: torch.Tensor,
+        offset: Union[int, torch.Tensor] = 0
+    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
+        """Input x.
+
+        Args:
+            x (torch.Tensor): Input tensor (#batch, time, idim).
+            x_mask (torch.Tensor): Input mask (#batch, 1, time).
+
+        Returns:
+            torch.Tensor: linear input tensor (#batch, time', odim),
+                where time' = time .
+            torch.Tensor: linear input mask (#batch, 1, time'),
+                where time' = time .
+
+        """
+        x = self.embed(x)
+        x, pos_emb = self.pos_enc(x, offset)
+        return x, pos_emb, x_mask
+
+
+class LinearNoSubsampling(BaseSubsampling):
+    """Linear transform the input without subsampling
+
+    Args:
+        idim (int): Input dimension.
+        odim (int): Output dimension.
+        dropout_rate (float): Dropout rate.
+
+    """
+
+    def __init__(self, idim: int, odim: int, dropout_rate: float,
+                 pos_enc_class: torch.nn.Module):
+        """Construct an linear object."""
+        super().__init__()
+        self.out = torch.nn.Sequential(
+            torch.nn.Linear(idim, odim),
+            torch.nn.LayerNorm(odim, eps=1e-5),
+            torch.nn.Dropout(dropout_rate),
+        )
+        self.pos_enc = pos_enc_class
+        self.right_context = 0
+        self.subsampling_rate = 1
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        x_mask: torch.Tensor,
+        offset: Union[int, torch.Tensor] = 0
+    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
+        """Input x.
+
+        Args:
+            x (torch.Tensor): Input tensor (#batch, time, idim).
+            x_mask (torch.Tensor): Input mask (#batch, 1, time).
+
+        Returns:
+            torch.Tensor: linear input tensor (#batch, time', odim),
+                where time' = time .
+            torch.Tensor: linear input mask (#batch, 1, time'),
+                where time' = time .
+
+        """
+        x = self.out(x)
+        x, pos_emb = self.pos_enc(x, offset)
+        return x, pos_emb, x_mask
+
+
+class Conv1dSubsampling2(BaseSubsampling):
+    """Convolutional 1D subsampling (to 1/2 length).
+       It is designed for Whisper, ref:
+       https://github.com/openai/whisper/blob/main/whisper/model.py
+
+    Args:
+        idim (int): Input dimension.
+        odim (int): Output dimension.
+        dropout_rate (float): Dropout rate.
+
+    """
+
+    def __init__(self, idim: int, odim: int, dropout_rate: float,
+                 pos_enc_class: torch.nn.Module):
+        """Construct an Conv1dSubsampling2 object."""
+        super().__init__()
+        self.conv = torch.nn.Sequential(
+            torch.nn.Conv1d(idim, odim, kernel_size=3, padding=1),
+            torch.nn.GELU(),
+            torch.nn.Conv1d(odim, odim, kernel_size=3, stride=2, padding=1),
+            torch.nn.GELU(),
+        )
+        self.pos_enc = pos_enc_class
+        # The right context for every conv layer is computed by:
+        # (kernel_size - 1) * frame_rate_of_this_layer
+        self.subsampling_rate = 2
+        # 4 = (3 - 1) * 1 + (3 - 1) * 1
+        self.right_context = 4
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        x_mask: torch.Tensor,
+        offset: Union[int, torch.Tensor] = 0
+    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
+        """Subsample x.
+
+        Args:
+            x (torch.Tensor): Input tensor (#batch, time, idim).
+            x_mask (torch.Tensor): Input mask (#batch, 1, time).
+
+        Returns:
+            torch.Tensor: Subsampled tensor (#batch, time', odim),
+                where time' = time // 2.
+            torch.Tensor: Subsampled mask (#batch, 1, time'),
+                where time' = time // 2.
+            torch.Tensor: positional encoding
+
+        """
+        time = x.size(1)
+        x = x.transpose(1, 2)  # (b, f, t)
+        x = self.conv(x)
+        x = x.transpose(1, 2)  # (b, t, f)
+        x, pos_emb = self.pos_enc(x, offset)
+        return x, pos_emb, x_mask[:, :, (time + 1) % 2::2]
+
+
+class Conv2dSubsampling4(BaseSubsampling):
+    """Convolutional 2D subsampling (to 1/4 length).
+
+    Args:
+        idim (int): Input dimension.
+        odim (int): Output dimension.
+        dropout_rate (float): Dropout rate.
+
+    """
+
+    def __init__(self, idim: int, odim: int, dropout_rate: float,
+                 pos_enc_class: torch.nn.Module):
+        """Construct an Conv2dSubsampling4 object."""
+        super().__init__()
+        self.conv = torch.nn.Sequential(
+            torch.nn.Conv2d(1, odim, 3, 2),
+            torch.nn.ReLU(),
+            torch.nn.Conv2d(odim, odim, 3, 2),
+            torch.nn.ReLU(),
+        )
+        self.out = torch.nn.Sequential(
+            torch.nn.Linear(odim * (((idim - 1) // 2 - 1) // 2), odim))
+        self.pos_enc = pos_enc_class
+        # The right context for every conv layer is computed by:
+        # (kernel_size - 1) * frame_rate_of_this_layer
+        self.subsampling_rate = 4
+        # 6 = (3 - 1) * 1 + (3 - 1) * 2
+        self.right_context = 6
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        x_mask: torch.Tensor,
+        offset: Union[int, torch.Tensor] = 0
+    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
+        """Subsample x.
+
+        Args:
+            x (torch.Tensor): Input tensor (#batch, time, idim).
+            x_mask (torch.Tensor): Input mask (#batch, 1, time).
+
+        Returns:
+            torch.Tensor: Subsampled tensor (#batch, time', odim),
+                where time' = time // 4.
+            torch.Tensor: Subsampled mask (#batch, 1, time'),
+                where time' = time // 4.
+            torch.Tensor: positional encoding
+
+        """
+        x = x.unsqueeze(1)  # (b, c=1, t, f)
+        x = self.conv(x)
+        b, c, t, f = x.size()
+        x = self.out(x.transpose(1, 2).contiguous().view(b, t, c * f))
+        x, pos_emb = self.pos_enc(x, offset)
+        return x, pos_emb, x_mask[:, :, 2::2][:, :, 2::2]
+
+
+class Conv2dSubsampling6(BaseSubsampling):
+    """Convolutional 2D subsampling (to 1/6 length).
+    Args:
+        idim (int): Input dimension.
+        odim (int): Output dimension.
+        dropout_rate (float): Dropout rate.
+        pos_enc (torch.nn.Module): Custom position encoding layer.
+    """
+
+    def __init__(self, idim: int, odim: int, dropout_rate: float,
+                 pos_enc_class: torch.nn.Module):
+        """Construct an Conv2dSubsampling6 object."""
+        super().__init__()
+        self.conv = torch.nn.Sequential(
+            torch.nn.Conv2d(1, odim, 3, 2),
+            torch.nn.ReLU(),
+            torch.nn.Conv2d(odim, odim, 5, 3),
+            torch.nn.ReLU(),
+        )
+        self.linear = torch.nn.Linear(odim * (((idim - 1) // 2 - 2) // 3),
+                                      odim)
+        self.pos_enc = pos_enc_class
+        # 10 = (3 - 1) * 1 + (5 - 1) * 2
+        self.subsampling_rate = 6
+        self.right_context = 10
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        x_mask: torch.Tensor,
+        offset: Union[int, torch.Tensor] = 0
+    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
+        """Subsample x.
+        Args:
+            x (torch.Tensor): Input tensor (#batch, time, idim).
+            x_mask (torch.Tensor): Input mask (#batch, 1, time).
+
+        Returns:
+            torch.Tensor: Subsampled tensor (#batch, time', odim),
+                where time' = time // 6.
+            torch.Tensor: Subsampled mask (#batch, 1, time'),
+                where time' = time // 6.
+            torch.Tensor: positional encoding
+        """
+        x = x.unsqueeze(1)  # (b, c, t, f)
+        x = self.conv(x)
+        b, c, t, f = x.size()
+        x = self.linear(x.transpose(1, 2).contiguous().view(b, t, c * f))
+        x, pos_emb = self.pos_enc(x, offset)
+        return x, pos_emb, x_mask[:, :, 2::2][:, :, 4::3]
+
+
+class Conv2dSubsampling8(BaseSubsampling):
+    """Convolutional 2D subsampling (to 1/8 length).
+
+    Args:
+        idim (int): Input dimension.
+        odim (int): Output dimension.
+        dropout_rate (float): Dropout rate.
+
+    """
+
+    def __init__(self, idim: int, odim: int, dropout_rate: float,
+                 pos_enc_class: torch.nn.Module):
+        """Construct an Conv2dSubsampling8 object."""
+        super().__init__()
+        self.conv = torch.nn.Sequential(
+            torch.nn.Conv2d(1, odim, 3, 2),
+            torch.nn.ReLU(),
+            torch.nn.Conv2d(odim, odim, 3, 2),
+            torch.nn.ReLU(),
+            torch.nn.Conv2d(odim, odim, 3, 2),
+            torch.nn.ReLU(),
+        )
+        self.linear = torch.nn.Linear(
+            odim * ((((idim - 1) // 2 - 1) // 2 - 1) // 2), odim)
+        self.pos_enc = pos_enc_class
+        self.subsampling_rate = 8
+        # 14 = (3 - 1) * 1 + (3 - 1) * 2 + (3 - 1) * 4
+        self.right_context = 14
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        x_mask: torch.Tensor,
+        offset: Union[int, torch.Tensor] = 0
+    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
+        """Subsample x.
+
+        Args:
+            x (torch.Tensor): Input tensor (#batch, time, idim).
+            x_mask (torch.Tensor): Input mask (#batch, 1, time).
+
+        Returns:
+            torch.Tensor: Subsampled tensor (#batch, time', odim),
+                where time' = time // 8.
+            torch.Tensor: Subsampled mask (#batch, 1, time'),
+                where time' = time // 8.
+            torch.Tensor: positional encoding
+        """
+        x = x.unsqueeze(1)  # (b, c, t, f)
+        x = self.conv(x)
+        b, c, t, f = x.size()
+        x = self.linear(x.transpose(1, 2).contiguous().view(b, t, c * f))
+        x, pos_emb = self.pos_enc(x, offset)
+        return x, pos_emb, x_mask[:, :, 2::2][:, :, 2::2][:, :, 2::2]
+
+
+class LegacyLinearNoSubsampling(BaseSubsampling):
+    """Linear transform the input without subsampling
+
+    Args:
+        idim (int): Input dimension.
+        odim (int): Output dimension.
+        dropout_rate (float): Dropout rate.
+
+    """
+
+    def __init__(self, idim: int, odim: int, dropout_rate: float,
+                 pos_enc_class: torch.nn.Module):
+        """Construct an linear object."""
+        super().__init__()
+        self.out = torch.nn.Sequential(
+            torch.nn.Linear(idim, odim),
+            torch.nn.LayerNorm(odim, eps=1e-5),
+            torch.nn.Dropout(dropout_rate),
+            torch.nn.ReLU(),
+        )
+        self.pos_enc = pos_enc_class
+        self.right_context = 0
+        self.subsampling_rate = 1
+
+    def forward(
+        self,
+        x: torch.Tensor,
+        x_mask: torch.Tensor,
+        offset: Union[int, torch.Tensor] = 0
+    ) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
+        """Input x.
+
+        Args:
+            x (torch.Tensor): Input tensor (#batch, time, idim).
+            x_mask (torch.Tensor): Input mask (#batch, 1, time).
+
+        Returns:
+            torch.Tensor: linear input tensor (#batch, time', odim),
+                where time' = time .
+            torch.Tensor: linear input mask (#batch, 1, time'),
+                where time' = time .
+
+        """
+        x = self.out(x)
+        x, pos_emb = self.pos_enc(x, offset)
+        return x, pos_emb, x_mask

src/chatterbox/models/s3gen/transformer/upsample_encoder.py

@@ -0,0 +1,318 @@
+# Copyright (c) 2021 Mobvoi Inc (Binbin Zhang, Di Wu)
+#               2022 Xingchen Song (sxc19@mails.tsinghua.edu.cn)
+#               2024 Alibaba Inc (Xiang Lyu)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# Modified from ESPnet(https://github.com/espnet/espnet)
+"""Encoder definition."""
+from typing import Tuple
+
+import torch
+from torch import nn
+from torch.nn import functional as F
+
+from .convolution import ConvolutionModule
+from .encoder_layer import ConformerEncoderLayer
+from .positionwise_feed_forward import PositionwiseFeedForward
+from ..utils.class_utils import (
+    COSYVOICE_EMB_CLASSES,
+    COSYVOICE_SUBSAMPLE_CLASSES,
+    COSYVOICE_ATTENTION_CLASSES,
+    COSYVOICE_ACTIVATION_CLASSES,
+)
+from ..utils.mask import make_pad_mask
+from ..utils.mask import add_optional_chunk_mask
+
+
+class Upsample1D(nn.Module):
+    """A 1D upsampling layer with an optional convolution.
+
+    Parameters:
+        channels (`int`):
+            number of channels in the inputs and outputs.
+        use_conv (`bool`, default `False`):
+            option to use a convolution.
+        use_conv_transpose (`bool`, default `False`):
+            option to use a convolution transpose.
+        out_channels (`int`, optional):
+            number of output channels. Defaults to `channels`.
+    """
+
+    def __init__(self, channels: int, out_channels: int, stride: int = 2):
+        super().__init__()
+        self.channels = channels
+        self.out_channels = out_channels
+        self.stride = stride
+        # In this mode, first repeat interpolate, than conv with stride=1
+        self.conv = nn.Conv1d(self.channels, self.out_channels, stride * 2 + 1, stride=1, padding=0)
+
+    def forward(self, inputs: torch.Tensor, input_lengths: torch.Tensor):
+        outputs = F.interpolate(inputs, scale_factor=float(self.stride), mode="nearest")
+        outputs = F.pad(outputs, (self.stride * 2, 0), value=0.0)
+        outputs = self.conv(outputs)
+        return outputs, input_lengths * self.stride
+
+
+class PreLookaheadLayer(nn.Module):
+    def __init__(self, channels: int, pre_lookahead_len: int = 1):
+        super().__init__()
+        self.channels = channels
+        self.pre_lookahead_len = pre_lookahead_len
+        self.conv1 = nn.Conv1d(
+            channels, channels,
+            kernel_size=pre_lookahead_len + 1,
+            stride=1, padding=0,
+        )
+        self.conv2 = nn.Conv1d(
+            channels, channels,
+            kernel_size=3, stride=1, padding=0,
+        )
+
+    def forward(self, inputs: torch.Tensor) -> torch.Tensor:
+        """
+        inputs: (batch_size, seq_len, channels)
+        """
+        outputs = inputs.transpose(1, 2).contiguous()
+        # look ahead
+        outputs = F.pad(outputs, (0, self.pre_lookahead_len), mode='constant', value=0.0)
+        outputs = F.leaky_relu(self.conv1(outputs))
+        # outputs
+        outputs = F.pad(outputs, (2, 0), mode='constant', value=0.0)
+        outputs = self.conv2(outputs)
+        outputs = outputs.transpose(1, 2).contiguous()
+
+        # residual connection
+        outputs = outputs + inputs
+        return outputs
+
+
+class UpsampleConformerEncoder(torch.nn.Module):
+
+    def __init__(
+        self,
+        input_size: int = 512,
+        output_size: int = 512,
+        attention_heads: int = 8,
+        linear_units: int = 2048,
+        num_blocks: int = 6,
+        dropout_rate: float = 0.1,
+        positional_dropout_rate: float = 0.1,
+        attention_dropout_rate: float = 0.1,
+        input_layer: str = "linear",
+        pos_enc_layer_type: str = "rel_pos_espnet",
+        normalize_before: bool = True,
+        static_chunk_size: int = 0,
+        use_dynamic_chunk: bool = False,
+        global_cmvn: torch.nn.Module = None,
+        use_dynamic_left_chunk: bool = False,
+        positionwise_conv_kernel_size: int = 1,
+        macaron_style: bool = False,
+        selfattention_layer_type: str = "rel_selfattn",
+        activation_type: str = "swish",
+        use_cnn_module: bool = False,
+        cnn_module_kernel: int = 15,
+        causal: bool = False,
+        cnn_module_norm: str = "batch_norm",
+        key_bias: bool = True,
+        gradient_checkpointing: bool = False,
+    ):
+        """
+        Args:
+            input_size (int): input dim
+            output_size (int): dimension of attention
+            attention_heads (int): the number of heads of multi head attention
+            linear_units (int): the hidden units number of position-wise feed
+                forward
+            num_blocks (int): the number of decoder blocks
+            dropout_rate (float): dropout rate
+            attention_dropout_rate (float): dropout rate in attention
+            positional_dropout_rate (float): dropout rate after adding
+                positional encoding
+            input_layer (str): input layer type.
+                optional [linear, conv2d, conv2d6, conv2d8]
+            pos_enc_layer_type (str): Encoder positional encoding layer type.
+                opitonal [abs_pos, scaled_abs_pos, rel_pos, no_pos]
+            normalize_before (bool):
+                True: use layer_norm before each sub-block of a layer.
+                False: use layer_norm after each sub-block of a layer.
+            static_chunk_size (int): chunk size for static chunk training and
+                decoding
+            use_dynamic_chunk (bool): whether use dynamic chunk size for
+                training or not, You can only use fixed chunk(chunk_size > 0)
+                or dyanmic chunk size(use_dynamic_chunk = True)
+            global_cmvn (Optional[torch.nn.Module]): Optional GlobalCMVN module
+            use_dynamic_left_chunk (bool): whether use dynamic left chunk in
+                dynamic chunk training
+            key_bias: whether use bias in attention.linear_k, False for whisper models.
+            gradient_checkpointing: rerunning a forward-pass segment for each
+                checkpointed segment during backward.
+        """
+        super().__init__()
+        self._output_size = output_size
+
+        self.global_cmvn = global_cmvn
+        self.embed = COSYVOICE_SUBSAMPLE_CLASSES[input_layer](
+            input_size,
+            output_size,
+            dropout_rate,
+            COSYVOICE_EMB_CLASSES[pos_enc_layer_type](output_size,
+                                                      positional_dropout_rate),
+        )
+
+        self.normalize_before = normalize_before
+        self.after_norm = torch.nn.LayerNorm(output_size, eps=1e-5)
+        self.static_chunk_size = static_chunk_size
+        self.use_dynamic_chunk = use_dynamic_chunk
+        self.use_dynamic_left_chunk = use_dynamic_left_chunk
+        self.gradient_checkpointing = gradient_checkpointing
+        activation = COSYVOICE_ACTIVATION_CLASSES[activation_type]()
+        # self-attention module definition
+        encoder_selfattn_layer_args = (
+            attention_heads,
+            output_size,
+            attention_dropout_rate,
+            key_bias,
+        )
+        # feed-forward module definition
+        positionwise_layer_args = (
+            output_size,
+            linear_units,
+            dropout_rate,
+            activation,
+        )
+        # convolution module definition
+        convolution_layer_args = (output_size, cnn_module_kernel, activation,
+                                  cnn_module_norm, causal)
+        self.pre_lookahead_layer = PreLookaheadLayer(channels=512, pre_lookahead_len=3)
+        self.encoders = torch.nn.ModuleList([
+            ConformerEncoderLayer(
+                output_size,
+                COSYVOICE_ATTENTION_CLASSES[selfattention_layer_type](
+                    *encoder_selfattn_layer_args),
+                PositionwiseFeedForward(*positionwise_layer_args),
+                PositionwiseFeedForward(
+                    *positionwise_layer_args) if macaron_style else None,
+                ConvolutionModule(
+                    *convolution_layer_args) if use_cnn_module else None,
+                dropout_rate,
+                normalize_before,
+            ) for _ in range(num_blocks)
+        ])
+        self.up_layer = Upsample1D(channels=512, out_channels=512, stride=2)
+        self.up_embed = COSYVOICE_SUBSAMPLE_CLASSES[input_layer](
+            input_size,
+            output_size,
+            dropout_rate,
+            COSYVOICE_EMB_CLASSES[pos_enc_layer_type](output_size,
+                                                      positional_dropout_rate),
+        )
+        self.up_encoders = torch.nn.ModuleList([
+            ConformerEncoderLayer(
+                output_size,
+                COSYVOICE_ATTENTION_CLASSES[selfattention_layer_type](
+                    *encoder_selfattn_layer_args),
+                PositionwiseFeedForward(*positionwise_layer_args),
+                PositionwiseFeedForward(
+                    *positionwise_layer_args) if macaron_style else None,
+                ConvolutionModule(
+                    *convolution_layer_args) if use_cnn_module else None,
+                dropout_rate,
+                normalize_before,
+            ) for _ in range(4)
+        ])
+
+    def output_size(self) -> int:
+        return self._output_size
+
+    def forward(
+        self,
+        xs: torch.Tensor,
+        xs_lens: torch.Tensor,
+        decoding_chunk_size: int = 0,
+        num_decoding_left_chunks: int = -1,
+    ) -> Tuple[torch.Tensor, torch.Tensor]:
+        """Embed positions in tensor.
+
+        Args:
+            xs: padded input tensor (B, T, D)
+            xs_lens: input length (B)
+            decoding_chunk_size: decoding chunk size for dynamic chunk
+                0: default for training, use random dynamic chunk.
+                <0: for decoding, use full chunk.
+                >0: for decoding, use fixed chunk size as set.
+            num_decoding_left_chunks: number of left chunks, this is for decoding,
+            the chunk size is decoding_chunk_size.
+                >=0: use num_decoding_left_chunks
+                <0: use all left chunks
+        Returns:
+            encoder output tensor xs, and subsampled masks
+            xs: padded output tensor (B, T' ~= T/subsample_rate, D)
+            masks: torch.Tensor batch padding mask after subsample
+                (B, 1, T' ~= T/subsample_rate)
+        NOTE(xcsong):
+            We pass the `__call__` method of the modules instead of `forward` to the
+            checkpointing API because `__call__` attaches all the hooks of the module.
+            https://discuss.pytorch.org/t/any-different-between-model-input-and-model-forward-input/3690/2
+        """
+        T = xs.size(1)
+        masks = ~make_pad_mask(xs_lens, T).unsqueeze(1)  # (B, 1, T)
+        if self.global_cmvn is not None:
+            xs = self.global_cmvn(xs)
+        xs, pos_emb, masks = self.embed(xs, masks)
+        mask_pad = masks  # (B, 1, T/subsample_rate)
+        chunk_masks = add_optional_chunk_mask(xs, masks,
+                                              self.use_dynamic_chunk,
+                                              self.use_dynamic_left_chunk,
+                                              decoding_chunk_size,
+                                              self.static_chunk_size,
+                                              num_decoding_left_chunks)
+        # lookahead + conformer encoder
+        xs = self.pre_lookahead_layer(xs)
+        xs = self.forward_layers(xs, chunk_masks, pos_emb, mask_pad)
+
+        # upsample + conformer encoder
+        xs = xs.transpose(1, 2).contiguous()
+        xs, xs_lens = self.up_layer(xs, xs_lens)
+        xs = xs.transpose(1, 2).contiguous()
+        T = xs.size(1)
+        masks = ~make_pad_mask(xs_lens, T).unsqueeze(1)  # (B, 1, T)
+        xs, pos_emb, masks = self.up_embed(xs, masks)
+        mask_pad = masks  # (B, 1, T/subsample_rate)
+        chunk_masks = add_optional_chunk_mask(xs, masks,
+                                              self.use_dynamic_chunk,
+                                              self.use_dynamic_left_chunk,
+                                              decoding_chunk_size,
+                                              self.static_chunk_size * self.up_layer.stride,
+                                              num_decoding_left_chunks)
+        xs = self.forward_up_layers(xs, chunk_masks, pos_emb, mask_pad)
+
+        if self.normalize_before:
+            xs = self.after_norm(xs)
+        # Here we assume the mask is not changed in encoder layers, so just
+        # return the masks before encoder layers, and the masks will be used
+        # for cross attention with decoder later
+        return xs, masks
+
+    def forward_layers(self, xs: torch.Tensor, chunk_masks: torch.Tensor,
+                       pos_emb: torch.Tensor,
+                       mask_pad: torch.Tensor) -> torch.Tensor:
+        for layer in self.encoders:
+            xs, chunk_masks, _, _ = layer(xs, chunk_masks, pos_emb, mask_pad)
+        return xs
+
+    def forward_up_layers(self, xs: torch.Tensor, chunk_masks: torch.Tensor,
+                          pos_emb: torch.Tensor,
+                          mask_pad: torch.Tensor) -> torch.Tensor:
+        for layer in self.up_encoders:
+            xs, chunk_masks, _, _ = layer(xs, chunk_masks, pos_emb, mask_pad)
+        return xs

src/chatterbox/models/s3gen/utils/class_utils.py

@@ -0,0 +1,71 @@
+# Copyright [2023-11-28] <sxc19@mails.tsinghua.edu.cn, Xingchen Song>
+#            2024 Alibaba Inc (authors: Xiang Lyu)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import torch
+
+from ..transformer.activation import Swish
+from ..transformer.subsampling import (
+    LinearNoSubsampling,
+    EmbedinigNoSubsampling,
+    Conv1dSubsampling2,
+    Conv2dSubsampling4,
+    Conv2dSubsampling6,
+    Conv2dSubsampling8,
+)
+from ..transformer.embedding import (
+    PositionalEncoding,
+    RelPositionalEncoding,
+    WhisperPositionalEncoding,
+    LearnablePositionalEncoding,
+    NoPositionalEncoding)
+from ..transformer.attention import (MultiHeadedAttention,
+    RelPositionMultiHeadedAttention)
+from ..transformer.embedding import EspnetRelPositionalEncoding
+from ..transformer.subsampling import LegacyLinearNoSubsampling
+
+
+COSYVOICE_ACTIVATION_CLASSES = {
+    "hardtanh": torch.nn.Hardtanh,
+    "tanh": torch.nn.Tanh,
+    "relu": torch.nn.ReLU,
+    "selu": torch.nn.SELU,
+    "swish": getattr(torch.nn, "SiLU", Swish),
+    "gelu": torch.nn.GELU,
+}
+
+COSYVOICE_SUBSAMPLE_CLASSES = {
+    "linear": LinearNoSubsampling,
+    "linear_legacy": LegacyLinearNoSubsampling,
+    "embed": EmbedinigNoSubsampling,
+    "conv1d2": Conv1dSubsampling2,
+    "conv2d": Conv2dSubsampling4,
+    "conv2d6": Conv2dSubsampling6,
+    "conv2d8": Conv2dSubsampling8,
+    'paraformer_dummy': torch.nn.Identity
+}
+
+COSYVOICE_EMB_CLASSES = {
+    "embed": PositionalEncoding,
+    "abs_pos": PositionalEncoding,
+    "rel_pos": RelPositionalEncoding,
+    "rel_pos_espnet": EspnetRelPositionalEncoding,
+    "no_pos": NoPositionalEncoding,
+    "abs_pos_whisper": WhisperPositionalEncoding,
+    "embed_learnable_pe": LearnablePositionalEncoding,
+}
+
+COSYVOICE_ATTENTION_CLASSES = {
+    "selfattn": MultiHeadedAttention,
+    "rel_selfattn": RelPositionMultiHeadedAttention,
+}

src/chatterbox/models/s3gen/utils/mask.py

@@ -0,0 +1,193 @@
+# Copyright (c) 2019 Shigeki Karita
+#               2020 Mobvoi Inc (Binbin Zhang)
+#               2024 Alibaba Inc (authors: Xiang Lyu)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import torch
+
+'''
+def subsequent_mask(
+        size: int,
+        device: torch.device = torch.device("cpu"),
+) -> torch.Tensor:
+    """Create mask for subsequent steps (size, size).
+
+    This mask is used only in decoder which works in an auto-regressive mode.
+    This means the current step could only do attention with its left steps.
+
+    In encoder, fully attention is used when streaming is not necessary and
+    the sequence is not long. In this  case, no attention mask is needed.
+
+    When streaming is need, chunk-based attention is used in encoder. See
+    subsequent_chunk_mask for the chunk-based attention mask.
+
+    Args:
+        size (int): size of mask
+        str device (str): "cpu" or "cuda" or torch.Tensor.device
+        dtype (torch.device): result dtype
+
+    Returns:
+        torch.Tensor: mask
+
+    Examples:
+        >>> subsequent_mask(3)
+        [[1, 0, 0],
+         [1, 1, 0],
+         [1, 1, 1]]
+    """
+    ret = torch.ones(size, size, device=device, dtype=torch.bool)
+    return torch.tril(ret)
+'''
+
+
+def subsequent_chunk_mask(
+        size: int,
+        chunk_size: int,
+        num_left_chunks: int = -1,
+        device: torch.device = torch.device("cpu"),
+) -> torch.Tensor:
+    """Create mask for subsequent steps (size, size) with chunk size,
+       this is for streaming encoder
+
+    Args:
+        size (int): size of mask
+        chunk_size (int): size of chunk
+        num_left_chunks (int): number of left chunks
+            <0: use full chunk
+            >=0: use num_left_chunks
+        device (torch.device): "cpu" or "cuda" or torch.Tensor.device
+
+    Returns:
+        torch.Tensor: mask
+
+    Examples:
+        >>> subsequent_chunk_mask(4, 2)
+        [[1, 1, 0, 0],
+         [1, 1, 0, 0],
+         [1, 1, 1, 1],
+         [1, 1, 1, 1]]
+    """
+    # NOTE this modified implementation meets onnx export requirements, but it doesn't support num_left_chunks
+    # actually this is not needed after we have inference cache implemented, will remove it later
+    pos_idx = torch.arange(size, device=device)
+    block_value = (torch.div(pos_idx, chunk_size, rounding_mode='trunc') + 1) * chunk_size
+    ret = pos_idx.unsqueeze(0) < block_value.unsqueeze(1)
+    return ret
+
+
+def add_optional_chunk_mask(xs: torch.Tensor,
+                            masks: torch.Tensor,
+                            use_dynamic_chunk: bool,
+                            use_dynamic_left_chunk: bool,
+                            decoding_chunk_size: int,
+                            static_chunk_size: int,
+                            num_decoding_left_chunks: int,
+                            enable_full_context: bool = True):
+    """ Apply optional mask for encoder.
+
+    Args:
+        xs (torch.Tensor): padded input, (B, L, D), L for max length
+        mask (torch.Tensor): mask for xs, (B, 1, L)
+        use_dynamic_chunk (bool): whether to use dynamic chunk or not
+        use_dynamic_left_chunk (bool): whether to use dynamic left chunk for
+            training.
+        decoding_chunk_size (int): decoding chunk size for dynamic chunk, it's
+            0: default for training, use random dynamic chunk.
+            <0: for decoding, use full chunk.
+            >0: for decoding, use fixed chunk size as set.
+        static_chunk_size (int): chunk size for static chunk training/decoding
+            if it's greater than 0, if use_dynamic_chunk is true,
+            this parameter will be ignored
+        num_decoding_left_chunks: number of left chunks, this is for decoding,
+            the chunk size is decoding_chunk_size.
+            >=0: use num_decoding_left_chunks
+            <0: use all left chunks
+        enable_full_context (bool):
+            True: chunk size is either [1, 25] or full context(max_len)
+            False: chunk size ~ U[1, 25]
+
+    Returns:
+        torch.Tensor: chunk mask of the input xs.
+    """
+    # Whether to use chunk mask or not
+    if use_dynamic_chunk:
+        max_len = xs.size(1)
+        if decoding_chunk_size < 0:
+            chunk_size = max_len
+            num_left_chunks = -1
+        elif decoding_chunk_size > 0:
+            chunk_size = decoding_chunk_size
+            num_left_chunks = num_decoding_left_chunks
+        else:
+            # chunk size is either [1, 25] or full context(max_len).
+            # Since we use 4 times subsampling and allow up to 1s(100 frames)
+            # delay, the maximum frame is 100 / 4 = 25.
+            chunk_size = torch.randint(1, max_len, (1, )).item()
+            num_left_chunks = -1
+            if chunk_size > max_len // 2 and enable_full_context:
+                chunk_size = max_len
+            else:
+                chunk_size = chunk_size % 25 + 1
+                if use_dynamic_left_chunk:
+                    max_left_chunks = (max_len - 1) // chunk_size
+                    num_left_chunks = torch.randint(0, max_left_chunks,
+                                                    (1, )).item()
+        chunk_masks = subsequent_chunk_mask(xs.size(1), chunk_size,
+                                            num_left_chunks,
+                                            xs.device)  # (L, L)
+        chunk_masks = chunk_masks.unsqueeze(0)  # (1, L, L)
+        chunk_masks = masks & chunk_masks  # (B, L, L)
+    elif static_chunk_size > 0:
+        num_left_chunks = num_decoding_left_chunks
+        chunk_masks = subsequent_chunk_mask(xs.size(1), static_chunk_size,
+                                            num_left_chunks,
+                                            xs.device)  # (L, L)
+        chunk_masks = chunk_masks.unsqueeze(0)  # (1, L, L)
+        chunk_masks = masks & chunk_masks  # (B, L, L)
+    else:
+        chunk_masks = masks
+    assert chunk_masks.dtype == torch.bool
+    if (chunk_masks.sum(dim=-1) == 0).sum().item() != 0:
+        logging.warning('get chunk_masks all false at some timestep, force set to true, make sure they are masked in futuer computation!')
+        chunk_masks[chunk_masks.sum(dim=-1)==0] = True
+    return chunk_masks
+
+
+def make_pad_mask(lengths: torch.Tensor, max_len: int = 0) -> torch.Tensor:
+    """Make mask tensor containing indices of padded part.
+
+    See description of make_non_pad_mask.
+
+    Args:
+        lengths (torch.Tensor): Batch of lengths (B,).
+    Returns:
+        torch.Tensor: Mask tensor containing indices of padded part.
+
+    Examples:
+        >>> lengths = [5, 3, 2]
+        >>> make_pad_mask(lengths)
+        masks = [[0, 0, 0, 0 ,0],
+                 [0, 0, 0, 1, 1],
+                 [0, 0, 1, 1, 1]]
+    """
+    batch_size = lengths.size(0)
+    max_len = max_len if max_len > 0 else lengths.max().item()
+    seq_range = torch.arange(0,
+                             max_len,
+                             dtype=torch.int64,
+                             device=lengths.device)
+    seq_range_expand = seq_range.unsqueeze(0).expand(batch_size, max_len)
+    seq_length_expand = lengths.unsqueeze(-1)
+    mask = seq_range_expand >= seq_length_expand
+    return mask

src/chatterbox/models/s3gen/utils/mel.py

@@ -0,0 +1,81 @@
+"""mel-spectrogram extraction in Matcha-TTS"""
+from librosa.filters import mel as librosa_mel_fn
+import torch
+import numpy as np
+
+
+# NOTE: they decalred these global vars
+mel_basis = {}
+hann_window = {}
+
+
+def dynamic_range_compression_torch(x, C=1, clip_val=1e-5):
+    return torch.log(torch.clamp(x, min=clip_val) * C)
+
+
+def spectral_normalize_torch(magnitudes):
+    output = dynamic_range_compression_torch(magnitudes)
+    return output
+
+"""
+feat_extractor: !name:matcha.utils.audio.mel_spectrogram
+    n_fft: 1920
+    num_mels: 80
+    sampling_rate: 24000
+    hop_size: 480
+    win_size: 1920
+    fmin: 0
+    fmax: 8000
+    center: False
+
+"""
+
+def mel_spectrogram(y, n_fft=1920, num_mels=80, sampling_rate=24000, hop_size=480, win_size=1920,
+                    fmin=0, fmax=8000, center=False):
+    """Copied from https://github.com/shivammehta25/Matcha-TTS/blob/main/matcha/utils/audio.py
+    Set default values according to Cosyvoice's config.
+    """
+
+    if isinstance(y, np.ndarray):
+        y = torch.tensor(y).float()
+
+    if len(y.shape) == 1:
+        y = y[None, ]
+
+    if torch.min(y) < -1.0:
+        print("min value is ", torch.min(y))
+    if torch.max(y) > 1.0:
+        print("max value is ", torch.max(y))
+
+    global mel_basis, hann_window  # pylint: disable=global-statement,global-variable-not-assigned
+    if f"{str(fmax)}_{str(y.device)}" not in mel_basis:
+        mel = librosa_mel_fn(sr=sampling_rate, n_fft=n_fft, n_mels=num_mels, fmin=fmin, fmax=fmax)
+        mel_basis[str(fmax) + "_" + str(y.device)] = torch.from_numpy(mel).float().to(y.device)
+        hann_window[str(y.device)] = torch.hann_window(win_size).to(y.device)
+
+    y = torch.nn.functional.pad(
+        y.unsqueeze(1), (int((n_fft - hop_size) / 2), int((n_fft - hop_size) / 2)), mode="reflect"
+    )
+    y = y.squeeze(1)
+
+    spec = torch.view_as_real(
+        torch.stft(
+            y,
+            n_fft,
+            hop_length=hop_size,
+            win_length=win_size,
+            window=hann_window[str(y.device)],
+            center=center,
+            pad_mode="reflect",
+            normalized=False,
+            onesided=True,
+            return_complex=True,
+        )
+    )
+
+    spec = torch.sqrt(spec.pow(2).sum(-1) + (1e-9))
+
+    spec = torch.matmul(mel_basis[str(fmax) + "_" + str(y.device)], spec)
+    spec = spectral_normalize_torch(spec)
+
+    return spec

src/chatterbox/models/s3gen/xvector.py

@@ -0,0 +1,428 @@
+#!/usr/bin/env python3
+# -*- encoding: utf-8 -*-
+# Copyright FunASR (https://github.com/alibaba-damo-academy/FunASR). All Rights Reserved.
+#  MIT License  (https://opensource.org/licenses/MIT)
+# Modified from 3D-Speaker (https://github.com/alibaba-damo-academy/3D-Speaker)
+
+
+from collections import OrderedDict
+import torch
+import torch.nn.functional as F
+import torch.utils.checkpoint as cp
+import torchaudio.compliance.kaldi as Kaldi
+
+
+def pad_list(xs, pad_value):
+    """Perform padding for the list of tensors.
+
+    Args:
+        xs (List): List of Tensors [(T_1, `*`), (T_2, `*`), ..., (T_B, `*`)].
+        pad_value (float): Value for padding.
+
+    Returns:
+        Tensor: Padded tensor (B, Tmax, `*`).
+
+    Examples:
+        >>> x = [torch.ones(4), torch.ones(2), torch.ones(1)]
+        >>> x
+        [tensor([1., 1., 1., 1.]), tensor([1., 1.]), tensor([1.])]
+        >>> pad_list(x, 0)
+        tensor([[1., 1., 1., 1.],
+                [1., 1., 0., 0.],
+                [1., 0., 0., 0.]])
+
+    """
+    n_batch = len(xs)
+    max_len = max(x.size(0) for x in xs)
+    pad = xs[0].new(n_batch, max_len, *xs[0].size()[1:]).fill_(pad_value)
+
+    for i in range(n_batch):
+        pad[i, : xs[i].size(0)] = xs[i]
+
+    return pad
+
+
+def extract_feature(audio):
+    features = []
+    feature_times = []
+    feature_lengths = []
+    for au in audio:
+        feature = Kaldi.fbank(au.unsqueeze(0), num_mel_bins=80)
+        feature = feature - feature.mean(dim=0, keepdim=True)
+        features.append(feature)
+        feature_times.append(au.shape[0])
+        feature_lengths.append(feature.shape[0])
+    # padding for batch inference
+    features_padded = pad_list(features, pad_value=0)
+    # features = torch.cat(features)
+    return features_padded, feature_lengths, feature_times
+
+
+class BasicResBlock(torch.nn.Module):
+    expansion = 1
+
+    def __init__(self, in_planes, planes, stride=1):
+        super(BasicResBlock, self).__init__()
+        self.conv1 = torch.nn.Conv2d(
+            in_planes, planes, kernel_size=3, stride=(stride, 1), padding=1, bias=False
+        )
+        self.bn1 = torch.nn.BatchNorm2d(planes)
+        self.conv2 = torch.nn.Conv2d(planes, planes, kernel_size=3, stride=1, padding=1, bias=False)
+        self.bn2 = torch.nn.BatchNorm2d(planes)
+
+        self.shortcut = torch.nn.Sequential()
+        if stride != 1 or in_planes != self.expansion * planes:
+            self.shortcut = torch.nn.Sequential(
+                torch.nn.Conv2d(
+                    in_planes,
+                    self.expansion * planes,
+                    kernel_size=1,
+                    stride=(stride, 1),
+                    bias=False,
+                ),
+                torch.nn.BatchNorm2d(self.expansion * planes),
+            )
+
+    def forward(self, x):
+        out = F.relu(self.bn1(self.conv1(x)))
+        out = self.bn2(self.conv2(out))
+        out += self.shortcut(x)
+        out = F.relu(out)
+        return out
+
+
+class FCM(torch.nn.Module):
+    def __init__(self, block=BasicResBlock, num_blocks=[2, 2], m_channels=32, feat_dim=80):
+        super(FCM, self).__init__()
+        self.in_planes = m_channels
+        self.conv1 = torch.nn.Conv2d(1, m_channels, kernel_size=3, stride=1, padding=1, bias=False)
+        self.bn1 = torch.nn.BatchNorm2d(m_channels)
+
+        self.layer1 = self._make_layer(block, m_channels, num_blocks[0], stride=2)
+        self.layer2 = self._make_layer(block, m_channels, num_blocks[0], stride=2)
+
+        self.conv2 = torch.nn.Conv2d(
+            m_channels, m_channels, kernel_size=3, stride=(2, 1), padding=1, bias=False
+        )
+        self.bn2 = torch.nn.BatchNorm2d(m_channels)
+        self.out_channels = m_channels * (feat_dim // 8)
+
+    def _make_layer(self, block, planes, num_blocks, stride):
+        strides = [stride] + [1] * (num_blocks - 1)
+        layers = []
+        for stride in strides:
+            layers.append(block(self.in_planes, planes, stride))
+            self.in_planes = planes * block.expansion
+        return torch.nn.Sequential(*layers)
+
+    def forward(self, x):
+        x = x.unsqueeze(1)
+        out = F.relu(self.bn1(self.conv1(x)))
+        out = self.layer1(out)
+        out = self.layer2(out)
+        out = F.relu(self.bn2(self.conv2(out)))
+
+        shape = out.shape
+        out = out.reshape(shape[0], shape[1] * shape[2], shape[3])
+        return out
+
+
+def get_nonlinear(config_str, channels):
+    nonlinear = torch.nn.Sequential()
+    for name in config_str.split("-"):
+        if name == "relu":
+            nonlinear.add_module("relu", torch.nn.ReLU(inplace=True))
+        elif name == "prelu":
+            nonlinear.add_module("prelu", torch.nn.PReLU(channels))
+        elif name == "batchnorm":
+            nonlinear.add_module("batchnorm", torch.nn.BatchNorm1d(channels))
+        elif name == "batchnorm_":
+            nonlinear.add_module("batchnorm", torch.nn.BatchNorm1d(channels, affine=False))
+        else:
+            raise ValueError("Unexpected module ({}).".format(name))
+    return nonlinear
+
+
+def statistics_pooling(x, dim=-1, keepdim=False, unbiased=True, eps=1e-2):
+    mean = x.mean(dim=dim)
+    std = x.std(dim=dim, unbiased=unbiased)
+    stats = torch.cat([mean, std], dim=-1)
+    if keepdim:
+        stats = stats.unsqueeze(dim=dim)
+    return stats
+
+
+class StatsPool(torch.nn.Module):
+    def forward(self, x):
+        return statistics_pooling(x)
+
+
+class TDNNLayer(torch.nn.Module):
+    def __init__(
+        self,
+        in_channels,
+        out_channels,
+        kernel_size,
+        stride=1,
+        padding=0,
+        dilation=1,
+        bias=False,
+        config_str="batchnorm-relu",
+    ):
+        super(TDNNLayer, self).__init__()
+        if padding < 0:
+            assert (
+                kernel_size % 2 == 1
+            ), "Expect equal paddings, but got even kernel size ({})".format(kernel_size)
+            padding = (kernel_size - 1) // 2 * dilation
+        self.linear = torch.nn.Conv1d(
+            in_channels,
+            out_channels,
+            kernel_size,
+            stride=stride,
+            padding=padding,
+            dilation=dilation,
+            bias=bias,
+        )
+        self.nonlinear = get_nonlinear(config_str, out_channels)
+
+    def forward(self, x):
+        x = self.linear(x)
+        x = self.nonlinear(x)
+        return x
+
+
+class CAMLayer(torch.nn.Module):
+    def __init__(
+        self, bn_channels, out_channels, kernel_size, stride, padding, dilation, bias, reduction=2
+    ):
+        super(CAMLayer, self).__init__()
+        self.linear_local = torch.nn.Conv1d(
+            bn_channels,
+            out_channels,
+            kernel_size,
+            stride=stride,
+            padding=padding,
+            dilation=dilation,
+            bias=bias,
+        )
+        self.linear1 = torch.nn.Conv1d(bn_channels, bn_channels // reduction, 1)
+        self.relu = torch.nn.ReLU(inplace=True)
+        self.linear2 = torch.nn.Conv1d(bn_channels // reduction, out_channels, 1)
+        self.sigmoid = torch.nn.Sigmoid()
+
+    def forward(self, x):
+        y = self.linear_local(x)
+        context = x.mean(-1, keepdim=True) + self.seg_pooling(x)
+        context = self.relu(self.linear1(context))
+        m = self.sigmoid(self.linear2(context))
+        return y * m
+
+    def seg_pooling(self, x, seg_len=100, stype="avg"):
+        if stype == "avg":
+            seg = F.avg_pool1d(x, kernel_size=seg_len, stride=seg_len, ceil_mode=True)
+        elif stype == "max":
+            seg = F.max_pool1d(x, kernel_size=seg_len, stride=seg_len, ceil_mode=True)
+        else:
+            raise ValueError("Wrong segment pooling type.")
+        shape = seg.shape
+        seg = seg.unsqueeze(-1).expand(*shape, seg_len).reshape(*shape[:-1], -1)
+        seg = seg[..., : x.shape[-1]]
+        return seg
+
+
+class CAMDenseTDNNLayer(torch.nn.Module):
+    def __init__(
+        self,
+        in_channels,
+        out_channels,
+        bn_channels,
+        kernel_size,
+        stride=1,
+        dilation=1,
+        bias=False,
+        config_str="batchnorm-relu",
+        memory_efficient=False,
+    ):
+        super(CAMDenseTDNNLayer, self).__init__()
+        assert kernel_size % 2 == 1, "Expect equal paddings, but got even kernel size ({})".format(
+            kernel_size
+        )
+        padding = (kernel_size - 1) // 2 * dilation
+        self.memory_efficient = memory_efficient
+        self.nonlinear1 = get_nonlinear(config_str, in_channels)
+        self.linear1 = torch.nn.Conv1d(in_channels, bn_channels, 1, bias=False)
+        self.nonlinear2 = get_nonlinear(config_str, bn_channels)
+        self.cam_layer = CAMLayer(
+            bn_channels,
+            out_channels,
+            kernel_size,
+            stride=stride,
+            padding=padding,
+            dilation=dilation,
+            bias=bias,
+        )
+
+    def bn_function(self, x):
+        return self.linear1(self.nonlinear1(x))
+
+    def forward(self, x):
+        if self.training and self.memory_efficient:
+            x = cp.checkpoint(self.bn_function, x)
+        else:
+            x = self.bn_function(x)
+        x = self.cam_layer(self.nonlinear2(x))
+        return x
+
+
+class CAMDenseTDNNBlock(torch.nn.ModuleList):
+    def __init__(
+        self,
+        num_layers,
+        in_channels,
+        out_channels,
+        bn_channels,
+        kernel_size,
+        stride=1,
+        dilation=1,
+        bias=False,
+        config_str="batchnorm-relu",
+        memory_efficient=False,
+    ):
+        super(CAMDenseTDNNBlock, self).__init__()
+        for i in range(num_layers):
+            layer = CAMDenseTDNNLayer(
+                in_channels=in_channels + i * out_channels,
+                out_channels=out_channels,
+                bn_channels=bn_channels,
+                kernel_size=kernel_size,
+                stride=stride,
+                dilation=dilation,
+                bias=bias,
+                config_str=config_str,
+                memory_efficient=memory_efficient,
+            )
+            self.add_module("tdnnd%d" % (i + 1), layer)
+
+    def forward(self, x):
+        for layer in self:
+            x = torch.cat([x, layer(x)], dim=1)
+        return x
+
+
+class TransitLayer(torch.nn.Module):
+    def __init__(self, in_channels, out_channels, bias=True, config_str="batchnorm-relu"):
+        super(TransitLayer, self).__init__()
+        self.nonlinear = get_nonlinear(config_str, in_channels)
+        self.linear = torch.nn.Conv1d(in_channels, out_channels, 1, bias=bias)
+
+    def forward(self, x):
+        x = self.nonlinear(x)
+        x = self.linear(x)
+        return x
+
+
+class DenseLayer(torch.nn.Module):
+    def __init__(self, in_channels, out_channels, bias=False, config_str="batchnorm-relu"):
+        super(DenseLayer, self).__init__()
+        self.linear = torch.nn.Conv1d(in_channels, out_channels, 1, bias=bias)
+        self.nonlinear = get_nonlinear(config_str, out_channels)
+
+    def forward(self, x):
+        if len(x.shape) == 2:
+            x = self.linear(x.unsqueeze(dim=-1)).squeeze(dim=-1)
+        else:
+            x = self.linear(x)
+        x = self.nonlinear(x)
+        return x
+
+# @tables.register("model_classes", "CAMPPlus")
+class CAMPPlus(torch.nn.Module):
+    def __init__(
+        self,
+        feat_dim=80,
+        embedding_size=192,
+        growth_rate=32,
+        bn_size=4,
+        init_channels=128,
+        config_str="batchnorm-relu",
+        memory_efficient=True,
+        output_level="segment",
+        **kwargs,
+    ):
+        super().__init__()
+
+        self.head = FCM(feat_dim=feat_dim)
+        channels = self.head.out_channels
+        self.output_level = output_level
+
+        self.xvector = torch.nn.Sequential(
+            OrderedDict(
+                [
+                    (
+                        "tdnn",
+                        TDNNLayer(
+                            channels,
+                            init_channels,
+                            5,
+                            stride=2,
+                            dilation=1,
+                            padding=-1,
+                            config_str=config_str,
+                        ),
+                    ),
+                ]
+            )
+        )
+        channels = init_channels
+        for i, (num_layers, kernel_size, dilation) in enumerate(
+            zip((12, 24, 16), (3, 3, 3), (1, 2, 2))
+        ):
+            block = CAMDenseTDNNBlock(
+                num_layers=num_layers,
+                in_channels=channels,
+                out_channels=growth_rate,
+                bn_channels=bn_size * growth_rate,
+                kernel_size=kernel_size,
+                dilation=dilation,
+                config_str=config_str,
+                memory_efficient=memory_efficient,
+            )
+            self.xvector.add_module("block%d" % (i + 1), block)
+            channels = channels + num_layers * growth_rate
+            self.xvector.add_module(
+                "transit%d" % (i + 1),
+                TransitLayer(channels, channels // 2, bias=False, config_str=config_str),
+            )
+            channels //= 2
+
+        self.xvector.add_module("out_nonlinear", get_nonlinear(config_str, channels))
+
+        if self.output_level == "segment":
+            self.xvector.add_module("stats", StatsPool())
+            self.xvector.add_module(
+                "dense", DenseLayer(channels * 2, embedding_size, config_str="batchnorm_")
+            )
+        else:
+            assert (
+                self.output_level == "frame"
+            ), "`output_level` should be set to 'segment' or 'frame'. "
+
+        for m in self.modules():
+            if isinstance(m, (torch.nn.Conv1d, torch.nn.Linear)):
+                torch.nn.init.kaiming_normal_(m.weight.data)
+                if m.bias is not None:
+                    torch.nn.init.zeros_(m.bias)
+
+    def forward(self, x):
+        x = x.permute(0, 2, 1)  # (B,T,F) => (B,F,T)
+        x = self.head(x)
+        x = self.xvector(x)
+        if self.output_level == "frame":
+            x = x.transpose(1, 2)
+        return x
+
+    def inference(self, audio_list):
+        speech, speech_lengths, speech_times = extract_feature(audio_list)
+        results = self.forward(speech.to(torch.float32))
+        return results

src/chatterbox/models/s3tokenizer/__init__.py

@@ -0,0 +1,30 @@
+from .s3tokenizer import (
+    S3_SR,
+    S3_HOP,
+    S3_TOKEN_HOP,
+    S3_TOKEN_RATE,
+    SPEECH_VOCAB_SIZE,
+    S3Tokenizer,
+)
+
+
+SOS = SPEECH_VOCAB_SIZE
+EOS = SPEECH_VOCAB_SIZE + 1
+
+
+
+def drop_invalid_tokens(x):
+    """Drop SoS and EoS"""
+    assert len(x.shape) == 1 or (len(x.shape) == 2 and x.shape[0] == 1), "only batch size of one allowed for now"
+    if SOS in x:
+        s = (x == SOS).nonzero(as_tuple=True)[0].squeeze(0) + 1
+    else:
+        s = 0
+
+    if EOS in x:
+        e = (x == EOS).nonzero(as_tuple=True)[0].squeeze(0)
+    else:
+        e = None
+
+    x = x[s: e]
+    return x

src/chatterbox/models/s3tokenizer/s3tokenizer.py

@@ -0,0 +1,168 @@
+from typing import List, Tuple
+
+import numpy as np
+import librosa
+import torch
+import torch.nn.functional as F
+from s3tokenizer.utils import padding
+from s3tokenizer.model_v2 import (
+    S3TokenizerV2,
+    ModelConfig,
+)
+
+
+# Sampling rate of the inputs to S3TokenizerV2
+S3_SR = 16_000
+S3_HOP = 160  # 100 frames/sec
+S3_TOKEN_HOP = 640  # 25 tokens/sec
+S3_TOKEN_RATE = 25
+SPEECH_VOCAB_SIZE = 6561
+
+
+class S3Tokenizer(S3TokenizerV2):
+    """
+    s3tokenizer.S3TokenizerV2 with the following changes:
+    - a more integrated `forward`
+    - compute `log_mel_spectrogram` using `_mel_filters` and `window` in `register_buffers`
+    """
+
+    ignore_state_dict_missing = ("_mel_filters", "window")
+
+    def __init__(
+        self,
+        name: str="speech_tokenizer_v2_25hz",
+        config: ModelConfig = ModelConfig()
+    ):
+        super().__init__(name)
+
+        self.n_fft = 400
+        _mel_filters = librosa.filters.mel(
+            sr=S3_SR,
+            n_fft=self.n_fft,
+            n_mels=config.n_mels
+        )
+        self.register_buffer(
+            "_mel_filters",
+            torch.FloatTensor(_mel_filters),
+        )
+
+        self.register_buffer(
+            "window",
+            torch.hann_window(self.n_fft),
+        )
+
+    def pad(self, wavs, sr) -> List[torch.Tensor]:
+        """
+        Given a list of wavs with the same `sample_rate`, pad them so that the length is multiple of 40ms (S3 runs at 25 token/sec).
+        """
+        processed_wavs = []
+        for wav in wavs:
+            if isinstance(wav, np.ndarray):
+                wav = torch.from_numpy(wav)
+            if wav.dim() == 1:
+                wav = wav.unsqueeze(0)
+
+            n_tokens = (wav.shape[1] / sr) * S3_TOKEN_RATE
+            n_tokens = np.ceil(n_tokens)
+            intended_wav_len = n_tokens * (sr / S3_TOKEN_RATE)
+            intended_wav_len = int(intended_wav_len)
+            wav = torch.nn.functional.pad(
+                wav,
+                (0, intended_wav_len - wav.shape[-1]),
+                mode="constant",
+                value=0
+            )
+            processed_wavs.append(wav)
+        return processed_wavs
+
+    def _prepare_audio(self, wavs):
+        """Prepare a list of audios for s3tokenizer processing."""
+        processed_wavs = []
+        for wav in wavs:
+            if isinstance(wav, np.ndarray):
+                wav = torch.from_numpy(wav)
+            if wav.dim() == 1:
+                wav = wav.unsqueeze(0)
+
+            processed_wavs.append(wav)
+        return processed_wavs
+
+    @torch.no_grad()
+    def forward(
+        self,
+        wavs: torch.Tensor,
+        accelerator: 'Accelerator'=None,
+        max_len: int=None,
+    ) -> Tuple[torch.Tensor, torch.LongTensor]:
+        """
+        NOTE: mel-spec has a hop size of 160 points (100 frame/sec).
+        FIXME: this class inherits `nn.Module` but doesn't accept `torch.Tensor` and handles a list of wavs one by one, which is unexpected.
+
+        Args
+        ----
+        - `wavs`: 16 kHz speech audio
+        - `max_len` max length to truncate the output sequence to (25 token/sec).
+        NOTE: please pad the waveform if longer sequence is needed.
+        """
+        processed_wavs = self._prepare_audio(wavs)
+        mels, mel_lens = [], []
+        for wav in processed_wavs:
+            wav = wav.to(self.device)
+            mel = self.log_mel_spectrogram(wav)  # [B=1, F, T]
+            if max_len is not None:
+                mel = mel[..., :max_len * 4]  # num_mel_frames = 4 * num_tokens
+            mels.append(mel.squeeze(0))
+
+        mels, mel_lens = padding(mels)
+        if accelerator is None:
+            tokenizer = self
+        else:
+            tokenizer = accelerator.unwrap_model(self)
+
+        speech_tokens, speech_token_lens = tokenizer.quantize(mels, mel_lens.to(self.device))
+        return (
+            speech_tokens.long().detach(),
+            speech_token_lens.long().detach(),
+        )
+
+    def log_mel_spectrogram(
+        self,
+        audio: torch.Tensor,
+        padding: int = 0,
+    ):
+        """
+        Compute the log-Mel spectrogram of
+
+        Parameters
+        ----------
+        audio: torch.Tensor, shape = (*)
+            The path to audio or either a NumPy array or Tensor containing the
+            audio waveform in 16 kHz
+
+        padding: int
+            Number of zero samples to pad to the right
+
+        Returns
+        -------
+        torch.Tensor, shape = (128, n_frames)
+            A Tensor that contains the Mel spectrogram
+        """
+        if not torch.is_tensor(audio):
+            audio = torch.from_numpy(audio)
+
+        audio = audio.to(self.device)
+        if padding > 0:
+            audio = F.pad(audio, (0, padding))
+        stft = torch.stft(
+            audio, self.n_fft, S3_HOP,
+            window=self.window.to(self.device),
+            return_complex=True
+        )
+        magnitudes = stft[..., :-1].abs()**2
+
+        mel_spec = self._mel_filters.to(self.device) @ magnitudes
+
+        log_spec = torch.clamp(mel_spec, min=1e-10).log10()
+        log_spec = torch.maximum(log_spec, log_spec.max() - 8.0)
+        log_spec = (log_spec + 4.0) / 4.0
+        return log_spec

src/chatterbox/models/t3/__init__.py

@@ -0,0 +1 @@
+from .t3 import T3

src/chatterbox/models/t3/inference/alignment_stream_analyzer.py

@@ -0,0 +1,154 @@
+# Copyright (c) 2025 Resemble AI
+# Author: John Meade, Jeremy Hsu
+# MIT License
+import logging
+import torch
+from dataclasses import dataclass
+from types import MethodType
+
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class AlignmentAnalysisResult:
+    # was this frame detected as being part of a noisy beginning chunk with potential hallucinations?
+    false_start: bool
+    # was this frame detected as being part of a long tail with potential hallucinations?
+    long_tail: bool
+    # was this frame detected as repeating existing text content?
+    repetition: bool
+    # was the alignment position of this frame too far from the previous frame?
+    discontinuity: bool
+    # has inference reached the end of the text tokens? eg, this remains false if inference stops early
+    complete: bool
+    # approximate position in the text token sequence. Can be used for generating online timestamps.
+    position: int
+
+
+class AlignmentStreamAnalyzer:
+    def __init__(self, tfmr, queue, text_tokens_slice, alignment_layer_idx=9, eos_idx=0):
+        """
+        Some transformer TTS models implicitly solve text-speech alignment in one or more of their self-attention
+        activation maps. This module exploits this to perform online integrity checks which streaming.
+        A hook is injected into the specified attention layer, and heuristics are used to determine alignment
+        position, repetition, etc.
+
+        NOTE: currently requires no queues.
+        """
+        # self.queue = queue
+        self.text_tokens_slice = (i, j) = text_tokens_slice
+        self.eos_idx = eos_idx
+        self.alignment = torch.zeros(0, j-i)
+        # self.alignment_bin = torch.zeros(0, j-i)
+        self.curr_frame_pos = 0
+        self.text_position = 0
+
+        self.started = False
+        self.started_at = None
+
+        self.complete = False
+        self.completed_at = None
+
+        # Using `output_attentions=True` is incompatible with optimized attention kernels, so
+        # using it for all layers slows things down too much. We can apply it to just one layer
+        # by intercepting the kwargs and adding a forward hook (credit: jrm)
+        self.last_aligned_attn = None
+        self._add_attention_spy(tfmr, alignment_layer_idx)
+
+    def _add_attention_spy(self, tfmr, alignment_layer_idx):
+        """
+        Adds a forward hook to a specific attention layer to collect outputs.
+        Using `output_attentions=True` is incompatible with optimized attention kernels, so
+        using it for all layers slows things down too much.
+        (credit: jrm)
+        """
+
+        def attention_forward_hook(module, input, output):
+            """
+            See `LlamaAttention.forward`; the output is a 3-tuple: `attn_output, attn_weights, past_key_value`.
+            NOTE:
+            - When `output_attentions=True`, `LlamaSdpaAttention.forward` calls `LlamaAttention.forward`.
+            - `attn_output` has shape [B, H, T0, T0] for the 0th entry, and [B, H, 1, T0+i] for the rest i-th.
+            """
+            step_attention = output[1].cpu() # (B, 16, N, N)
+            self.last_aligned_attn = step_attention[0].mean(0) # (N, N)
+
+        target_layer = tfmr.layers[alignment_layer_idx].self_attn
+        hook_handle = target_layer.register_forward_hook(attention_forward_hook)
+
+        # Backup original forward
+        original_forward = target_layer.forward
+        def patched_forward(self, *args, **kwargs):
+            kwargs['output_attentions'] = True
+            return original_forward(*args, **kwargs)
+
+        # TODO: how to unpatch it?
+        target_layer.forward = MethodType(patched_forward, target_layer)
+
+    def step(self, logits):
+        """
+        Emits an AlignmentAnalysisResult into the output queue, and potentially modifies the logits to force an EOS.
+        """
+        # extract approximate alignment matrix chunk (1 frame at a time after the first chunk)
+        aligned_attn = self.last_aligned_attn # (N, N)
+        i, j = self.text_tokens_slice
+        if self.curr_frame_pos == 0:
+            # first chunk has conditioning info, text tokens, and BOS token
+            A_chunk = aligned_attn[j:, i:j].clone().cpu() # (T, S)
+        else:
+            # subsequent chunks have 1 frame due to KV-caching
+            A_chunk = aligned_attn[:, i:j].clone().cpu() # (1, S)
+
+        # TODO: monotonic masking; could have issue b/c spaces are often skipped.
+        A_chunk[:, self.curr_frame_pos + 1:] = 0
+
+
+        self.alignment = torch.cat((self.alignment, A_chunk), dim=0)
+
+        A = self.alignment
+        T, S = A.shape
+
+        # update position
+        cur_text_posn = A_chunk[-1].argmax()
+        discontinuity = not(-4 < cur_text_posn - self.text_position < 7) # NOTE: very lenient!
+        if not discontinuity:
+            self.text_position = cur_text_posn
+
+        # Hallucinations at the start of speech show up as activations at the bottom of the attention maps!
+        # To mitigate this, we just wait until there are no activations far off-diagonal in the last 2 tokens,
+        # and there are some strong activations in the first few tokens.
+        false_start = (not self.started) and (A[-2:, -2:].max() > 0.1 or A[:, :4].max() < 0.5)
+        self.started = not false_start
+        if self.started and self.started_at is None:
+            self.started_at = T
+
+        # Is generation likely complete?
+        self.complete = self.complete or self.text_position >= S - 3
+        if self.complete and self.completed_at is None:
+            self.completed_at = T
+
+        # NOTE: EOS rarely assigned activations, and second-last token is often punctuation, so use last 3 tokens.
+        # NOTE: due to the false-start behaviour, we need to make sure we skip activations for the first few tokens.
+        last_text_token_duration = A[15:, -3:].sum()
+
+        # Activations for the final token that last too long are likely hallucinations.
+        long_tail = self.complete and (A[self.completed_at:, -3:].sum(dim=0).max() >= 10) # 400ms
+
+        # If there are activations in previous tokens after generation has completed, assume this is a repetition error.
+        repetition = self.complete and (A[self.completed_at:, :-5].max(dim=1).values.sum() > 5)
+
+        # If a bad ending is detected, force emit EOS by modifying logits
+        # NOTE: this means logits may be inconsistent with latents!
+        if long_tail or repetition:
+            logger.warn(f"forcing EOS token, {long_tail=}, {repetition=}")
+            # (±2**15 is safe for all dtypes >= 16bit)
+            logits = -(2**15) * torch.ones_like(logits)
+            logits[..., self.eos_idx] = 2**15
+
+        # Suppress EoS to prevent early termination
+        if cur_text_posn < S - 3: # FIXME: arbitrary
+            logits[..., self.eos_idx] = -2**15
+
+        self.curr_frame_pos += 1
+        return logits

src/chatterbox/models/t3/inference/t3_hf_backend.py

@@ -0,0 +1,116 @@
+from typing import Optional
+
+import torch
+from torch import nn as nn
+from transformers import LlamaConfig, LlamaModel, LlamaPreTrainedModel, GenerationMixin
+from transformers.modeling_outputs import CausalLMOutputWithCrossAttentions
+
+
+class T3HuggingfaceBackend(LlamaPreTrainedModel, GenerationMixin):
+    """
+    Override some HuggingFace interface methods so we can use the standard `generate` method with our
+    custom embedding / logit layers.
+
+    NOTE: need to extend "*PreTrainedModel" to avoid re-initializing weights!
+    """
+
+    def __init__(
+        self,
+        config: LlamaConfig,
+        llama: LlamaModel,
+        *,
+        speech_enc,
+        speech_head,
+        latents_queue=None,
+        logits_queue=None,
+        alignment_stream_analyzer: 'AlignmentStreamAnalyzer'=None,
+    ):
+        super().__init__(config)
+        self.model = llama
+        self.speech_enc = speech_enc
+        self.speech_head = speech_head
+        self._added_cond = False
+        self.alignment_stream_analyzer = alignment_stream_analyzer
+
+    @torch.inference_mode()
+    def prepare_inputs_for_generation(
+        self, input_ids: torch.Tensor, decoder_cond: torch.Tensor, use_cache: bool, past_key_values=None,
+        # This argument was introduced in some recent version of transformers (>=4.29.1)
+        cache_position=None
+    ):
+        """
+        This is a method used by huggingface's generate() method.
+        Overridden here to apply our custom speech token embedding layer.
+
+        :param input_ids: (B, S) int64 tensors of input tokens.
+        :param decoder_cond: (B, T, C) float32 tensor of conditioning (prefixed to <input_embeds>)
+        """
+
+        # Make use of the kv cache: only the last input ID is new, we trim away all the ones before
+        if not use_cache:
+            past_key_values = None
+        if past_key_values is not None:
+            input_ids = input_ids[:, -1:]
+
+        # custom speech token embedding layer
+        inputs_embeds = self.speech_enc(input_ids)
+
+        # prefix decoder conditioning if applicable
+        if not self._added_cond:
+            assert past_key_values is not None # should be first step
+            if decoder_cond.size(0) != inputs_embeds.size(0):
+                decoder_cond = decoder_cond.expand(inputs_embeds.size(0), -1, -1)
+            inputs_embeds = torch.cat([decoder_cond, inputs_embeds], dim=1)
+            self._added_cond = True
+
+        return {
+            "inputs_embeds": inputs_embeds,
+            "past_key_values": past_key_values,
+            "use_cache": use_cache,
+        }
+
+    @torch.inference_mode()
+    def forward(
+        self,
+        inputs_embeds: torch.Tensor,
+        past_key_values: Optional[torch.Tensor]=None,
+        use_cache=True,
+        output_attentions=False,
+        output_hidden_states=True,
+        return_dict=True,
+    ):
+        """
+        This is a method used by huggingface's generate() method.
+        Overridden here to apply our custom layer norm and speech logit projection layers.
+
+        :param inputs_embeds: (B, S, C) float32 tensor of conditioning inputs. If past key values are given,
+        S should be 1.
+        """
+        is_large_input = inputs_embeds.size(1) != 1
+        has_cache = past_key_values is not None and len(past_key_values) > 0
+        assert not (is_large_input and has_cache)
+        assert return_dict
+        assert output_hidden_states
+
+        tfmr_out = self.model(
+            inputs_embeds=inputs_embeds,
+            past_key_values=past_key_values,
+            use_cache=use_cache,
+            output_attentions=output_attentions,
+            output_hidden_states=output_hidden_states,
+            return_dict=True,
+        )
+        hidden_states = tfmr_out.hidden_states[-1]  # (B, seq, dim)
+
+        logits = self.speech_head(hidden_states)
+        # assert inputs_embeds.size(0) == 1 # (disabled for CFG)
+
+        # NOTE: hallucination handler may modify logits to force emit an EOS token
+        # logits = self.alignment_stream_analyzer.step(logits)
+
+        return CausalLMOutputWithCrossAttentions(
+            logits=logits,
+            past_key_values=tfmr_out.past_key_values,
+            hidden_states=tfmr_out.hidden_states,
+            attentions=tfmr_out.attentions,
+        )

src/chatterbox/models/t3/llama_configs.py

@@ -0,0 +1,33 @@
+# FILE: src/chatterbox/models/t3/llama_configs.py
+LLAMA_520M_CONFIG_DICT = dict(
+    # Arbitrary small number that won't cause problems when loading.
+    # These param are unused due to custom input layers.
+    vocab_size=8,
+    # This defines the maximum sequence length the RoPE mechanism is initially configured for
+    # if rope_scaling is None. 8192 is a common value for Llama models.
+    max_position_embeddings=8192,
+    hidden_size=1024,
+    intermediate_size=4096,
+    num_hidden_layers=30,
+    num_attention_heads=16,
+    attn_implementation="sdpa", # Use "eager" if "sdpa" causes issues with older torch/transformers
+    head_dim=64, # hidden_size // num_attention_heads
+    tie_word_embeddings=False,
+    hidden_act="silu",
+    attention_bias=False,
+    attention_dropout=0.0,
+    initializer_range=0.02,
+    mlp_bias=False,
+    model_type="llama",
+    num_key_value_heads=16, # For Llama GQA/MQA. For standard MHA, num_key_value_heads = num_attention_heads
+    pretraining_tp=1,
+    rms_norm_eps=1e-05,
+    rope_scaling=None, # MODIFICATION: Explicitly set to None
+    rope_theta=500000.0, # This is crucial for Llama 3 style RoPE
+    torch_dtype="bfloat16", # Consider "float16" or "float32" if bf16 is not supported or causes issues
+    use_cache=True,
+)
+
+LLAMA_CONFIGS = {
+    "Llama_520M": LLAMA_520M_CONFIG_DICT,
+}

src/chatterbox/models/t3/modules/cond_enc.py

@@ -0,0 +1,97 @@
+from dataclasses import dataclass
+from typing import Optional
+
+import torch
+from torch import nn, Tensor
+
+from .perceiver import Perceiver
+from .t3_config import T3Config
+
+
+@dataclass
+class T3Cond:
+    """
+    Dataclass container for most / all conditioning info.
+    TODO: serialization methods aren't used, keeping them around for convenience
+    """
+
+    speaker_emb: Tensor
+    clap_emb: Optional[Tensor] = None
+    cond_prompt_speech_tokens: Optional[Tensor] = None
+    cond_prompt_speech_emb: Optional[Tensor] = None
+    emotion_adv: Optional[Tensor] = 0.5
+
+    def to(self, *, device=None, dtype=None):
+        "Cast to a device and dtype. Dtype casting is ignored for long/int tensors."
+        for k, v in self.__dict__.items():
+            if torch.is_tensor(v):
+                is_fp = type(v.view(-1)[0].item()) is not int
+                setattr(self, k, v.to(device=device, dtype=dtype if is_fp else None))
+        return self
+
+    def save(self, fpath):
+        torch.save(self.__dict__, fpath)
+
+    @staticmethod
+    def load(fpath, map_location="cpu"):
+        kwargs = torch.load(fpath, map_location=map_location, weights_only=True)
+        return T3Cond(**kwargs)
+
+
+class T3CondEnc(nn.Module):
+    """
+    Handle all non-text conditioning, like speaker embeddings / prompts, CLAP, emotion, etc.
+    """
+
+    def __init__(self, hp: T3Config):
+        super().__init__()
+        self.hp = hp
+        if hp.encoder_type == "voice_encoder":
+            self.spkr_enc = nn.Linear(hp.speaker_embed_size, hp.n_channels)
+        else:
+            raise NotImplementedError(str(hp.encoder_type))
+
+        # emotion adv
+        self.emotion_adv_fc = None
+        if hp.emotion_adv:
+            self.emotion_adv_fc = nn.Linear(1, hp.n_channels, bias=False)
+
+        # perceiver resampler
+        self.perceiver = None
+        if hp.use_perceiver_resampler:
+            self.perceiver = Perceiver()
+
+    def forward(self, cond: T3Cond):
+        # Validate
+        assert (cond.cond_prompt_speech_tokens is None) == (cond.cond_prompt_speech_emb is None), \
+            "no embeddings for cond_prompt_speech_tokens"
+
+        # Speaker embedding projection
+        cond_spkr = self.spkr_enc(cond.speaker_emb.view(-1, self.hp.speaker_embed_size))[:, None]  # (B, 1, dim)
+        empty = torch.zeros_like(cond_spkr[:, :0])  # (B, 0, dim)
+
+        # TODO CLAP
+        assert cond.clap_emb is None, "clap_embed not implemented"
+        cond_clap = empty  # (B, 0, dim)
+
+        # Cond prompt
+        cond_prompt_speech_emb = cond.cond_prompt_speech_emb
+        if cond_prompt_speech_emb is None:
+            cond_prompt_speech_emb = empty  # (B, 0, dim)
+        elif self.hp.use_perceiver_resampler:
+            cond_prompt_speech_emb = self.perceiver(cond_prompt_speech_emb)
+
+        # Emotion Adv: must provide a value if this model uses emotion conditioning
+        cond_emotion_adv = empty  # (B, 0, dim)
+        if self.hp.emotion_adv:
+            assert cond.emotion_adv is not None
+            cond_emotion_adv = self.emotion_adv_fc(cond.emotion_adv.view(-1, 1, 1))
+
+        # Concat and return
+        cond_embeds = torch.cat((
+            cond_spkr,
+            cond_clap,
+            cond_prompt_speech_emb,
+            cond_emotion_adv,
+        ), dim=1)
+        return cond_embeds

src/chatterbox/models/t3/modules/learned_pos_emb.py

@@ -0,0 +1,32 @@
+from typing import Union
+
+import torch
+from torch import nn, Tensor
+
+
+class LearnedPositionEmbeddings(nn.Module):
+    def __init__(self, seq_len, model_dim, init=.02):
+        super().__init__()
+        self.emb = nn.Embedding(seq_len, model_dim)
+        # Initializing this way is standard for GPT-2
+        self.emb.weight.data.normal_(mean=0.0, std=init)
+
+    def forward(self, x):
+        """
+        Returns positional embeddings for index 0 up to the length of x
+        """
+        sl = x.shape[1]
+        return self.emb(torch.arange(0, sl, device=x.device))
+
+    def get_fixed_embedding(self, idx: 'Union[int, Tensor]'):
+        """
+        Args:
+            idx: scalar int or an integer tensor of shape (T,) or (B, T)
+        Returns:
+            positional embeddings for given indices, shape (B, T, dim), ie (1, 1, dim) for int input
+        """
+        device = self.emb.weight.device
+        idx = idx.to(device) if torch.is_tensor(idx) else torch.tensor(idx, device=device)
+        idx = torch.atleast_2d(idx)
+        assert idx.ndim == 2
+        return self.emb(idx)  # (B, T, dim)

src/chatterbox/models/t3/modules/perceiver.py

@@ -0,0 +1,212 @@
+# Copyright (c) 2025 Resemble AI
+# Author: Manmay Nakhashi
+# MIT License
+import math
+
+import torch
+from torch import nn
+import torch.nn.functional as F
+from einops import rearrange
+from torch.nn.attention import SDPBackend, sdpa_kernel
+
+class RelativePositionBias(nn.Module):
+    def __init__(self, scale, causal=False, num_buckets=32, max_distance=128, heads=8):
+        super().__init__()
+        self.scale = scale
+        self.causal = causal
+        self.num_buckets = num_buckets
+        self.max_distance = max_distance
+        self.relative_attention_bias = nn.Embedding(num_buckets, heads)
+
+    @staticmethod
+    def _relative_position_bucket(relative_position, causal=True, num_buckets=32, max_distance=128):
+        ret = 0
+        n = -relative_position
+        if not causal:
+            num_buckets //= 2
+            ret += (n < 0).long() * num_buckets
+            n = torch.abs(n)
+        else:
+            n = torch.max(n, torch.zeros_like(n))
+
+        max_exact = num_buckets // 2
+        is_small = n < max_exact
+
+        val_if_large = max_exact + (
+                torch.log(n.float() / max_exact) / math.log(max_distance / max_exact) * (num_buckets - max_exact)
+        ).long()
+        val_if_large = torch.min(val_if_large, torch.full_like(val_if_large, num_buckets - 1))
+
+        ret += torch.where(is_small, n, val_if_large)
+        return ret
+
+    def forward(self, qk_dots):
+        i, j, device = *qk_dots.shape[-2:], qk_dots.device
+        q_pos = torch.arange(i, dtype=torch.long, device=device)
+        k_pos = torch.arange(j, dtype=torch.long, device=device)
+        rel_pos = k_pos[None, :] - q_pos[:, None]
+        rp_bucket = self._relative_position_bucket(rel_pos, causal=self.causal, num_buckets=self.num_buckets,
+                                                   max_distance=self.max_distance)
+        values = self.relative_attention_bias(rp_bucket)
+        bias = rearrange(values, 'i j h -> () h i j')
+        return qk_dots + (bias * self.scale)
+
+
+class AttentionQKV(nn.Module):
+    def __init__(self, n_heads, head_dim, dropout_rate=0.1, scale=None, flash=False):
+        super().__init__()
+        self.n_heads = n_heads
+        self.head_dim = head_dim
+        self.scale = scale if scale is not None else head_dim ** -0.5
+        self.flash = flash
+        self.dropout_rate = dropout_rate
+        self.dropout = nn.Dropout(dropout_rate)
+        self.flash_config = self.setup_flash_config() if flash else None
+
+    def setup_flash_config(self):
+        # Setup flash attention configuration
+        flash_config = {
+            'enable_math': True,
+            'enable_mem_efficient': True
+        }
+        return flash_config
+
+    def forward(self, q, k, v, mask=None):
+        q, k, v = [self.split_heads(tensor) for tensor in [q, k, v]]
+        if self.flash:
+            out = self.flash_attention(q, k, v, mask=mask)
+        else:
+            out = self.scaled_dot_product_attention(q, k, v, mask=mask)
+
+        return self.combine_heads(out)
+
+    def scaled_dot_product_attention(self, q, k, v, mask=None):
+        sim = torch.einsum("bhlt,bhls->bhts", q, k) * self.scale
+        if mask is not None:
+            sim = sim.masked_fill(mask == 0, float('-inf'))
+        attn = torch.softmax(sim, dim=-1)
+        attn = self.dropout(attn)
+        return torch.einsum("bhts,bhls->bhlt", attn, v)
+
+    def flash_attention(self, q, k, v, mask=None):
+        config = self.flash_config if self.flash_config else {}
+        with sdpa_kernel(backends=[SDPBackend.EFFICIENT_ATTENTION]):
+            out = F.scaled_dot_product_attention(
+                q, k, v,
+                attn_mask=mask,
+                dropout_p=self.dropout_rate if self.training else 0.
+            )
+
+        return out
+
+    def split_heads(self, x):
+        bs, length, _ = x.shape
+        x = x.view(bs, length, self.n_heads, self.head_dim)
+        return x.permute(0, 2, 1, 3)
+
+    def combine_heads(self, x):
+        bs, _, length, _ = x.shape
+        x = x.permute(0, 2, 1, 3).contiguous()
+        return x.view(bs, length, -1)
+
+
+class AttentionBlock2(nn.Module):
+    """
+    An attention block that allows spatial positions to attend to each other,
+    using AttentionQKV and separate linear transformations for Q, K, and V.
+    """
+
+    def __init__(
+        self,
+        channels,
+        num_heads=1,
+        num_head_channels=-1,
+        relative_pos_embeddings=False,
+        flash_attention=True,
+        dropout_rate=0.2,
+        scale=None
+    ):
+        super().__init__()
+        self.channels = channels
+
+        if num_head_channels == -1:
+            self.num_heads = num_heads
+        else:
+            assert (
+                channels % num_head_channels == 0
+            ), f"channels {channels} is not divisible by num_head_channels {num_head_channels}"
+            self.num_heads = channels // num_head_channels
+
+        self.norm = nn.LayerNorm(channels)
+
+        # Separate linear layers for Q, K, and V
+        self.to_q = nn.Linear(channels, channels)
+        self.to_k = nn.Linear(channels, channels)
+        self.to_v = nn.Linear(channels, channels)
+
+        self.attention = AttentionQKV(self.num_heads, channels // self.num_heads, dropout_rate=dropout_rate, flash=flash_attention, scale=scale)
+
+        self.proj_out = nn.Linear(channels, channels)
+
+        if relative_pos_embeddings:
+            self.relative_pos_embeddings = RelativePositionBias(scale=(channels // self.num_heads) ** .5, causal=False, heads=num_heads, num_buckets=32, max_distance=64)
+        else:
+            self.relative_pos_embeddings = None
+
+    def forward(self, x1, x2, mask=None):
+        b1, c1, *spatial1 = x1.shape
+        b2, c2, *spatial2 = x2.shape
+
+        x1_norm = self.norm(x1)
+        x2_norm = self.norm(x2)
+
+        q = self.to_q(x1_norm)
+        k = self.to_k(x2_norm)
+        v = self.to_v(x2_norm)
+
+        h = self.attention(q, k, v, mask=mask)
+        h = self.proj_out(h)
+
+        return (x1 + h).reshape(b1, c1, *spatial1)
+
+
+class Perceiver(nn.Module):
+    """Inspired by https://arxiv.org/abs/2103.03206"""
+    def __init__(self, pre_attention_query_token=32, pre_attention_query_size=1024, embedding_dim=1024, num_attn_heads=4):
+        """
+        Initialize the perceiver module.
+
+        :param pre_attention_query_token: Number of query tokens for pre-attention
+        :param pre_attention_query_size: Size of each query token
+        :param embedding_dim: Dimension of the embedding space
+        :param num_attn_heads: Number of attention heads
+        """
+        super().__init__()
+
+        # Initialize the pre-attention query parameter
+        self.pre_attention_query = torch.nn.Parameter(
+            torch.empty(1, pre_attention_query_token, pre_attention_query_size)
+        )
+
+        # Calculate the variance for uniform initialization
+        query_variance = math.sqrt(3.0) * math.sqrt(2.0 / (pre_attention_query_token + pre_attention_query_token))
+
+        # Initialize the pre-attention query with uniform distribution
+        self.pre_attention_query.data.uniform_(-query_variance, query_variance)
+
+        # Initialize the attention block
+        self.attn = AttentionBlock2(embedding_dim, num_attn_heads)
+
+    def forward(self, h):
+        """
+        Forward pass of the perceiver module.
+        :param h: Input tensor
+        :return: Output after applying attention mechanisms
+        """
+        # Expand the pre-attention query to match the batch size of the input
+        query_ = self.pre_attention_query.expand(h.shape[0], -1, -1)
+        # Apply the first attention mechanism (cross-attention)
+        pre_att = self.attn(query_, h)
+        # Apply the second attention mechanism (self-attention)
+        attn = self.attn(pre_att, pre_att)
+        return attn

src/chatterbox/models/t3/modules/t3_config.py

@@ -0,0 +1,27 @@
+from ..llama_configs import LLAMA_CONFIGS
+
+
+class T3Config:
+    start_text_token = 255
+    stop_text_token = 0
+    text_tokens_dict_size = 704
+    max_text_tokens = 2048
+
+    start_speech_token = 6561
+    stop_speech_token = 6562
+    speech_tokens_dict_size = 8194
+    max_speech_tokens = 4096
+
+    llama_config_name = "Llama_520M"
+    input_pos_emb = "learned"
+    speech_cond_prompt_len = 150
+
+    # For T3CondEnc
+    encoder_type = "voice_encoder"
+    speaker_embed_size = 256
+    use_perceiver_resampler = True
+    emotion_adv = True
+
+    @property
+    def n_channels(self):
+        return LLAMA_CONFIGS[self.llama_config_name]["hidden_size"]

src/chatterbox/models/t3/t3.py

@@ -0,0 +1,372 @@
+# Copyright (c) 2025 Resemble AI
+# MIT License
+import logging
+from typing import Union, Optional, List
+
+from tqdm import tqdm
+import torch
+import torch.nn.functional as F
+from torch import nn, Tensor
+from transformers import LlamaModel, LlamaConfig
+from transformers.generation.logits_process import TopPLogitsWarper, RepetitionPenaltyLogitsProcessor
+
+from .modules.learned_pos_emb import LearnedPositionEmbeddings
+
+from .modules.cond_enc import T3CondEnc, T3Cond
+from .modules.t3_config import T3Config
+from .llama_configs import LLAMA_CONFIGS
+from .inference.t3_hf_backend import T3HuggingfaceBackend
+from .inference.alignment_stream_analyzer import AlignmentStreamAnalyzer
+
+
+logger = logging.getLogger(__name__)
+
+
+class AttrDict(dict):
+    def __init__(self, *args, **kwargs):
+        super(AttrDict, self).__init__(*args, **kwargs)
+        self.__dict__ = self
+
+
+def _ensure_BOT_EOT(text_tokens: Tensor, hp):
+    B = text_tokens.size(0)
+    assert (text_tokens == hp.start_text_token).int().sum() >= B, "missing start_text_token"
+    assert (text_tokens == hp.stop_text_token).int().sum() >= B, "missing stop_text_token"
+
+
+class T3(nn.Module):
+    """
+    Token-To-Token (T3) TTS model using huggingface transformer models as backbones,
+        * tokenization, including start / stop tokens are always added externally to this class
+        * conditioning data like CLAP, emotion, etc are all in a separate file for more modularity
+        * careful! this class assumes relative positional encoding -- with absolute PE, we would at
+            least want to reset the position to 0 when speech tokens begin, and optionally use a
+            different PE embedding space for speech.
+    """
+
+    def __init__(self, hp=T3Config()):
+        super().__init__()
+        self.hp = hp
+        self.cfg = LlamaConfig(**LLAMA_CONFIGS[hp.llama_config_name])
+        self.tfmr = LlamaModel(self.cfg)
+        self.dim = self.cfg.hidden_size
+        self.deepspeed_patch_applied = False
+
+        # conditioning / embedding
+        self.cond_enc = T3CondEnc(hp)
+        self.text_emb = nn.Embedding(hp.text_tokens_dict_size, self.dim)
+        self.speech_emb = nn.Embedding(hp.speech_tokens_dict_size, self.dim)
+
+        # custom position embedding
+        if hp.input_pos_emb == "learned":
+            max_text_seq_len = hp.max_text_tokens + 2
+            self.text_pos_emb = LearnedPositionEmbeddings(max_text_seq_len, self.dim)
+
+            max_mel_seq_len = hp.max_speech_tokens + 2 + 2
+            self.speech_pos_emb = LearnedPositionEmbeddings(max_mel_seq_len, self.dim)
+
+        # logit projection
+        self.text_head = nn.Linear(self.cfg.hidden_size, hp.text_tokens_dict_size, bias=False)
+        self.speech_head = nn.Linear(self.cfg.hidden_size, hp.speech_tokens_dict_size, bias=False)
+        self.compiled = False
+
+    @property
+    def device(self):
+        return self.speech_head.weight.device
+
+    def prepare_conditioning(self, t3_cond: T3Cond):
+        """
+        Token cond data needs to be embedded, so that needs to be here instead of in `T3CondEnc`.
+        """
+        if t3_cond.cond_prompt_speech_tokens is not None and t3_cond.cond_prompt_speech_emb is None:
+            t3_cond.cond_prompt_speech_emb = self.speech_emb(t3_cond.cond_prompt_speech_tokens) + \
+                self.speech_pos_emb(t3_cond.cond_prompt_speech_tokens)
+        return self.cond_enc(t3_cond)  # (B, len_cond, dim)
+
+    def prepare_input_embeds(
+        self,
+        *,
+        t3_cond: T3Cond,
+        text_tokens: torch.LongTensor,
+        speech_tokens: torch.LongTensor,
+    ):
+        # prepare input embeddings (skip backbone tranformer embeddings)
+        cond_emb = self.prepare_conditioning(t3_cond)  # (B, len_cond, dim)
+        text_emb = self.text_emb(text_tokens)  # (B, len_text, dim)
+        text_emb[1].zero_()  # CFG uncond
+
+        speech_emb = self.speech_emb(speech_tokens)  # (B, len_speech, dim)
+        if self.hp.input_pos_emb == "learned":
+            text_emb = text_emb + self.text_pos_emb(text_tokens)
+            speech_emb = speech_emb + self.speech_pos_emb(speech_tokens)
+        len_cond = cond_emb.size(1)
+
+        if cond_emb.size(0) != text_emb.size(0):
+             cond_emb = cond_emb.expand(text_emb.size(0), -1, -1)
+
+        # concat
+        embeds = torch.stack([
+            torch.cat((ce, te, se))
+            for ce, te, se in zip(cond_emb, text_emb, speech_emb)
+        ])  # (B, length, dim)
+        return embeds, len_cond
+
+    def forward(
+        self,
+        *,
+        t3_cond: T3Cond,
+        text_tokens: torch.LongTensor,
+        text_token_lens: torch.LongTensor,
+        speech_tokens: torch.LongTensor,
+        speech_token_lens: torch.LongTensor,
+        training=False,
+    ):
+        _ensure_BOT_EOT(text_tokens, self.hp)
+
+        # prepare custom input embeds
+        embeds, len_cond = self.prepare_input_embeds(
+            t3_cond=t3_cond,
+            text_tokens=text_tokens,
+            speech_tokens=speech_tokens,
+        )
+
+        # backbone tranformer forward
+        tfmr_out = self.tfmr.forward(
+            input_ids=None,
+            # position_ids=position_ids, # TODO? ROPE should be fine?
+            inputs_embeds=embeds,
+            output_hidden_states=True,
+            return_dict=True,
+            use_cache=(not training),
+        )
+        hidden_states = tfmr_out.hidden_states[-1]  # final tfmr layer output, (B, seq, dim)
+
+        # post-processing: splice out text and speech parts of hidden states
+        len_text = text_tokens.size(1)
+        len_speech = speech_tokens.size(1)
+        B, _, dim = hidden_states.shape
+        device, dtype = hidden_states.device, hidden_states.dtype
+        text_latents = torch.zeros(B, len_text, dim, dtype=dtype, device=device)
+        speech_latents = torch.zeros(B, len_speech, dim, dtype=dtype, device=device)
+        ttl, stl = text_token_lens, speech_token_lens
+        for i in range(B):
+            text_end = len_cond + ttl[i].item()
+            speech_start = len_cond + text_tokens.size(1)
+            speech_end = speech_start + stl[i].item()
+            text_latents[i, :ttl[i]] = hidden_states[i, len_cond:text_end]
+            speech_latents[i, :stl[i]] = hidden_states[i, speech_start:speech_end]
+
+        # logit projection
+        text_logits = self.text_head(text_latents)
+        speech_logits = self.speech_head(speech_latents)
+
+        return AttrDict(
+            text_logits=text_logits,
+            text_latents=text_latents,
+            speech_logits=speech_logits,
+            speech_latents=speech_latents,
+            hidden_states=hidden_states,
+        )
+
+    def loss(
+        self,
+        *,
+        t3_cond: T3Cond,
+        text_tokens: torch.LongTensor,
+        text_token_lens: torch.LongTensor,
+        speech_tokens: torch.LongTensor,
+        speech_token_lens: torch.LongTensor,
+    ):
+        "training method"
+        len_text = text_tokens.size(1)
+        len_speech = speech_tokens.size(1)
+        assert len_text == text_token_lens.max()
+        assert len_speech == speech_token_lens.max()
+
+        out = self.forward(
+            t3_cond=t3_cond,
+            text_tokens=text_tokens,
+            text_token_lens=text_token_lens,
+            speech_tokens=speech_tokens,
+            speech_token_lens=speech_token_lens,
+            training=True,
+        )  # (B, seq, vocab_size)
+
+        # Calc CCE losses
+        IGNORE_ID = -100
+        device = out.text_logits.device
+        mask_text = torch.arange(len_text, device=device)[None] >= text_token_lens[:, None]  # (B, len_text)
+        mask_speech = torch.arange(len_speech, device=device)[None] >= speech_token_lens[:, None]  # (B, len_speech)
+        masked_text = text_tokens.masked_fill(mask_text, IGNORE_ID)
+        masked_speech = speech_tokens.masked_fill(mask_speech, IGNORE_ID)
+        loss_text = F.cross_entropy(out.text_logits, masked_text, ignore_index=IGNORE_ID)
+        loss_speech = F.cross_entropy(out.speech_logits, masked_speech, ignore_index=IGNORE_ID)
+
+        return loss_text, loss_speech
+
+    @torch.inference_mode()
+    def inference(
+        self,
+        *,
+        t3_cond: T3Cond,
+        text_tokens: Tensor,
+        initial_speech_tokens: Optional[Tensor]=None,
+
+        # misc conditioning
+        prepend_prompt_speech_tokens: Optional[Tensor]=None,
+
+        # HF generate args
+        num_return_sequences=1,
+        max_new_tokens=None,
+        stop_on_eos=True,
+        do_sample=True,
+        temperature=0.8,
+        top_p=0.8,
+        length_penalty=1.0,
+        repetition_penalty=2.0,
+        cfg_weight=0,
+    ):
+        """
+        Args:
+            text_tokens: a 1D (unbatched) or 2D (batched) tensor.
+        """
+        # Validate / sanitize inputs
+        assert prepend_prompt_speech_tokens is None, "not implemented"
+        _ensure_BOT_EOT(text_tokens, self.hp)
+        text_tokens = torch.atleast_2d(text_tokens).to(dtype=torch.long, device=self.device)
+
+        # Default initial speech to a single start-of-speech token
+        if initial_speech_tokens is None:
+            initial_speech_tokens = self.hp.start_speech_token * torch.ones_like(text_tokens[:, :1])
+
+        # Prepare custom input embeds
+        embeds, len_cond = self.prepare_input_embeds(
+            t3_cond=t3_cond,
+            text_tokens=text_tokens,
+            speech_tokens=initial_speech_tokens,
+        )
+
+        # In order to use the standard HF generate method, we need to extend some methods to inject our custom logic
+        # Note the llama-specific logic. Other tfmr types can be added later.
+
+        self.compiled = False
+
+        # TODO? synchronize the expensive compile function
+        # with self.compile_lock:
+        if not self.compiled:
+            alignment_stream_analyzer = AlignmentStreamAnalyzer(
+                self.tfmr,
+                None,
+                text_tokens_slice=(len_cond, len_cond + text_tokens.size(-1)),
+                alignment_layer_idx=9, # TODO: hparam or something?
+                eos_idx=self.hp.stop_speech_token,
+            )
+            patched_model = T3HuggingfaceBackend(
+                config=self.cfg,
+                llama=self.tfmr,
+                speech_enc=self.speech_emb,
+                speech_head=self.speech_head,
+                alignment_stream_analyzer=alignment_stream_analyzer,
+            )
+            self.patched_model = patched_model
+            self.compiled = True
+
+        # # Run normal generate method, which calls our custom extended methods
+        # return self.patched_model.generate(
+        #     inputs=initial_speech_tokens,
+        #     decoder_cond=embeds,
+        #     bos_token_id=self.hp.start_speech_token,
+        #     eos_token_id=(self.hp.stop_speech_token if stop_on_eos else -1),
+        #     pad_token_id=self.hp.stop_speech_token,
+        #     max_new_tokens=max_new_tokens or self.hp.max_speech_tokens,
+        #     num_return_sequences=num_return_sequences,
+        #     temperature=temperature,
+        #     top_p=top_p,
+        #     length_penalty=length_penalty,
+        #     repetition_penalty=repetition_penalty,
+        #     do_sample=do_sample,
+        #     # cache_implementation=None if not self.compiled else "static",
+        # )
+
+        device = embeds.device
+
+        bos_token = torch.tensor([[self.hp.start_speech_token]], dtype=torch.long, device=device)
+        bos_embed = self.speech_emb(bos_token)  # shape: (B, 1, embed_dim)
+        bos_embed = bos_embed + self.speech_pos_emb.get_fixed_embedding(0)
+
+        # batch_size=2 for CFG
+        bos_embed = torch.cat([bos_embed, bos_embed])
+
+        # Combine condition and BOS token for the initial input
+        inputs_embeds = torch.cat([embeds, bos_embed], dim=1)
+
+        # Track generated token ids; start with the BOS token.
+        generated_ids = bos_token.clone()
+        predicted = []  # To store the predicted tokens
+
+        # Instantiate the logits processors.
+        top_p_warper = TopPLogitsWarper(top_p=top_p)
+        repetition_penalty_processor = RepetitionPenaltyLogitsProcessor(penalty=repetition_penalty)
+
+        # ---- Initial Forward Pass (no kv_cache yet) ----
+        output = self.patched_model(
+            inputs_embeds=inputs_embeds,
+            past_key_values=None,
+            use_cache=True,
+            output_attentions=True,
+            output_hidden_states=True,
+            return_dict=True,
+        )
+        # Initialize kv_cache with the full context.
+        past = output.past_key_values
+
+        # ---- Generation Loop using kv_cache ----
+        for i in tqdm(range(max_new_tokens), desc="Sampling", dynamic_ncols=True):
+            logits = output.logits[:, -1, :]
+
+            # CFG
+            logits_cond = logits[0:1]
+            logits_uncond = logits[1:2]
+            logits = logits_cond + cfg_weight * (logits_cond - logits_uncond)
+            logits = logits.squeeze(1)
+
+            # Apply temperature scaling.
+            if temperature != 1.0:
+                logits = logits / temperature
+
+            # Apply repetition penalty and top‑p filtering.
+            logits = repetition_penalty_processor(generated_ids, logits)
+            logits = top_p_warper(None, logits)
+
+            # Convert logits to probabilities and sample the next token.
+            probs = torch.softmax(logits, dim=-1)
+            next_token = torch.multinomial(probs, num_samples=1)  # shape: (B, 1)
+
+            predicted.append(next_token)
+            generated_ids = torch.cat([generated_ids, next_token], dim=1)
+
+            # Check for EOS token.
+            if next_token.view(-1) == self.hp.stop_speech_token:
+                break
+
+            # Get embedding for the new token.
+            next_token_embed = self.speech_emb(next_token)
+            next_token_embed = next_token_embed + self.speech_pos_emb.get_fixed_embedding(i + 1)
+
+            #  For CFG
+            next_token_embed = torch.cat([next_token_embed, next_token_embed])
+
+            # Forward pass with only the new token and the cached past.
+            output = self.patched_model(
+                inputs_embeds=next_token_embed,
+                past_key_values=past,
+                output_attentions=True,
+                output_hidden_states=True,
+                return_dict=True,
+            )
+            # Update the kv_cache.
+            past = output.past_key_values
+
+        # Concatenate all predicted tokens along the sequence dimension.
+        predicted_tokens = torch.cat(predicted, dim=1)  # shape: (B, num_tokens)
+        return predicted_tokens

src/chatterbox/models/tokenizers/__init__.py

@@ -0,0 +1 @@
+from .tokenizer import EnTokenizer

src/chatterbox/models/tokenizers/tokenizer.py

@@ -0,0 +1,50 @@
+import logging
+
+import torch
+from tokenizers import Tokenizer
+
+
+# Special tokens
+SOT = "[START]"
+EOT = "[STOP]"
+UNK = "[UNK]"
+SPACE = "[SPACE]"
+SPECIAL_TOKENS = [SOT, EOT, UNK, SPACE, "[PAD]", "[SEP]", "[CLS]", "[MASK]"]
+
+logger = logging.getLogger(__name__)
+
+class EnTokenizer:
+    def __init__(self, vocab_file_path):
+        self.tokenizer: Tokenizer = Tokenizer.from_file(vocab_file_path)
+        self.check_vocabset_sot_eot()
+
+    def check_vocabset_sot_eot(self):
+        voc = self.tokenizer.get_vocab()
+        assert SOT in voc
+        assert EOT in voc
+
+    def text_to_tokens(self, text: str):
+        text_tokens = self.encode(text)
+        text_tokens = torch.IntTensor(text_tokens).unsqueeze(0)
+        return text_tokens
+
+    def encode( self, txt: str, verbose=False):
+        """
+        clean_text > (append `lang_id`) > replace SPACE > encode text using Tokenizer
+        """
+        txt = txt.replace(' ', SPACE)
+        code = self.tokenizer.encode(txt)
+        ids = code.ids
+        return ids
+
+    def decode(self, seq):
+        if isinstance(seq, torch.Tensor):
+            seq = seq.cpu().numpy()
+
+        txt: str = self.tokenizer.decode(seq,
+        skip_special_tokens=False)
+        txt = txt.replace(' ', '')
+        txt = txt.replace(SPACE, ' ')
+        txt = txt.replace(EOT, '')
+        txt = txt.replace(UNK, '')
+        return txt

src/chatterbox/models/voice_encoder/__init__.py

@@ -0,0 +1 @@
+from .voice_encoder import VoiceEncoder, VoiceEncConfig

src/chatterbox/models/voice_encoder/config.py

@@ -0,0 +1,18 @@
+class VoiceEncConfig:
+    num_mels = 40
+    sample_rate = 16000
+    speaker_embed_size = 256
+    ve_hidden_size = 256
+    flatten_lstm_params = False
+    n_fft = 400
+    hop_size = 160
+    win_size = 400
+    fmax = 8000
+    fmin = 0
+    preemphasis = 0.
+    mel_power = 2.0
+    mel_type = "amp"
+    normalized_mels = False
+    ve_partial_frames = 160
+    ve_final_relu = True
+    stft_magnitude_min = 1e-4

src/chatterbox/models/voice_encoder/melspec.py

@@ -0,0 +1,78 @@
+from functools import lru_cache
+
+from scipy import signal
+import numpy as np
+import librosa
+
+
+@lru_cache()
+def mel_basis(hp):
+    assert hp.fmax <= hp.sample_rate // 2
+    return librosa.filters.mel(
+        sr=hp.sample_rate,
+        n_fft=hp.n_fft,
+        n_mels=hp.num_mels,
+        fmin=hp.fmin,
+        fmax=hp.fmax)  # -> (nmel, nfreq)
+
+
+def preemphasis(wav, hp):
+    assert hp.preemphasis != 0
+    wav = signal.lfilter([1, -hp.preemphasis], [1], wav)
+    wav = np.clip(wav, -1, 1)
+    return wav
+
+
+def melspectrogram(wav, hp, pad=True):
+    # Run through pre-emphasis
+    if hp.preemphasis > 0:
+        wav = preemphasis(wav, hp)
+        assert np.abs(wav).max() - 1 < 1e-07
+
+    # Do the stft
+    spec_complex = _stft(wav, hp, pad=pad)
+
+    # Get the magnitudes
+    spec_magnitudes = np.abs(spec_complex)
+
+    if hp.mel_power != 1.0:
+        spec_magnitudes **= hp.mel_power
+
+    # Get the mel and convert magnitudes->db
+    mel = np.dot(mel_basis(hp), spec_magnitudes)
+    if hp.mel_type == "db":
+        mel = _amp_to_db(mel, hp)
+
+    # Normalise the mel from db to 0,1
+    if hp.normalized_mels:
+        mel = _normalize(mel, hp).astype(np.float32)
+
+    assert not pad or mel.shape[1] == 1 + len(wav) // hp.hop_size   # Sanity check
+    return mel   # (M, T)
+
+
+def _stft(y, hp, pad=True):
+    # NOTE: after 0.8, pad mode defaults to constant, setting this to reflect for
+    #   historical consistency and streaming-version consistency
+    return librosa.stft(
+        y,
+        n_fft=hp.n_fft,
+        hop_length=hp.hop_size,
+        win_length=hp.win_size,
+        center=pad,
+        pad_mode="reflect",
+    )
+
+
+def _amp_to_db(x, hp):
+    return 20 * np.log10(np.maximum(hp.stft_magnitude_min, x))
+
+
+def _db_to_amp(x):
+    return np.power(10.0, x * 0.05)
+
+
+def _normalize(s, hp, headroom_db=15):
+    min_level_db = 20 * np.log10(hp.stft_magnitude_min)
+    s = (s - min_level_db) / (-min_level_db + headroom_db)
+    return s

src/chatterbox/models/voice_encoder/voice_encoder.py

@@ -0,0 +1,274 @@
+# Adapted from https://github.com/CorentinJ/Real-Time-Voice-Cloning
+# MIT License
+from typing import List, Union, Optional
+
+import numpy as np
+from numpy.lib.stride_tricks import as_strided
+import librosa
+import torch
+import torch.nn.functional as F
+from torch import nn, Tensor
+
+from .config import VoiceEncConfig
+from .melspec import melspectrogram
+
+
+def pack(arrays, seq_len: int=None, pad_value=0):
+    """
+    Given a list of length B of array-like objects of shapes (Ti, ...), packs them in a single tensor of
+    shape (B, T, ...) by padding each individual array on the right.
+
+    :param arrays: a list of array-like objects of matching shapes except for the first axis.
+    :param seq_len: the value of T. It must be the maximum of the lengths Ti of the arrays at
+    minimum. Will default to that value if None.
+    :param pad_value: the value to pad the arrays with.
+    :return: a (B, T, ...) tensor
+    """
+    if seq_len is None:
+        seq_len = max(len(array) for array in arrays)
+    else:
+        assert seq_len >= max(len(array) for array in arrays)
+
+    # Convert lists to np.array
+    if isinstance(arrays[0], list):
+        arrays = [np.array(array) for array in arrays]
+
+    # Convert to tensor and handle device
+    device = None
+    if isinstance(arrays[0], torch.Tensor):
+        tensors = arrays
+        device = tensors[0].device
+    else:
+        tensors = [torch.as_tensor(array) for array in arrays]
+
+    # Fill the packed tensor with the array data
+    packed_shape = (len(tensors), seq_len, *tensors[0].shape[1:])
+    packed_tensor = torch.full(packed_shape, pad_value, dtype=tensors[0].dtype, device=device)
+
+    for i, tensor in enumerate(tensors):
+        packed_tensor[i, :tensor.size(0)] = tensor
+
+    return packed_tensor
+
+
+def get_num_wins(
+    n_frames: int,
+    step: int,
+    min_coverage: float,
+    hp: VoiceEncConfig,
+):
+    assert n_frames > 0
+    win_size = hp.ve_partial_frames
+    n_wins, remainder = divmod(max(n_frames - win_size + step, 0), step)
+    if n_wins == 0 or (remainder + (win_size - step)) / win_size >= min_coverage:
+        n_wins += 1
+    target_n = win_size + step * (n_wins - 1)
+    return n_wins, target_n
+
+
+def get_frame_step(
+    overlap: float,
+    rate: float,
+    hp: VoiceEncConfig,
+):
+    # Compute how many frames separate two partial utterances
+    assert 0 <= overlap < 1
+    if rate is None:
+        frame_step = int(np.round(hp.ve_partial_frames * (1 - overlap)))
+    else:
+        frame_step = int(np.round((hp.sample_rate / rate) / hp.ve_partial_frames))
+    assert 0 < frame_step <= hp.ve_partial_frames
+    return frame_step
+
+
+def stride_as_partials(
+    mel: np.ndarray,
+    hp: VoiceEncConfig,
+    overlap=0.5,
+    rate: float=None,
+    min_coverage=0.8,
+):
+    """
+    Takes unscaled mels in (T, M) format
+    TODO: doc
+    """
+    assert 0 < min_coverage <= 1
+    frame_step = get_frame_step(overlap, rate, hp)
+
+    # Compute how many partials can fit in the mel
+    n_partials, target_len = get_num_wins(len(mel), frame_step, min_coverage, hp)
+
+    # Trim or pad the mel spectrogram to match the number of partials
+    if target_len > len(mel):
+        mel = np.concatenate((mel, np.full((target_len - len(mel), hp.num_mels), 0)))
+    elif target_len < len(mel):
+        mel = mel[:target_len]
+
+    # Ensure the numpy array data is float32 and contiguous in memory
+    mel = mel.astype(np.float32, order="C")
+
+    # Re-arrange the array in memory to be of shape (N, P, M) with partials overlapping eachother,
+    # where N is the number of partials, P is the number of frames of each partial and M the
+    # number of channels of the mel spectrograms.
+    shape = (n_partials, hp.ve_partial_frames, hp.num_mels)
+    strides = (mel.strides[0] * frame_step, mel.strides[0], mel.strides[1])
+    partials = as_strided(mel, shape, strides)
+    return partials
+
+
+class VoiceEncoder(nn.Module):
+    def __init__(self, hp=VoiceEncConfig()):
+        super().__init__()
+
+        self.hp = hp
+
+        # Network definition
+        self.lstm = nn.LSTM(self.hp.num_mels, self.hp.ve_hidden_size, num_layers=3, batch_first=True)
+        if hp.flatten_lstm_params:
+            self.lstm.flatten_parameters()
+        self.proj = nn.Linear(self.hp.ve_hidden_size, self.hp.speaker_embed_size)
+
+        # Cosine similarity scaling (fixed initial parameter values)
+        self.similarity_weight = nn.Parameter(torch.tensor([10.]), requires_grad=True)
+        self.similarity_bias = nn.Parameter(torch.tensor([-5.]), requires_grad=True)
+
+    @property
+    def device(self):
+        return next(self.parameters()).device
+
+    def forward(self, mels: torch.FloatTensor):
+        """
+        Computes the embeddings of a batch of partial utterances.
+
+        :param mels: a batch of unscaled mel spectrograms of same duration as a float32 tensor
+        of shape (B, T, M) where T is hp.ve_partial_frames
+        :return: the embeddings as a float32 tensor of shape (B, E) where E is
+        hp.speaker_embed_size. Embeddings are L2-normed and thus lay in the range [-1, 1].
+        """
+        if self.hp.normalized_mels and (mels.min() < 0 or mels.max() > 1):
+            raise Exception(f"Mels outside [0, 1]. Min={mels.min()}, Max={mels.max()}")
+
+        # Pass the input through the LSTM layers
+        _, (hidden, _) = self.lstm(mels)
+
+        # Project the final hidden state
+        raw_embeds = self.proj(hidden[-1])
+        if self.hp.ve_final_relu:
+            raw_embeds = F.relu(raw_embeds)
+
+        # L2 normalize the embeddings.
+        return raw_embeds / torch.linalg.norm(raw_embeds, dim=1, keepdim=True)
+
+    def inference(self, mels: torch.Tensor, mel_lens, overlap=0.5, rate: float=None, min_coverage=0.8, batch_size=None):
+        """
+        Computes the embeddings of a batch of full utterances with gradients.
+
+        :param mels: (B, T, M) unscaled mels
+        :return: (B, E) embeddings on CPU
+        """
+        mel_lens = mel_lens.tolist() if torch.is_tensor(mel_lens) else mel_lens
+
+        # Compute where to split the utterances into partials
+        frame_step = get_frame_step(overlap, rate, self.hp)
+        n_partials, target_lens = zip(*(get_num_wins(l, frame_step, min_coverage, self.hp) for l in mel_lens))
+
+        # Possibly pad the mels to reach the target lengths
+        len_diff = max(target_lens) - mels.size(1)
+        if len_diff > 0:
+            pad = torch.full((mels.size(0), len_diff, self.hp.num_mels), 0, dtype=torch.float32)
+            mels = torch.cat((mels, pad.to(mels.device)), dim=1)
+
+        # Group all partials together so that we can batch them easily
+        partials = [
+            mel[i * frame_step: i * frame_step + self.hp.ve_partial_frames]
+            for mel, n_partial in zip(mels, n_partials) for i in range(n_partial)
+        ]
+        assert all(partials[0].shape == partial.shape for partial in partials)
+        partials = torch.stack(partials)
+
+        # Forward the partials
+        n_chunks = int(np.ceil(len(partials) / (batch_size or len(partials))))
+        partial_embeds = torch.cat([self(batch) for batch in partials.chunk(n_chunks)], dim=0).cpu()
+
+        # Reduce the partial embeds into full embeds and L2-normalize them
+        slices = np.concatenate(([0], np.cumsum(n_partials)))
+        raw_embeds = [torch.mean(partial_embeds[start:end], dim=0) for start, end in zip(slices[:-1], slices[1:])]
+        raw_embeds = torch.stack(raw_embeds)
+        embeds = raw_embeds / torch.linalg.norm(raw_embeds, dim=1, keepdim=True)
+
+        return embeds
+
+    @staticmethod
+    def utt_to_spk_embed(utt_embeds: np.ndarray):
+        """
+        Takes an array of L2-normalized utterance embeddings, computes the mean embedding and L2-normalize it to get a
+        speaker embedding.
+        """
+        assert utt_embeds.ndim == 2
+        utt_embeds = np.mean(utt_embeds, axis=0)
+        return utt_embeds / np.linalg.norm(utt_embeds, 2)
+
+    @staticmethod
+    def voice_similarity(embeds_x: np.ndarray, embeds_y: np.ndarray):
+        """
+        Cosine similarity for L2-normalized utterance embeddings or speaker embeddings
+        """
+        embeds_x = embeds_x if embeds_x.ndim == 1 else VoiceEncoder.utt_to_spk_embed(embeds_x)
+        embeds_y = embeds_y if embeds_y.ndim == 1 else VoiceEncoder.utt_to_spk_embed(embeds_y)
+        return embeds_x @ embeds_y
+
+    def embeds_from_mels(
+        self, mels: Union[Tensor, List[np.ndarray]], mel_lens=None, as_spk=False, batch_size=32, **kwargs
+    ):
+        """
+        Convenience function for deriving utterance or speaker embeddings from mel spectrograms.
+
+        :param mels: unscaled mels strictly within [0, 1] as either a (B, T, M) tensor or a list of (Ti, M) arrays.
+        :param mel_lens: if passing mels as a tensor, individual mel lengths
+        :param as_spk: whether to return utterance embeddings or a single speaker embedding
+        :param kwargs: args for inference()
+
+        :returns: embeds as a (B, E) float32 numpy array if <as_spk> is False, else as a (E,) array
+        """
+        # Load mels in memory and pack them
+        if isinstance(mels, List):
+            mels = [np.asarray(mel) for mel in mels]
+            assert all(m.shape[1] == mels[0].shape[1] for m in mels), "Mels aren't in (B, T, M) format"
+            mel_lens = [mel.shape[0] for mel in mels]
+            mels = pack(mels)
+
+        # Embed them
+        with torch.inference_mode():
+            utt_embeds = self.inference(mels.to(self.device), mel_lens, batch_size=batch_size, **kwargs).numpy()
+
+        return self.utt_to_spk_embed(utt_embeds) if as_spk else utt_embeds
+
+    def embeds_from_wavs(
+        self,
+        wavs: List[np.ndarray],
+        sample_rate,
+        as_spk=False,
+        batch_size=32,
+        trim_top_db: Optional[float]=20,
+        **kwargs
+    ):
+        """
+        Wrapper around embeds_from_mels
+
+        :param trim_top_db: this argument was only added for the sake of compatibility with metavoice's implementation
+        """
+        if sample_rate != self.hp.sample_rate:
+            wavs = [
+                librosa.resample(wav, orig_sr=sample_rate, target_sr=self.hp.sample_rate, res_type="kaiser_fast")
+                for wav in wavs
+            ]
+
+        if trim_top_db:
+            wavs = [librosa.effects.trim(wav, top_db=trim_top_db)[0] for wav in wavs]
+
+        if "rate" not in kwargs:
+            kwargs["rate"] = 1.3  # Resemble's default value.
+
+        mels = [melspectrogram(w, self.hp).T for w in wavs]
+
+        return self.embeds_from_mels(mels, as_spk=as_spk, batch_size=batch_size, **kwargs)

src/chatterbox/tts.py

@@ -0,0 +1,244 @@
+from dataclasses import dataclass
+from pathlib import Path
+
+import librosa
+import torch
+import perth
+import torch.nn.functional as F
+from huggingface_hub import hf_hub_download
+
+from .models.t3 import T3
+from .models.s3tokenizer import S3_SR, drop_invalid_tokens
+from .models.s3gen import S3GEN_SR, S3Gen
+from .models.tokenizers import EnTokenizer
+from .models.voice_encoder import VoiceEncoder
+from .models.t3.modules.cond_enc import T3Cond
+
+
+REPO_ID = "ResembleAI/chatterbox"
+
+
+def punc_norm(text: str) -> str:
+    """
+        Quick cleanup func for punctuation from LLMs or
+        containing chars not seen often in the dataset
+    """
+    if len(text) == 0:
+        return "You need to add some text for me to talk."
+
+    # Capitalise first letter
+    if text[0].islower():
+        text = text[0].upper() + text[1:]
+
+    # Remove multiple space chars
+    text = " ".join(text.split())
+
+    # Replace uncommon/llm punc
+    punc_to_replace = [
+        ("...", ", "),
+        ("…", ", "),
+        (":", ","),
+        (" - ", ", "),
+        (";", ", "),
+        ("—", "-"),
+        ("–", "-"),
+        (" ,", ","),
+        ("“", "\""),
+        ("”", "\""),
+        ("‘", "'"),
+        ("’", "'"),
+    ]
+    for old_char_sequence, new_char in punc_to_replace:
+        text = text.replace(old_char_sequence, new_char)
+
+    # Add full stop if no ending punc
+    text = text.rstrip(" ")
+    sentence_enders = {".", "!", "?", "-", ","}
+    if not any(text.endswith(p) for p in sentence_enders):
+        text += "."
+
+    return text
+
+
+@dataclass
+class Conditionals:
+    """
+    Conditionals for T3 and S3Gen
+    - T3 conditionals:
+        - speaker_emb
+        - clap_emb
+        - cond_prompt_speech_tokens
+        - cond_prompt_speech_emb
+        - emotion_adv
+    - S3Gen conditionals:
+        - prompt_token
+        - prompt_token_len
+        - prompt_feat
+        - prompt_feat_len
+        - embedding
+    """
+    t3: T3Cond
+    gen: dict
+
+    def to(self, device):
+        self.t3 = self.t3.to(device=device)
+        for k, v in self.gen.items():
+            if torch.is_tensor(v):
+                self.gen[k] = v.to(device=device)
+        return self
+
+    def save(self, fpath: Path):
+        arg_dict = dict(
+            t3=self.t3.__dict__,
+            gen=self.gen
+        )
+        torch.save(arg_dict, fpath)
+
+    @classmethod
+    def load(cls, fpath, map_location="cpu"):
+        kwargs = torch.load(fpath, map_location=map_location, weights_only=True)
+        return cls(T3Cond(**kwargs['t3']), kwargs['gen'])
+
+
+class ChatterboxTTS:
+    ENC_COND_LEN = 6 * S3_SR
+    DEC_COND_LEN = 10 * S3GEN_SR
+
+    def __init__(
+        self,
+        t3: T3,
+        s3gen: S3Gen,
+        ve: VoiceEncoder,
+        tokenizer: EnTokenizer,
+        device: str,
+        conds: Conditionals = None,
+    ):
+        self.sr = S3GEN_SR  # sample rate of synthesized audio
+        self.t3 = t3
+        self.s3gen = s3gen
+        self.ve = ve
+        self.tokenizer = tokenizer
+        self.device = device
+        self.conds = conds
+        self.watermarker = perth.PerthImplicitWatermarker()
+
+    @classmethod
+    def from_local(cls, ckpt_dir, device) -> 'ChatterboxTTS':
+        ckpt_dir = Path(ckpt_dir)
+
+        ve = VoiceEncoder()
+        ve.load_state_dict(
+            torch.load(ckpt_dir / "ve.pt")
+        )
+        ve.to(device).eval()
+
+        t3 = T3()
+        t3_state = torch.load(ckpt_dir / "t3_cfg.pt")
+        if "model" in t3_state.keys():
+            t3_state = t3_state["model"][0]
+        t3.load_state_dict(t3_state)
+        t3.to(device).eval()
+
+        s3gen = S3Gen()
+        s3gen.load_state_dict(
+            torch.load(ckpt_dir / "s3gen.pt")
+        )
+        s3gen.to(device).eval()
+
+        tokenizer = EnTokenizer(
+            str(ckpt_dir / "tokenizer.json")
+        )
+
+        conds = None
+        if (builtin_voice := ckpt_dir / "conds.pt").exists():
+            conds = Conditionals.load(builtin_voice).to(device)
+
+        return cls(t3, s3gen, ve, tokenizer, device, conds=conds)
+
+    @classmethod
+    def from_pretrained(cls, device) -> 'ChatterboxTTS':
+        for fpath in ["ve.pt", "t3_cfg.pt", "s3gen.pt", "tokenizer.json", "conds.pt"]:
+            local_path = hf_hub_download(repo_id=REPO_ID, filename=fpath)
+
+        return cls.from_local(Path(local_path).parent, device)
+
+    def prepare_conditionals(self, wav_fpath, exaggeration=0.5):
+        ## Load reference wav
+        s3gen_ref_wav, _sr = librosa.load(wav_fpath, sr=S3GEN_SR)
+
+        ref_16k_wav = librosa.resample(s3gen_ref_wav, orig_sr=S3GEN_SR, target_sr=S3_SR)
+
+        s3gen_ref_wav = s3gen_ref_wav[:self.DEC_COND_LEN]
+        s3gen_ref_dict = self.s3gen.embed_ref(s3gen_ref_wav, S3GEN_SR, device=self.device)
+
+        # Speech cond prompt tokens
+        if plen := self.t3.hp.speech_cond_prompt_len:
+            s3_tokzr = self.s3gen.tokenizer
+            t3_cond_prompt_tokens, _ = s3_tokzr.forward([ref_16k_wav[:self.ENC_COND_LEN]], max_len=plen)
+            t3_cond_prompt_tokens = torch.atleast_2d(t3_cond_prompt_tokens).to(self.device)
+
+        # Voice-encoder speaker embedding
+        ve_embed = torch.from_numpy(self.ve.embeds_from_wavs([ref_16k_wav], sample_rate=S3_SR))
+        ve_embed = ve_embed.mean(axis=0, keepdim=True).to(self.device)
+
+        t3_cond = T3Cond(
+            speaker_emb=ve_embed,
+            cond_prompt_speech_tokens=t3_cond_prompt_tokens,
+            emotion_adv=exaggeration * torch.ones(1, 1, 1),
+        ).to(device=self.device)
+        self.conds = Conditionals(t3_cond, s3gen_ref_dict)
+
+    def generate(
+        self,
+        text,
+        audio_prompt_path=None,
+        exaggeration=0.5,
+        cfg_weight=0.5,
+        temperature=0.8,
+    ):
+        if audio_prompt_path:
+            self.prepare_conditionals(audio_prompt_path, exaggeration=exaggeration)
+        else:
+            assert self.conds is not None, "Please `prepare_conditionals` first or specify `audio_prompt_path`"
+
+        # Update exaggeration if needed
+        if exaggeration != self.conds.t3.emotion_adv[0, 0, 0]:
+            _cond: T3Cond = self.conds.t3
+            self.conds.t3 = T3Cond(
+                speaker_emb=_cond.speaker_emb,
+                cond_prompt_speech_tokens=_cond.cond_prompt_speech_tokens,
+                emotion_adv=exaggeration * torch.ones(1, 1, 1),
+            ).to(device=self.device)
+
+        # Norm and tokenize text
+        text = punc_norm(text)
+        text_tokens = self.tokenizer.text_to_tokens(text).to(self.device)
+        text_tokens = torch.cat([text_tokens, text_tokens], dim=0)  # Need two seqs for CFG
+
+        sot = self.t3.hp.start_text_token
+        eot = self.t3.hp.stop_text_token
+        text_tokens = F.pad(text_tokens, (1, 0), value=sot)
+        text_tokens = F.pad(text_tokens, (0, 1), value=eot)
+
+        with torch.inference_mode():
+            speech_tokens = self.t3.inference(
+                t3_cond=self.conds.t3,
+                text_tokens=text_tokens,
+                max_new_tokens=1000,  # TODO: use the value in config
+                temperature=temperature,
+                cfg_weight=cfg_weight,
+            )
+            # Extract only the conditional batch.
+            speech_tokens = speech_tokens[0]
+
+            # TODO: output becomes 1D
+            speech_tokens = drop_invalid_tokens(speech_tokens)
+            speech_tokens = speech_tokens.to(self.device)
+
+            wav, _ = self.s3gen.inference(
+                speech_tokens=speech_tokens,
+                ref_dict=self.conds.gen,
+            )
+            wav = wav.squeeze(0).detach().cpu().numpy()
+            watermarked_wav = self.watermarker.apply_watermark(wav, sample_rate=self.sr)
+        return torch.from_numpy(watermarked_wav).unsqueeze(0)

src/chatterbox/vc.py

@@ -0,0 +1,88 @@
+from pathlib import Path
+
+import librosa
+import torch
+import perth
+from huggingface_hub import hf_hub_download
+
+from .models.s3tokenizer import S3_SR
+from .models.s3gen import S3GEN_SR, S3Gen
+
+
+REPO_ID = "ResembleAI/chatterbox"
+
+
+class ChatterboxVC:
+    ENC_COND_LEN = 6 * S3_SR
+    DEC_COND_LEN = 10 * S3GEN_SR
+
+    def __init__(
+        self,
+        s3gen: S3Gen,
+        device: str,
+        ref_dict: dict=None,
+    ):
+        self.sr = S3GEN_SR
+        self.s3gen = s3gen
+        self.device = device
+        self.watermarker = perth.PerthImplicitWatermarker()
+        if ref_dict is None:
+            self.ref_dict = None
+        else:
+            self.ref_dict = {
+                k: v.to(device) if torch.is_tensor(v) else v
+                for k, v in ref_dict.items()
+            }
+
+    @classmethod
+    def from_local(cls, ckpt_dir, device) -> 'ChatterboxVC':
+        ckpt_dir = Path(ckpt_dir)
+        ref_dict = None
+        if (builtin_voice := ckpt_dir / "conds.pt").exists():
+            states = torch.load(builtin_voice)
+            ref_dict = states['gen']
+
+        s3gen = S3Gen()
+        s3gen.load_state_dict(
+            torch.load(ckpt_dir / "s3gen.pt")
+        )
+        s3gen.to(device).eval()
+
+        return cls(s3gen, device, ref_dict=ref_dict)
+
+    @classmethod
+    def from_pretrained(cls, device) -> 'ChatterboxVC':
+        for fpath in ["s3gen.pt", "conds.pt"]:
+            local_path = hf_hub_download(repo_id=REPO_ID, filename=fpath)
+
+        return cls.from_local(Path(local_path).parent, device)
+
+    def set_target_voice(self, wav_fpath):
+        ## Load reference wav
+        s3gen_ref_wav, _sr = librosa.load(wav_fpath, sr=S3GEN_SR)
+
+        s3gen_ref_wav = s3gen_ref_wav[:self.DEC_COND_LEN]
+        self.ref_dict = self.s3gen.embed_ref(s3gen_ref_wav, S3GEN_SR, device=self.device)
+
+    def generate(
+        self,
+        audio,
+        target_voice_path=None,
+    ):
+        if target_voice_path:
+            self.set_target_voice(target_voice_path)
+        else:
+            assert self.ref_dict is not None, "Please `prepare_conditionals` first or specify `target_voice_path`"
+
+        with torch.inference_mode():
+            audio_16, _ = librosa.load(audio, sr=S3_SR)
+            audio_16 = torch.from_numpy(audio_16).float().to(self.device)[None, ]
+
+            s3_tokens, _ = self.s3gen.tokenizer(audio_16)
+            wav, _ = self.s3gen.inference(
+                speech_tokens=s3_tokens,
+                ref_dict=self.ref_dict,
+            )
+            wav = wav.squeeze(0).detach().cpu().numpy()
+            watermarked_wav = self.watermarker.apply_watermark(wav, sample_rate=self.sr)
+        return torch.from_numpy(watermarked_wav).unsqueeze(0)