Update app.py

app.py

@@ -1,15 +1,15 @@
 import gradio as gr
 import os
 
-from langchain.document_loaders import PyPDFLoader
-from langchain.text_splitter import RecursiveCharacterTextSplitter
-from langchain.vectorstores import Chroma
-from langchain.chains import ConversationalRetrievalChain
-from langchain.embeddings import HuggingFaceEmbeddings 
-from langchain.llms import HuggingFacePipeline
-from langchain.chains import ConversationChain
-from langchain.memory import ConversationBufferMemory
-from langchain.llms import HuggingFaceHub
+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_community.llms import HuggingFaceHub
 
 from pathlib import Path
 import chromadb