Update app.py

app.py

@@ -7,9 +7,9 @@ from PyPDF2 import PdfReader
 from langchain.text_splitter import CharacterTextSplitter, RecursiveCharacterTextSplitter
 from langchain.embeddings.openai import OpenAIEmbeddings
 from langchain import VectorDBQA
-from langchain.llms import ChatOpenAI
+# from langchain.llms import ChatOpenAI
 from langchain.chains import RetrievalQA
-from langchain.chat_models import AzureChatOpenAI
+from langchain.chat_models import ChatOpenAI
 
 # from langchain.chat_models import AzureChatOpenAI