init

transformers_utils/chat_templates/__init__.py

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+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+from .registry import get_chat_template_fallback_path
+
+__all__ = ["get_chat_template_fallback_path"]

transformers_utils/chat_templates/registry.py

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+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+from pathlib import Path
+from typing import Callable, Optional, Union
+
+from vllm.logger import init_logger
+
+logger = init_logger(__file__)
+
+CHAT_TEMPLATES_DIR = Path(__file__).parent
+
+ChatTemplatePath = Union[Path, Callable[[str], Optional[Path]]]
+
+
+def _get_qwen_chat_template_fallback(
+        tokenizer_name_or_path: str) -> Optional[Path]:
+    if tokenizer_name_or_path.endswith("-Chat"):
+        return CHAT_TEMPLATES_DIR / "template_chatml.jinja"
+
+    return CHAT_TEMPLATES_DIR / "template_basic.jinja"
+
+
+# yapf: disable
+_MODEL_TYPE_TO_CHAT_TEMPLATE_FALLBACK: dict[str, ChatTemplatePath] = {
+    "blip-2": CHAT_TEMPLATES_DIR / "template_blip2.jinja",
+    "chameleon": CHAT_TEMPLATES_DIR / "template_basic.jinja",
+    "deepseek_vl_v2": CHAT_TEMPLATES_DIR / "template_deepseek_vl2.jinja",
+    "florence2": CHAT_TEMPLATES_DIR / "template_basic.jinja",
+    "fuyu": CHAT_TEMPLATES_DIR / "template_fuyu.jinja",
+    "paligemma": CHAT_TEMPLATES_DIR / "template_basic.jinja",
+    "qwen": _get_qwen_chat_template_fallback,
+}
+# yapf: enable
+
+
+def register_chat_template_fallback_path(
+    model_type: str,
+    chat_template: ChatTemplatePath,
+) -> None:
+    if model_type in _MODEL_TYPE_TO_CHAT_TEMPLATE_FALLBACK:
+        logger.warning(
+            "Model type %s already has a chat template registered. "
+            "It will be overwritten by the new chat template %s.", model_type,
+            chat_template)
+
+    _MODEL_TYPE_TO_CHAT_TEMPLATE_FALLBACK[model_type] = chat_template
+
+
+def get_chat_template_fallback_path(
+    model_type: str,
+    tokenizer_name_or_path: str,
+) -> Optional[Path]:
+    chat_template = _MODEL_TYPE_TO_CHAT_TEMPLATE_FALLBACK.get(model_type)
+    if callable(chat_template):
+        chat_template = chat_template(tokenizer_name_or_path)
+
+    if chat_template is None:
+        return None
+
+    return chat_template

transformers_utils/chat_templates/template_basic.jinja

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+{%- for message in messages -%}
+    {{- message['content'] -}}
+{%- endfor -%}

transformers_utils/chat_templates/template_blip2.jinja

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+{%- for message in messages -%}
+    {%- if message['role'] == 'user' -%}
+        {{- 'Question: ' + message['content'] + ' ' -}}
+    {%- elif message['role'] == 'assistant' -%}
+        {{- 'Answer: ' + message['content'] + ' ' -}}
+    {%- endif -%}
+{%- endfor -%}
+
+{%- if add_generation_prompt -%}
+    {{- 'Answer:' -}}
+{% endif %}

transformers_utils/chat_templates/template_chatml.jinja

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+{%- for message in messages -%}
+    {{- '<|im_start|>' + message['role'] + '\n' + message['content'] -}}
+    {%- if (loop.last and add_generation_prompt) or not loop.last -%}
+        {{- '<|im_end|>' + '\n' -}}
+    {%- endif -%}
+{%- endfor -%}
+
+{%- if add_generation_prompt and messages[-1]['role'] != 'assistant' -%}
+    {{- '<|im_start|>assistant\n' -}}
+{%- endif -%}

transformers_utils/chat_templates/template_deepseek_vl2.jinja

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+{%- if messages[0]['role'] == 'system' -%}
+    {%- set system_message = messages[0]['content'] -%}
+    {%- set messages = messages[1:] -%}
+{%- else -%}
+    {% set system_message = '' -%}
+{%- endif -%}
+
+{{ bos_token + system_message }}
+{%- for message in messages -%}
+    {%- if (message['role'] == 'user') != (loop.index0 % 2 == 0) -%}
+        {{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}
+    {%- endif -%}
+
+    {%- if message['role'] == 'user' -%}
+        {{ '<|User|>: ' + message['content'] + '\n\n' }}
+    {%- elif message['role'] == 'assistant' -%}
+        {{ '<|Assistant|>: ' + message['content'] + eos_token + '\n\n' }}
+    {%- endif -%}
+{%- endfor -%}
+
+{%- if add_generation_prompt -%}
+    {{ '<|Assistant|>: ' }}
+{%- endif -%}

transformers_utils/chat_templates/template_fuyu.jinja

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+{%- for message in messages -%}
+    {{- message['content'] + '\n' -}}
+{%- endfor -%}