Update app.py

app.py

@@ -3,7 +3,7 @@ import hashlib
 import uvicorn
 from fastapi import FastAPI, Request
 from fastapi.responses import JSONResponse
-from langchain_community.llms import VLLM
+from langchain.llms import VLLM
 from gptcache import Cache
 from gptcache.manager.factory import manager_factory
 from gptcache.processor.pre import get_prompt