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96 lines
3.5 KiB
Python
96 lines
3.5 KiB
Python
# code borrowed from: https://github.com/huggingface/peft/blob/v0.12.0/src/peft/utils/save_and_load.py#L420
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import os
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from typing import Optional
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import torch
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from huggingface_hub import file_exists, hf_hub_download
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from huggingface_hub.utils import EntryNotFoundError
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from safetensors.torch import load_file as safe_load_file
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from vllm.platforms import current_platform
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WEIGHTS_NAME = "adapter_model.bin"
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SAFETENSORS_WEIGHTS_NAME = "adapter_model.safetensors"
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# Get current device name based on available devices
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def infer_device() -> str:
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if current_platform.is_cuda_alike():
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return "cuda"
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return "cpu"
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def load_peft_weights(model_id: str,
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device: Optional[str] = None,
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**hf_hub_download_kwargs) -> dict:
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r"""
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A helper method to load the PEFT weights from the HuggingFace Hub or locally
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Args:
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model_id (`str`):
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The local path to the adapter weights or the name of the adapter to
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load from the HuggingFace Hub.
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device (`str`):
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The device to load the weights onto.
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hf_hub_download_kwargs (`dict`):
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Additional arguments to pass to the `hf_hub_download` method when
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loading from the HuggingFace Hub.
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"""
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path = (os.path.join(model_id, hf_hub_download_kwargs["subfolder"])
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if hf_hub_download_kwargs.get("subfolder", None) is not None else
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model_id)
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if device is None:
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device = infer_device()
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if os.path.exists(os.path.join(path, SAFETENSORS_WEIGHTS_NAME)):
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filename = os.path.join(path, SAFETENSORS_WEIGHTS_NAME)
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use_safetensors = True
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elif os.path.exists(os.path.join(path, WEIGHTS_NAME)):
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filename = os.path.join(path, WEIGHTS_NAME)
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use_safetensors = False
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else:
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token = hf_hub_download_kwargs.get("token", None)
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if token is None:
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token = hf_hub_download_kwargs.get("use_auth_token", None)
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hub_filename = (os.path.join(hf_hub_download_kwargs["subfolder"],
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SAFETENSORS_WEIGHTS_NAME)
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if hf_hub_download_kwargs.get("subfolder", None)
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is not None else SAFETENSORS_WEIGHTS_NAME)
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has_remote_safetensors_file = file_exists(
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repo_id=model_id,
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filename=hub_filename,
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revision=hf_hub_download_kwargs.get("revision", None),
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repo_type=hf_hub_download_kwargs.get("repo_type", None),
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token=token,
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)
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use_safetensors = has_remote_safetensors_file
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if has_remote_safetensors_file:
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# Priority 1: load safetensors weights
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filename = hf_hub_download(
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model_id,
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SAFETENSORS_WEIGHTS_NAME,
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**hf_hub_download_kwargs,
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)
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else:
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try:
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filename = hf_hub_download(model_id, WEIGHTS_NAME,
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**hf_hub_download_kwargs)
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except EntryNotFoundError:
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raise ValueError( # noqa: B904
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f"Can't find weights for {model_id} in {model_id} or \
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in the Hugging Face Hub. "
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f"Please check that the file {WEIGHTS_NAME} or \
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{SAFETENSORS_WEIGHTS_NAME} is present at {model_id}.")
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if use_safetensors:
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adapters_weights = safe_load_file(filename, device=device)
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else:
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adapters_weights = torch.load(filename,
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map_location=torch.device(device))
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return adapters_weights
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