140 lines
5.2 KiB
Python
140 lines
5.2 KiB
Python
import torch
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import torch.nn as nn
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import os
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from transformers import (
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CLIPTextModelWithProjection,
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CLIPTokenizer,
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T5EncoderModel,
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T5TokenizerFast,
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)
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from typing import Any, Callable, Dict, List, Optional, Union
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class SD3TextEncoderWithMask(nn.Module):
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def __init__(self, model_path, torch_dtype):
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super().__init__()
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# CLIP-L
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self.tokenizer = CLIPTokenizer.from_pretrained(os.path.join(model_path, 'tokenizer'))
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self.tokenizer_max_length = self.tokenizer.model_max_length
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self.text_encoder = CLIPTextModelWithProjection.from_pretrained(os.path.join(model_path, 'text_encoder'), torch_dtype=torch_dtype)
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# CLIP-G
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self.tokenizer_2 = CLIPTokenizer.from_pretrained(os.path.join(model_path, 'tokenizer_2'))
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self.text_encoder_2 = CLIPTextModelWithProjection.from_pretrained(os.path.join(model_path, 'text_encoder_2'), torch_dtype=torch_dtype)
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# T5
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self.tokenizer_3 = T5TokenizerFast.from_pretrained(os.path.join(model_path, 'tokenizer_3'))
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self.text_encoder_3 = T5EncoderModel.from_pretrained(os.path.join(model_path, 'text_encoder_3'), torch_dtype=torch_dtype)
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self._freeze()
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def _freeze(self):
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for param in self.parameters():
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param.requires_grad = False
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def _get_t5_prompt_embeds(
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self,
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prompt: Union[str, List[str]] = None,
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num_images_per_prompt: int = 1,
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device: Optional[torch.device] = None,
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max_sequence_length: int = 128,
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):
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prompt = [prompt] if isinstance(prompt, str) else prompt
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batch_size = len(prompt)
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text_inputs = self.tokenizer_3(
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prompt,
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padding="max_length",
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max_length=max_sequence_length,
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truncation=True,
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add_special_tokens=True,
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return_tensors="pt",
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)
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text_input_ids = text_inputs.input_ids
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prompt_attention_mask = text_inputs.attention_mask
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prompt_attention_mask = prompt_attention_mask.to(device)
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prompt_embeds = self.text_encoder_3(text_input_ids.to(device), attention_mask=prompt_attention_mask)[0]
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dtype = self.text_encoder_3.dtype
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prompt_embeds = prompt_embeds.to(dtype=dtype, device=device)
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_, seq_len, _ = prompt_embeds.shape
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# duplicate text embeddings and attention mask for each generation per prompt, using mps friendly method
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prompt_embeds = prompt_embeds.repeat(1, num_images_per_prompt, 1)
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prompt_embeds = prompt_embeds.view(batch_size * num_images_per_prompt, seq_len, -1)
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prompt_attention_mask = prompt_attention_mask.view(batch_size, -1)
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prompt_attention_mask = prompt_attention_mask.repeat(num_images_per_prompt, 1)
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return prompt_embeds, prompt_attention_mask
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def _get_clip_prompt_embeds(
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self,
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prompt: Union[str, List[str]],
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num_images_per_prompt: int = 1,
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device: Optional[torch.device] = None,
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clip_skip: Optional[int] = None,
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clip_model_index: int = 0,
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):
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clip_tokenizers = [self.tokenizer, self.tokenizer_2]
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clip_text_encoders = [self.text_encoder, self.text_encoder_2]
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tokenizer = clip_tokenizers[clip_model_index]
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text_encoder = clip_text_encoders[clip_model_index]
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batch_size = len(prompt)
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text_inputs = tokenizer(
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prompt,
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padding="max_length",
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max_length=self.tokenizer_max_length,
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truncation=True,
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return_tensors="pt",
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)
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text_input_ids = text_inputs.input_ids
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prompt_embeds = text_encoder(text_input_ids.to(device), output_hidden_states=True)
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pooled_prompt_embeds = prompt_embeds[0]
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pooled_prompt_embeds = pooled_prompt_embeds.repeat(1, num_images_per_prompt, 1)
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pooled_prompt_embeds = pooled_prompt_embeds.view(batch_size * num_images_per_prompt, -1)
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return pooled_prompt_embeds
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def encode_prompt(self,
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prompt,
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num_images_per_prompt=1,
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clip_skip: Optional[int] = None,
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device=None,
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):
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prompt = [prompt] if isinstance(prompt, str) else prompt
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pooled_prompt_embed = self._get_clip_prompt_embeds(
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prompt=prompt,
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device=device,
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num_images_per_prompt=num_images_per_prompt,
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clip_skip=clip_skip,
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clip_model_index=0,
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)
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pooled_prompt_2_embed = self._get_clip_prompt_embeds(
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prompt=prompt,
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device=device,
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num_images_per_prompt=num_images_per_prompt,
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clip_skip=clip_skip,
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clip_model_index=1,
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)
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pooled_prompt_embeds = torch.cat([pooled_prompt_embed, pooled_prompt_2_embed], dim=-1)
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prompt_embeds, prompt_attention_mask = self._get_t5_prompt_embeds(
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prompt=prompt,
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num_images_per_prompt=num_images_per_prompt,
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device=device,
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)
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return prompt_embeds, prompt_attention_mask, pooled_prompt_embeds
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def forward(self, input_prompts, device):
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with torch.no_grad():
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prompt_embeds, prompt_attention_mask, pooled_prompt_embeds = self.encode_prompt(input_prompts, 1, clip_skip=None, device=device)
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return prompt_embeds, prompt_attention_mask, pooled_prompt_embeds |