8000 Better chat format for Qwen2.5-VL by alcoftTAO · Pull Request #2040 · abetlen/llama-cpp-python · GitHub 8000
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Better chat format for Qwen2.5-VL #2040

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abetlen merged 1 commit into from
Jul 15, 2025
Merged

Better chat format for Qwen2.5-VL #2040

abetlen merged 1 commit into from
Jul 15, 2025

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@alcoftTAO
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@alcoftTAO alcoftTAO commented Jul 8, 2025 
CHAT_FORMAT = (
    "<|im_start|>system\n"
    "You are a helpful assistant.<|im_end|>\n"
    "{% for message in messages %}"
    "{% if message['role'] == 'user' %}"
    "<|im_start|>user\n"
    "{% if message['content'] is string %}"
    "{{ message['content'] }}"
    "{% else %}"
    "{% for content in message['content'] %}"
    "{% if content['type'] == 'text' %}"
    "{{ content['text'] }}"
    "{% elif content['type'] == 'image_url' %}"
    "{% if content.image_url is string %}"
    "{{ content.image_url }}"
    "{% else %}"
    "{{ content.image_url.url }}"
    "{% endif %}"
    "{% endif %}"
    "{% endfor %}"
    "{% endif %}"
    "<|im_end|>\n"
    "{% endif %}"
    "{% endfor %}"
    "<|im_start|>assistant\n"
)

This is the current chat format for Qwen2.5-VL, it works but sometimes the model prints a 'random' first token. Example: : In this image, I see...

This new chat format fixes it and also adds custom system messages for the model.

@abetlen abetlen merged commit c8579d7 into abetlen:main Jul 15, 2025
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@alcoftTAO @abetlen
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