Update app.py

app.py

@@ -11,6 +11,7 @@
 import openai
 import json
 import gradio as gr
+import os
 from openai import OpenAI
 #from langchain_community.chat_models import ChatOpenAI
 #from langchain_community.chat_models.openai import ChatOpenAI
@@ -18,7 +19,7 @@ from openai import OpenAI
 # rebuild storage context and load knowledge index
 # from llama_index import StorageContext, load_index_from_storage, LLMPredictor, ServiceContext
 from llama_index.core import StorageContext
-from llama_index.core import load_index_from_storage, ServiceContext
+from llama_index.core import load_index_from_storage
 from llama_index.llms.openai import OpenAI
 #from llama_index.core import Settings
 
@@ -28,7 +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_name="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)
@@ -41,7 +42,7 @@ class Chatbot:
         #self.history_file = f"./chat_log.json"
  
     def generate_response(self, user_input):
-        query_engine = index.as_query_engine(llm=llm_predictor)
+        query_engine = index.as_query_engine()
         response = query_engine.query(user_input)
         
         # generate response