Update app.py

app.py

@@ -1,11 +1,11 @@
 import gradio as gr
 import os
 
-from langchain.document_loaders import PyPDFLoader
+from langchain_community.document_loaders import PyPDFLoader  # Updated import
 from langchain.text_splitter import RecursiveCharacterTextSplitter
-from langchain.vectorstores import Chroma
-from langchain.embeddings import HuggingFaceEmbeddings 
-from langchain.llms import HuggingFaceHub
+from langchain_community.vectorstores import Chroma  # Updated import
+from langchain_community.embeddings import HuggingFaceEmbeddings  # Updated import
+from langchain_community.llms import HuggingFaceHub  # Updated import
 from langchain.chains import ConversationalRetrievalChain
 from langchain.memory import ConversationBufferMemory