Files
sglang/python/sglang/srt/utils/patch_tokenizer.py
T

117 lines
3.9 KiB
Python

import logging
from sglang.srt.environ import envs
logger = logging.getLogger(__name__)
def patch_tokenizer(tokenizer):
if not envs.SGLANG_PATCH_TOKENIZER.get():
return tokenizer
if _is_kimi_tiktoken_tokenizer(tokenizer):
logger.info(
f"Applying special tokens cache patch for Kimi tokenizer: {type(tokenizer)}"
)
return _SpecialTokensCachePatcher.patch(tokenizer)
return tokenizer
def unpatch_tokenizer(tokenizer):
return _SpecialTokensCachePatcher.unpatch(tokenizer)
def _is_kimi_tiktoken_tokenizer(tokenizer):
cls = type(tokenizer)
class_name = cls.__name__
module_name = cls.__module__ or ""
return class_name == "TikTokenTokenizer" and "tokenization_kimi" in module_name
class _SpecialTokensCachePatcher:
_PATCHED_FLAG = "_sglang_special_tokens_patched"
_CACHED_TOKENS_ATTR = "_sglang_cached_special_tokens"
_CACHED_IDS_ATTR = "_sglang_cached_special_ids"
@classmethod
def patch(cls, tokenizer):
tokenizer_cls = type(tokenizer)
if getattr(tokenizer_cls, cls._PATCHED_FLAG, False):
return tokenizer
tokenizer_cls._original_all_special_tokens = (
tokenizer_cls.all_special_tokens.fget
)
tokenizer_cls._original_all_special_ids = tokenizer_cls.all_special_ids.fget
tokenizer_cls._original_add_special_tokens = tokenizer_cls.add_special_tokens
tokenizer_cls._original_add_tokens = tokenizer_cls.add_tokens
patched_all_special_tokens = _make_cached_property(
cls._CACHED_TOKENS_ATTR, tokenizer_cls._original_all_special_tokens
)
patched_all_special_ids = _make_cached_property(
cls._CACHED_IDS_ATTR, tokenizer_cls._original_all_special_ids
)
def patched_add_special_tokens(self, *args, **kwargs):
assert (
False
), "Cannot modify special tokens after patch. Call unpatch_tokenizer first."
def patched_add_tokens(self, new_tokens, special_tokens=False):
assert (
not special_tokens
), "Cannot add special tokens after patch. Call unpatch_tokenizer first."
return tokenizer_cls._original_add_tokens(
self, new_tokens, special_tokens=False
)
tokenizer_cls.all_special_tokens = patched_all_special_tokens
tokenizer_cls.all_special_ids = patched_all_special_ids
tokenizer_cls.add_special_tokens = patched_add_special_tokens
tokenizer_cls.add_tokens = patched_add_tokens
setattr(tokenizer_cls, cls._PATCHED_FLAG, True)
return tokenizer
@classmethod
def unpatch(cls, tokenizer):
tokenizer_cls = type(tokenizer)
if not getattr(tokenizer_cls, cls._PATCHED_FLAG, False):
return tokenizer
tokenizer_cls.all_special_tokens = property(
tokenizer_cls._original_all_special_tokens
)
tokenizer_cls.all_special_ids = property(
tokenizer_cls._original_all_special_ids
)
tokenizer_cls.add_special_tokens = tokenizer_cls._original_add_special_tokens
tokenizer_cls.add_tokens = tokenizer_cls._original_add_tokens
del tokenizer_cls._original_all_special_tokens
del tokenizer_cls._original_all_special_ids
del tokenizer_cls._original_add_special_tokens
del tokenizer_cls._original_add_tokens
delattr(tokenizer_cls, cls._PATCHED_FLAG)
for attr in [cls._CACHED_TOKENS_ATTR, cls._CACHED_IDS_ATTR]:
if hasattr(tokenizer, attr):
delattr(tokenizer, attr)
logger.info(f"Unpatched special tokens cache for {tokenizer_cls.__name__}")
return tokenizer
def _make_cached_property(cache_attr, original_fn):
@property
def cached_prop(self):
if getattr(self, cache_attr, None) is None:
setattr(self, cache_attr, original_fn(self))
return getattr(self, cache_attr)
return cached_prop