Add Yi support (#2723)

fastchat/conversation.py

@@ -1021,6 +1021,23 @@ def get_conv_template(name: str) -> Conversation:
     )
 )
 
+# source: https://huggingface.co/01-ai/Yi-34B-Chat/blob/main/tokenizer_config.json#L60
+register_conv_template(
+    Conversation(
+        name="Yi-34b-chat",
+        roles=("<|im_start|>user", "<|im_start|>assistant"),
+        sep_style=SeparatorStyle.CHATML,
+        sep="<|im_end|>",
+        stop_token_ids=[
+            2,
+            6,
+            7,
+            8,
+        ],  # "<|endoftext|>", "<|im_start|>", "<|im_end|>", "<|im_sep|>"
+        stop_str="<|endoftext|>",
+    )
+)
+
 
 # AquilaChat default template
 # source: https://github.com/FlagAI-Open/FlagAI/blob/master/examples/Aquila/Aquila-chat/cyg_conversation.py

fastchat/model/model_adapter.py

@@ -1885,6 +1885,16 @@ def get_default_conv_template(self, model_path: str) -> Conversation:
         return get_conv_template("orca-2")
 
 
+class YiAdapter(BaseModelAdapter):
+    """The model adapter for Yi models"""
+
+    def match(self, model_path: str):
+        return "yi-34b-chat" in model_path.lower()
+
+    def get_default_conv_template(self, model_path: str) -> Conversation:
+        return get_conv_template("Yi-34b-chat")
+
+
 # Note: the registration order matters.
 # The one registered earlier has a higher matching priority.
 register_model_adapter(PeftModelAdapter)
@@ -1954,6 +1964,7 @@ def get_default_conv_template(self, model_path: str) -> Conversation:
 register_model_adapter(LemurAdapter)
 register_model_adapter(PygmalionAdapter)
 register_model_adapter(MicrosoftOrcaAdapter)
+register_model_adapter(YiAdapter)
 
 # After all adapters, try the default base adapter.
 register_model_adapter(BaseModelAdapter)

fastchat/model/model_registry.py

@@ -397,3 +397,10 @@ def get_model_info(name: str) -> ModelInfo:
     "https://huggingface.co/BAAI/AquilaChat2-34B",
     "Chat models developed by BAAI team",
 )
+
+register_model_info(
+    ["Yi-34B-Chat"],
+    "Yi-Chat",
+    "https://huggingface.co/01-ai",
+    "A large language model by 01.AI.",
+)

fastchat/serve/vllm_worker.py

@@ -101,6 +101,7 @@ async def generate_stream(self, params):
             top_p=top_p,
             use_beam_search=use_beam_search,
             stop=list(stop),
+            stop_token_ids=stop_token_ids,
             max_tokens=max_new_tokens,
             top_k=top_k,
             presence_penalty=presence_penalty,