# SPDX-License-Identifier: Apache-2.0 # Adapted from vllm: https://github.com/vllm-project/vllm/blob/v0.7.3/vllm/utils.py import argparse import ctypes import hashlib import importlib import inspect import json import math import os import signal import sys import tempfile import traceback from collections.abc import Callable from dataclasses import fields, is_dataclass from functools import partial, wraps from typing import Any, TypeVar, cast import cloudpickle import filelock import torch import yaml from huggingface_hub import snapshot_download import fastvideo.v1.envs as envs from fastvideo.v1.logger import init_logger logger = init_logger(__name__) T = TypeVar("T") # TODO(will): used to convert fastvideo_args.precision to torch.dtype. Find a # cleaner way to do this. PRECISION_TO_TYPE = { "fp32": torch.float32, "fp16": torch.float16, "bf16": torch.bfloat16, } STR_BACKEND_ENV_VAR: str = "FASTVIDEO_ATTENTION_BACKEND" STR_ATTN_CONFIG_ENV_VAR: str = "FASTVIDEO_ATTENTION_CONFIG" def find_nccl_library() -> str: """ We either use the library file specified by the `VLLM_NCCL_SO_PATH` environment variable, or we find the library file brought by PyTorch. After importing `torch`, `libnccl.so.2` or `librccl.so.1` can be found by `ctypes` automatically. """ so_file = envs.FASTVIDEO_NCCL_SO_PATH # manually load the nccl library if so_file: logger.info( "Found nccl from environment variable FASTVIDEO_NCCL_SO_PATH=%s", so_file) else: if torch.version.cuda is not None: so_file = "libnccl.so.2" elif torch.version.hip is not None: so_file = "librccl.so.1" else: raise ValueError("NCCL only supports CUDA and ROCm backends.") logger.info("Found nccl from library %s", so_file) return str(so_file) prev_set_stream = torch.cuda.set_stream _current_stream = None def _patched_set_stream(stream: torch.cuda.Stream) -> None: global _current_stream _current_stream = stream prev_set_stream(stream) torch.cuda.set_stream = _patched_set_stream def current_stream() -> torch.cuda.Stream: """ replace `torch.cuda.current_stream()` with `fastvideo.v1.utils.current_stream()`. it turns out that `torch.cuda.current_stream()` is quite expensive, as it will construct a new stream object at each call. here we patch `torch.cuda.set_stream` to keep track of the current stream directly, so that we can avoid calling `torch.cuda.current_stream()`. the underlying hypothesis is that we do not call `torch._C._cuda_setStream` from C/C++ code. """ from fastvideo.v1.platforms import current_platform global _current_stream if _current_stream is None: # when this function is called before any stream is set, # we return the default stream. # On ROCm using the default 0 stream in combination with RCCL # is hurting performance. Therefore creating a dedicated stream # per process _current_stream = torch.cuda.Stream() if current_platform.is_rocm( ) else torch.cuda.current_stream() return _current_stream class StoreBoolean(argparse.Action): def __init__(self, option_strings, dest, default=False, required=False, help=None): super().__init__(option_strings=option_strings, dest=dest, nargs='?', const=True, default=default, required=required, help=help) def __call__(self, parser, namespace, values, option_string=None): if values is None: setattr(namespace, self.dest, True) elif isinstance(values, str): if values.lower() == "true": setattr(namespace, self.dest, True) elif values.lower() == "false": setattr(namespace, self.dest, False) else: raise ValueError(f"Invalid boolean value: {values}. " "Expected 'true' or 'false'.") else: setattr(namespace, self.dest, bool(values)) class SortedHelpFormatter(argparse.HelpFormatter): """SortedHelpFormatter that sorts arguments by their option strings.""" def add_arguments(self, actions): actions = sorted(actions, key=lambda x: x.option_strings) super().add_arguments(actions) class FlexibleArgumentParser(argparse.ArgumentParser): """ArgumentParser that allows both underscore and dash in names.""" def __init__(self, *args, **kwargs) -> None: # Set the default 'formatter_class' to SortedHelpFormatter if 'formatter_class' not in kwargs: kwargs['formatter_class'] = SortedHelpFormatter super().__init__(*args, **kwargs) def parse_args( # type: ignore[override] self, args=None, namespace=None) -> argparse.Namespace: if args is None: args = sys.argv[1:] if '--config' in args: args = self._pull_args_from_config(args) # Convert underscores to dashes and vice versa in argument names processed_args = [] for arg in args: if arg.startswith('--'): if '=' in arg: key, value = arg.split('=', 1) key = '--' + key[len('--'):].replace('_', '-') processed_args.append(f'{key}={value}') else: processed_args.append('--' + arg[len('--'):].replace('_', '-')) elif arg.startswith('-O') and arg != '-O' and len(arg) == 2: # allow -O flag to be used without space, e.g. -O3 processed_args.append('-O') processed_args.append(arg[2:]) else: processed_args.append(arg) namespace = super().parse_args(processed_args, namespace) # Track which arguments were explicitly provided namespace._provided = set() i = 0 while i < len(args): arg = args[i] if arg.startswith('--'): # Handle --key=value format if '=' in arg: key = arg.split('=')[0][2:].replace('-', '_') namespace._provided.add(key) i += 1 # Handle --key value format else: key = arg[2:].replace('-', '_') namespace._provided.add(key) # Skip the value if there is one if i + 1 < len(args) and not args[i + 1].startswith('-'): i += 2 else: i += 1 else: i += 1 return namespace # type: ignore[no-any-return] def _pull_args_from_config(self, args: list[str]) -> list[str]: """Method to pull arguments specified in the config file into the command-line args variable. The arguments in config file will be inserted between the argument list. example: ```yaml port: 12323 tensor-parallel-size: 4 ``` ```python $: vllm {serve,chat,complete} "facebook/opt-12B" \ --config config.yaml -tp 2 $: args = [ "serve,chat,complete", "facebook/opt-12B", '--config', 'config.yaml', '-tp', '2' ] $: args = [ "serve,chat,complete", "facebook/opt-12B", '--port', '12323', '--tensor-parallel-size', '4', '-tp', '2' ] ``` Please note how the config args are inserted after the sub command. this way the order of priorities is maintained when these are args parsed by super(). """ assert args.count( '--config') <= 1, "More than one config file specified!" index = args.index('--config') if index == len(args) - 1: raise ValueError("No config file specified! \ Please check your command-line arguments.") file_path = args[index + 1] config_args = self._load_config_file(file_path) # 0th index is for {serve,chat,complete} # followed by model_tag (only for serve) # followed by config args # followed by rest of cli args. # maintaining this order will enforce the precedence # of cli > config > defaults if args[0] == "serve": if index == 1: raise ValueError( "No model_tag specified! Please check your command-line" " arguments.") args = [args[0]] + [ args[1] ] + config_args + args[2:index] + args[index + 2:] else: args = [args[0]] + config_args + args[1:index] + args[index + 2:] return args def _load_config_file(self, file_path: str) -> list[str]: """Loads a yaml file and returns the key value pairs as a flattened list with argparse like pattern ```yaml port: 12323 tensor-parallel-size: 4 vae_config: load_encoder: false load_decoder: true ``` returns: processed_args: list[str] = [ '--port': '12323', '--tensor-parallel-size': '4', '--vae-config.load-encoder': 'false', '--vae-config.load-decoder': 'true' ] """ extension: str = file_path.split('.')[-1] if extension not in ('yaml', 'yml', 'json'): raise ValueError( "Config file must be of a yaml/yml/json type.\ %s supplied", extension) processed_args: list[str] = [] config: dict[str, Any] = {} try: with open(file_path) as config_file: config = yaml.safe_load(config_file) except Exception as ex: logger.error( "Unable to read the config file at %s. \ Make sure path is correct", file_path) raise ex store_boolean_arguments = [ action.dest for action in self._actions if isinstance(action, StoreBoolean) ] def process_dict(prefix: str, d: dict[str, Any]): for key, value in d.items(): full_key = f"{prefix}.{key}" if prefix else key if isinstance(value, bool) and full_key not in store_boolean_arguments: if value: processed_args.append('--' + full_key) else: processed_args.append('--' + full_key) processed_args.append('false') elif isinstance(value, list): processed_args.append('--' + full_key) for item in value: processed_args.append(str(item)) elif isinstance(value, dict): process_dict(full_key, value) else: processed_args.append('--' + full_key) processed_args.append(str(value)) process_dict("", config) return processed_args def get_lock(model_name_or_path: str): lock_dir = tempfile.gettempdir() os.makedirs(os.path.dirname(lock_dir), exist_ok=True) model_name = model_name_or_path.replace("/", "-") hash_name = hashlib.sha256(model_name.encode()).hexdigest() # add hash to avoid conflict with old users' lock files lock_file_name = hash_name + model_name + ".lock" # mode 0o666 is required for the filelock to be shared across users lock = filelock.FileLock(os.path.join(lock_dir, lock_file_name), mode=0o666) return lock def warn_for_unimplemented_methods(cls: type[T]) -> type[T]: """ A replacement for `abc.ABC`. When we use `abc.ABC`, subclasses will fail to instantiate if they do not implement all abstract methods. Here, we only require `raise NotImplementedError` in the base class, and log a warning if the method is not implemented in the subclass. """ original_init = cls.__init__ def find_unimplemented_methods(self: object): unimplemented_methods = [] for attr_name in dir(self): # bypass inner method if attr_name.startswith('_'): continue try: attr = getattr(self, attr_name) # get the func of callable method if callable(attr): attr_func = attr.__func__ except AttributeError: continue src = inspect.getsource(attr_func) if "NotImplementedError" in src: unimplemented_methods.append(attr_name) if unimplemented_methods: method_names = ','.join(unimplemented_methods) msg = (f"Methods {method_names} not implemented in {self}") logger.warning(msg) @wraps(original_init) def wrapped_init(self, *args, **kwargs) -> None: original_init(self, *args, **kwargs) find_unimplemented_methods(self) type.__setattr__(cls, '__init__', wrapped_init) return cls def align_to(value: int, alignment: int) -> int: """align height, width according to alignment Args: value (int): height or width alignment (int): target alignment factor Returns: int: the aligned value """ return int(math.ceil(value / alignment) * alignment) def resolve_obj_by_qualname(qualname: str) -> Any: """ Resolve an object by its fully qualified name. """ module_name, obj_name = qualname.rsplit(".", 1) module = importlib.import_module(module_name) return getattr(module, obj_name) # From vllm: https://github.com/vllm-project/vllm/blob/v0.7.3/vllm/utils.py def import_pynvml(): """ Historical comments: libnvml.so is the library behind nvidia-smi, and pynvml is a Python wrapper around it. We use it to get GPU status without initializing CUDA context in the current process. Historically, there are two packages that provide pynvml: - `nvidia-ml-py` (https://pypi.org/project/nvidia-ml-py/): The official wrapper. It is a dependency of FastVideo, and is installed when users install FastVideo. It provides a Python module named `pynvml`. - `pynvml` (https://pypi.org/project/pynvml/): An unofficial wrapper. Prior to version 12.0, it also provides a Python module `pynvml`, and therefore conflicts with the official one which is a standalone Python file. This causes errors when both of them are installed. Starting from version 12.0, it migrates to a new module named `pynvml_utils` to avoid the conflict. It is so confusing that many packages in the community use the unofficial one by mistake, and we have to handle this case. For example, `nvcr.io/nvidia/pytorch:24.12-py3` uses the unofficial one, and it will cause errors, see the issue https://github.com/vllm-project/vllm/issues/12847 for example. After all the troubles, we decide to copy the official `pynvml` module to our codebase, and use it directly. """ import fastvideo.v1.third_party.pynvml as pynvml return pynvml def maybe_download_model(model_path: str, local_dir: str | None = None, download: bool = True) -> str: """ Check if the model path is a Hugging Face Hub model ID and download it if needed. Args: model_path: Local path or Hugging Face Hub model ID local_dir: Local directory to save the model download: Whether to download the model from Hugging Face Hub Returns: Local path to the model """ # If the path exists locally, return it if os.path.exists(model_path): logger.info("Model already exists locally at %s", model_path) return model_path # Otherwise, assume it's a HF Hub model ID and try to download it try: logger.info("Downloading model snapshot from HF Hub for %s...", model_path) with get_lock(model_path): local_path = snapshot_download( repo_id=model_path, ignore_patterns=["*.onnx", "*.msgpack"], local_dir=local_dir) logger.info("Downloaded model to %s", local_path) return str(local_path) except Exception as e: raise ValueError( f"Could not find model at {model_path} and failed to download from HF Hub: {e}" ) from e def verify_model_config_and_directory(model_path: str) -> dict[str, Any]: """ Verify that the model directory contains a valid diffusers configuration. Args: model_path: Path to the model directory Returns: The loaded model configuration as a dictionary """ # Check for model_index.json which is required for diffusers models config_path = os.path.join(model_path, "model_index.json") if not os.path.exists(config_path): raise ValueError( f"Model directory {model_path} does not contain model_index.json. " "Only Hugging Face diffusers format is supported.") # Check for transformer and vae directories transformer_dir = os.path.join(model_path, "transformer") vae_dir = os.path.join(model_path, "vae") if not os.path.exists(transformer_dir): raise ValueError( f"Model directory {model_path} does not contain a transformer/ directory." ) if not os.path.exists(vae_dir): raise ValueError( f"Model directory {model_path} does not contain a vae/ directory.") # Load the config with open(config_path) as f: config = json.load(f) # Verify diffusers version exists if "_diffusers_version" not in config: raise ValueError("model_index.json does not contain _diffusers_version") logger.info("Diffusers version: %s", config["_diffusers_version"]) return cast(dict[str, Any], config) def maybe_download_model_index(model_name_or_path: str) -> dict[str, Any]: """ Download and extract just the model_index.json for a Hugging Face model. Args: model_name_or_path: Path or HF Hub model ID Returns: The parsed model_index.json as a dictionary """ import tempfile from huggingface_hub import hf_hub_download # If it's a local path, verify it directly if os.path.exists(model_name_or_path): return verify_model_config_and_directory(model_name_or_path) # For remote models, download just the model_index.json try: with tempfile.TemporaryDirectory() as tmp_dir: # Download just the model_index.json file model_index_path = hf_hub_download(repo_id=model_name_or_path, filename="model_index.json", local_dir=tmp_dir) # Load the model_index.json with open(model_index_path) as f: config: dict[str, Any] = json.load(f) # Verify it has the required fields if "_class_name" not in config: raise ValueError( f"model_index.json for {model_name_or_path} does not contain _class_name field" ) if "_diffusers_version" not in config: raise ValueError( f"model_index.json for {model_name_or_path} does not contain _diffusers_version field" ) # Add the pipeline name for downstream use config["pipeline_name"] = config["_class_name"] logger.info("Downloaded model_index.json for %s, pipeline: %s", model_name_or_path, config["_class_name"]) return config except Exception as e: raise ValueError( f"Failed to download or parse model_index.json for {model_name_or_path}: {e}" ) from e def update_environment_variables(envs: dict[str, str]): for k, v in envs.items(): if k in os.environ and os.environ[k] != v: logger.warning( "Overwriting environment variable %s " "from '%s' to '%s'", k, os.environ[k], v) os.environ[k] = v def run_method(obj: Any, method: str | bytes | Callable, args: tuple[Any], kwargs: dict[str, Any]) -> Any: """ Run a method of an object with the given arguments and keyword arguments. If the method is string, it will be converted to a method using getattr. If the method is serialized bytes and will be deserialized using cloudpickle. If the method is a callable, it will be called directly. """ if isinstance(method, bytes): func = partial(cloudpickle.loads(method), obj) elif isinstance(method, str): try: func = getattr(obj, method) except AttributeError: raise NotImplementedError(f"Method {method!r} is not" " implemented.") from None else: func = partial(method, obj) # type: ignore return func(*args, **kwargs) def shallow_asdict(obj) -> dict[str, Any]: if not is_dataclass(obj): raise TypeError("Expected dataclass instance") return {f.name: getattr(obj, f.name) for f in fields(obj)} def kill_itself_when_parent_died() -> None: # if sys.platform == "linux": # sigkill this process when parent worker manager dies PR_SET_PDEATHSIG = 1 libc = ctypes.CDLL("libc.so.6") libc.prctl(PR_SET_PDEATHSIG, signal.SIGKILL) # else: # logger.warning("kill_itself_when_parent_died is only supported in linux.") def get_exception_traceback() -> str: etype, value, tb = sys.exc_info() err_str = "".join(traceback.format_exception(etype, value, tb)) return err_str class TypeBasedDispatcher: def __init__(self, mapping: list[tuple[type, Callable]]): self._mapping = mapping def __call__(self, obj: Any): for ty, fn in self._mapping: if isinstance(obj, ty): return fn(obj) raise ValueError(f"Invalid object: {obj}")