Fixed parameter incorrect (openai#1378)

The parameter in registry is `chat_model_kwargs`


https://github.com/openai/evals/blob/dd96814dd96bd64f3098afca8dc873aa8d8ce4c8/evals/registry/completion_fns/langchain_llms.yaml#L22-L27

evals/completion_fns/langchain_llm.py

@@ -66,16 +66,16 @@ def _convert_dict_to_langchain_message(_dict) -> BaseMessage:
 
 
 class LangChainChatModelCompletionFn(CompletionFn):
- def __init__(self, llm: str, llm_kwargs: Optional[dict] = None, **kwargs) -> None:
+ def __init__(self, llm: str, chat_model_kwargs: Optional[dict] = None, **kwargs) -> None:
  # Import and resolve self.llm to an instance of llm argument here,
  # assuming it's always a subclass of BaseLLM
- if llm_kwargs is None:
- llm_kwargs = {}
+ if chat_model_kwargs is None:
+ chat_model_kwargs = {}
  module = importlib.import_module("langchain.chat_models")
  LLMClass = getattr(module, llm)
 
  if issubclass(LLMClass, BaseChatModel):
- self.llm = LLMClass(**llm_kwargs)
+ self.llm = LLMClass(**chat_model_kwargs)
  else:
  raise ValueError(f"{llm} is not a subclass of BaseChatModel")