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
 from langchain.text_splitter import RecursiveCharacterTextSplitter
-from langchain.vectorstores import Chroma
+from langchain_community.vectorstores import Chroma
 from langchain.chains import ConversationalRetrievalChain
-from langchain.embeddings import HuggingFaceEmbeddings
-from langchain.llms import HuggingFacePipeline, HuggingFaceHub
+from langchain_community.embeddings import HuggingFaceEmbeddings
+from langchain_community.llms import HuggingFacePipeline, HuggingFaceHub
 from langchain.chains import ConversationChain
 from langchain.memory import ConversationBufferMemory
 from pathlib import Path