Update app.py

app.py

@@ -12,7 +12,7 @@ from langchain.chains.llm import LLMChain
 from langchain.chains.combine_documents.stuff import StuffDocumentsChain
 from langchain.chains import RetrievalQA
 from langchain.text_splitter import RecursiveCharacterTextSplitter
-from langchain_community.chat_models import ChatOpenAI
+from langchain_openai import ChatOpenAI
 from langchain_community.vectorstores import FAISS
 from langchain_community.document_loaders import HuggingFaceDatasetLoader
 from langchain_community.embeddings import HuggingFaceEmbeddings