Update app.py

app.py

@@ -29,8 +29,7 @@ retriever = vectordb.as_retriever(search_kwargs={"k": 5})
 class KwArgsModel(BaseModel):
     kwargs: Dict[str, Any] = Field(default_factory=dict)
 
-class CustomInferenceClient(LLM, KwArgsModel):
-    __metaclass__ = type(LLM)
+class CustomInferenceClient(LLM, KwArgsModel, metaclass=type(LLM)):
     model_name: str
     inference_client: InferenceClient