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support skip tokenizer chat_template #29895

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piood wants to merge 2 commits into from
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support skip tokenizer chat_template #29895

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5aea6ea
support skip tokenizer chat_template
piood Dec 2, 2025
bd6faf2
fix
piood Dec 2, 2025
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20 changes: 12 additions & 8 deletions vllm/entrypoints/chat_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,9 @@
from vllm.multimodal.utils import MEDIA_CONNECTOR_REGISTRY, MediaConnector
from vllm.tokenizers import MistralTokenizer, TokenizerLike
from vllm.transformers_utils.chat_templates import get_chat_template_fallback_path
from vllm.transformers_utils.chat_templates.registry import (
_SKIP_TOKENIZER_CHAT_TEMPLATE,
)
from vllm.transformers_utils.processor import cached_get_processor
from vllm.utils import random_uuid
from vllm.utils.func_utils import supports_kw
Expand Down Expand Up @@ -504,14 +507,15 @@ def resolve_hf_chat_template(
return chat_template

# 3rd priority: AutoTokenizer chat template
try:
return tokenizer.get_chat_template(chat_template, tools=tools)
except Exception:
logger.debug(
"Failed to load AutoTokenizer chat template for %s",
tokenizer.name_or_path,
exc_info=True,
)
if model_config.hf_config.model_type not in _SKIP_TOKENIZER_CHAT_TEMPLATE:
try:
return tokenizer.get_chat_template(chat_template, tools=tools)
except Exception:
logger.debug(
"Failed to load AutoTokenizer chat template for %s",
tokenizer.name_or_path,
exc_info=True,
)

# 4th priority: Predefined fallbacks
path = get_chat_template_fallback_path(
Expand Down
3 changes: 3 additions & 0 deletions vllm/transformers_utils/chat_templates/registry.py
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,9 @@ def _get_minicpmv_chat_template_fallback(tokenizer_name_or_path: str) -> Path |
"siglip2": CHAT_TEMPLATES_DIR / "template_basic.jinja",
}

# These model types skip tokenizer chat template and use fallback directly
_SKIP_TOKENIZER_CHAT_TEMPLATE: set[str] = {"siglip", "siglip2"}


def register_chat_template_fallback_path(
model_type: str,
Expand Down