Add support for baichuan

[codethazine]

Closes #303

Should be merged after #364 - as the model requires its remote tokenizer to run correctly

[gesanqiu]

Thanks, but I think still need to add a conversation template in FastChat since /v1/chat/completion API requires it. Or can you give a prompt template for /v1/completions, I can't wait to try this model.

[codethazine]

This is a good prompt template I came up with for the completions:

curl http://localhost:8000/v1/completions \
    -d '{
    "model": "baichuan-inc/baichuan-7b",
        "prompt": "A chat between a curious user and an artificial intelligence assistant. \n### USER: Hello!\n### ASSISTANT:",
        "stop": "\n",
        "max_tokens": 42
    }'

[lucasjinreal]

Any updates on this?

I saw there a some PRs try support baichuan now, please consider merge one otherwise none of them can be properly supported

[zhuohan123]

Thank you for your excellent contribution! This PR looks good to me. Sorry that we have been busy in the past several weeks so we didn't get a chance to review this. I just tested this out and it works great!