Update app.py

app.py

@@ -1,16 +1,16 @@
 import gradio as gr
 
-from langchain.document_loaders import OnlinePDFLoader
+from langchain_community.document_loaders import OnlinePDFLoader
 
-from langchain.text_splitter import CharacterTextSplitter
+from langchain_community.text_splitter import CharacterTextSplitter
 
-from langchain.llms import HuggingFaceHub
+from langchain_community.llms import HuggingFaceHub
 
-from langchain.embeddings import HuggingFaceHubEmbeddings
+from langchain_community.embeddings import HuggingFaceHubEmbeddings
 
-from langchain.vectorstores import Chroma
+from langchain_community.vectorstores import Chroma
 
-from langchain.chains import RetrievalQA
+from langchain_community.chains import RetrievalQA