Update app.py

app.py

@@ -1,11 +1,12 @@
 import gradio as gr
 import tempfile
-from langchain.document_loaders import PyPDFLoader
+
+from langchain_community.document_loaders import PyPDFLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
-from langchain.embeddings import HuggingFaceEmbeddings
-from langchain.vectorstores import FAISS
+from langchain_community.embeddings import HuggingFaceEmbeddings
+from langchain_community.vectorstores import FAISS
 from langchain.chains import RetrievalQA
-from langchain.chat_models import ChatOpenAI
+from langchain_openai import ChatOpenAI
 
 def run_qa(pdf_file, question):
     if pdf_file is None or question.strip() == "":