Add support for baichuan2 models (lm-sys#2408)

fastchat/conversation.py

@@ -804,6 +804,20 @@ def get_conv_template(name: str) -> Conversation:
     )
 )
 
+# Baichuan2-13B-Chat template
+register_conv_template(
+    # source: https://huggingface.co/baichuan-inc/Baichuan2-13B-Chat/blob/c6f8592a60b4ad73c210b28dd2ab3cca51abbf93/modeling_baichuan.py#L773
+    # https://huggingface.co/baichuan-inc/Baichuan2-13B-Chat/blob/main/generation_config.json
+    # https://github.com/baichuan-inc/Baichuan2/issues/62
+    Conversation(
+        name="baichuan2-chat",
+        roles=("<reserved_106>", "<reserved_107>"),
+        sep_style=SeparatorStyle.NO_COLON_SINGLE,
+        sep="",
+        stop_token_ids=[],
+    )
+)
+
 # llama2 template
 # reference: https://huggingface.co/blog/codellama#conversational-instructions
 # reference: https://github.com/facebookresearch/llama/blob/1a240688810f8036049e8da36b073f63d2ac552c/llama/generation.py#L212

fastchat/model/model_adapter.py

@@ -1172,6 +1172,8 @@ def load_model(self, model_path: str, from_pretrained_kwargs: dict):
     def get_default_conv_template(self, model_path: str) -> Conversation:
         # for Baichuan-13B-Chat
         if "chat" in model_path.lower():
+            if "baichuan2" in model_path.lower():
+                return get_conv_template("baichuan2-chat")
             return get_conv_template("baichuan-chat")
         return get_conv_template("zero_shot")