149 lines
5.3 KiB
Python
149 lines
5.3 KiB
Python
import os
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from typing import Optional, Union
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from transformers import (AutoTokenizer, PreTrainedTokenizer,
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PreTrainedTokenizerFast)
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from vllm.config import VLLM_USE_MODELSCOPE
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from vllm.logger import init_logger
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from vllm.lora.request import LoRARequest
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from vllm.transformers_utils.tokenizers import BaichuanTokenizer
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from vllm.utils import make_async
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logger = init_logger(__name__)
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def get_cached_tokenizer(
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tokenizer: Union[PreTrainedTokenizer, PreTrainedTokenizerFast]
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) -> Union[PreTrainedTokenizer, PreTrainedTokenizerFast]:
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"""Get tokenizer with cached properties.
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This will patch the tokenizer object in place.
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By default, transformers will recompute multiple tokenizer properties
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each time they are called, leading to a significant slowdown. This
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function caches these properties for faster access."""
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tokenizer_all_special_ids = set(tokenizer.all_special_ids)
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tokenizer_all_special_tokens_extended = (
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tokenizer.all_special_tokens_extended)
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tokenizer_all_special_tokens = set(tokenizer.all_special_tokens)
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tokenizer_len = len(tokenizer)
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class CachedTokenizer(tokenizer.__class__): # type: ignore
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@property
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def all_special_ids(self):
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return tokenizer_all_special_ids
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@property
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def all_special_tokens(self):
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return tokenizer_all_special_tokens
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@property
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def all_special_tokens_extended(self):
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return tokenizer_all_special_tokens_extended
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def __len__(self):
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return tokenizer_len
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CachedTokenizer.__name__ = f"Cached{tokenizer.__class__.__name__}"
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tokenizer.__class__ = CachedTokenizer
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return tokenizer
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def get_tokenizer(
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tokenizer_name: str,
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*args,
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tokenizer_mode: str = "auto",
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trust_remote_code: bool = False,
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revision: Optional[str] = None,
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download_dir: Optional[str] = None,
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**kwargs,
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) -> Union[PreTrainedTokenizer, PreTrainedTokenizerFast]:
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"""Gets a tokenizer for the given model name via HuggingFace or ModelScope.
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"""
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if VLLM_USE_MODELSCOPE:
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# download model from ModelScope hub,
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# lazy import so that modelscope is not required for normal use.
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# pylint: disable=C.
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from modelscope.hub.snapshot_download import snapshot_download
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# Only set the tokenizer here, model will be downloaded on the workers.
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if not os.path.exists(tokenizer_name):
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tokenizer_path = snapshot_download(
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model_id=tokenizer_name,
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cache_dir=download_dir,
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revision=revision,
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# Ignore weights - we only need the tokenizer.
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ignore_file_pattern=["*.pt", "*.safetensors", "*.bin"])
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tokenizer_name = tokenizer_path
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if tokenizer_mode == "slow":
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if kwargs.get("use_fast", False):
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raise ValueError(
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"Cannot use the fast tokenizer in slow tokenizer mode.")
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kwargs["use_fast"] = False
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try:
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tokenizer = AutoTokenizer.from_pretrained(
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tokenizer_name,
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*args,
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trust_remote_code=trust_remote_code,
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revision=revision,
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**kwargs)
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except ValueError as e:
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# If the error pertains to the tokenizer class not existing or not
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# currently being imported, suggest using the --trust-remote-code flag.
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if (not trust_remote_code and
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("does not exist or is not currently imported." in str(e)
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or "requires you to execute the tokenizer file" in str(e))):
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err_msg = (
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"Failed to load the tokenizer. If the tokenizer is a custom "
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"tokenizer not yet available in the HuggingFace transformers "
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"library, consider setting `trust_remote_code=True` in LLM "
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"or using the `--trust-remote-code` flag in the CLI.")
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raise RuntimeError(err_msg) from e
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else:
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raise e
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except AttributeError as e:
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if "BaichuanTokenizer" in str(e):
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# This is for the error "'BaichuanTokenizer' object has no
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# attribute 'sp_model'".
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tokenizer = BaichuanTokenizer.from_pretrained(
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tokenizer_name,
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*args,
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trust_remote_code=trust_remote_code,
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revision=revision,
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**kwargs)
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else:
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raise e
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if not isinstance(tokenizer, PreTrainedTokenizerFast):
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logger.warning(
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"Using a slow tokenizer. This might cause a significant "
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"slowdown. Consider using a fast tokenizer instead.")
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return get_cached_tokenizer(tokenizer)
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def get_lora_tokenizer(lora_request: LoRARequest, *args,
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**kwargs) -> Optional[PreTrainedTokenizer]:
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if lora_request is None:
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return None
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try:
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tokenizer = get_tokenizer(lora_request.lora_local_path, *args,
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**kwargs)
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except OSError as e:
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# No tokenizer was found in the LoRA folder,
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# use base model tokenizer
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logger.warning(
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f"No tokenizer found in {lora_request.lora_local_path}, "
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"using base model tokenizer instead. "
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f"(Exception: {str(e)})")
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tokenizer = None
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return tokenizer
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get_lora_tokenizer_async = make_async(get_lora_tokenizer)
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