Update app.py

app.py

@@ -1,5 +1,5 @@
 # 4/28/2024
-# Not working on huggingface :(
+
 # This version added saving chat history to a log file
 # Updated the GPT model to gpt-4
 # Add timestamp and ip address
@@ -29,7 +29,7 @@ import socket;
 # deprecated
 storage_context = StorageContext.from_defaults(persist_dir='./')
 # gpt-3.5_turbo is the current default model
-#llm_predictor = OpenAI(temperature=0.5, model_name="gpt-4")
+llm_predictor = OpenAI(temperature=0.5, model="gpt-4")
 #service_context = ServiceContext.from_defaults(llm=llm_predictor)
 #index = load_index_from_storage(storage_context, service_context=service_context)
 index = load_index_from_storage(storage_context)
@@ -42,7 +42,7 @@ class Chatbot:
         #self.history_file = f"./chat_log.json"
  
     def generate_response(self, user_input):
-        query_engine = index.as_query_engine()
+        query_engine = index.as_query_engine(llm=llm_predictor)
         response = query_engine.query(user_input)
         
         # generate response