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model_support.md

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Model Support

Supported models

How to support a new model

To support a new model in FastChat, you need to correctly handle its prompt template and model loading. The goal is to make the following command run with the correct prompts.

python3 -m fastchat.serve.cli --model [YOUR_MODEL_PATH]

You can run this example command to learn the code logic.

python3 -m fastchat.serve.cli --model lmsys/vicuna-7b-v1.3

You can add --debug to see the actual prompt sent to the model.

Steps

FastChat uses the Conversation class to handle prompt templates and BaseModelAdapter class to handle model loading.

  1. Implement a conversation template for the new model at fastchat/conversation.py. You can follow existing examples and use register_conv_template to add a new one.
  2. Implement a model adapter for the new model at fastchat/model/model_adapter.py. You can follow existing examples and use register_model_adapter to add a new one.
  3. (Optional) add the model name to the "Supported models" section above and add more information in fastchat/model/model_registry.py.

After these steps, the new model should be compatible with most FastChat features, such as CLI, web UI, model worker, and OpenAI-compatible API server. Please do some testing with these features as well.