Update app.py

app.py

@@ -2,13 +2,13 @@ import gradio as gr
 import os
 
 from langchain_community.document_loaders import PyPDFLoader
-from langchain_community.text_splitter import RecursiveCharacterTextSplitter
 from langchain_community.vectorstores import Chroma
-from langchain_community.chains import ConversationalRetrievalChain
 from langchain_community.embeddings import HuggingFaceEmbeddings 
 from langchain_community.llms import HuggingFacePipeline
-from langchain_community.chains import ConversationChain
-from langchain_community.memory import ConversationBufferMemory
+from langchain.text_splitter import RecursiveCharacterTextSplitter
+from langchain.chains import ConversationalRetrievalChain
+from langchain.chains import ConversationChain
+from langchain.memory import ConversationBufferMemory
 from langchain_community.llms import HuggingFaceHub
 
 from pathlib import Path