Update app.py

app.py

@@ -5,8 +5,8 @@ import pdfplumber
 from langchain.chains.mapreduce import MapReduceChain
 from langchain.text_splitter import CharacterTextSplitter
 from langchain.chains.summarize import load_summarize_chain
-from langchain.chat_models import ChatOpenAI
-from langchain.document_loaders import UnstructuredFileLoader
+from langchain_community.chat_models import ChatOpenAI
+from langchain_community.document_loaders import UnstructuredFileLoader
 from langchain.prompts import PromptTemplate
 import logging
 import json