update to langchain_community

app.py

@@ -1,8 +1,8 @@
 import gradio as gr
-from langchain.document_loaders import PyPDFLoader
-from langchain.vectorstores import FAISS
-from langchain.embeddings import HuggingFaceEmbeddings
-from langchain.llms import HuggingFacePipeline
+from langchain_community.document_loaders import PyPDFLoader
+from langchain_community.vectorstores import FAISS
+from langchain_community.embeddings import HuggingFaceEmbeddings
+from langchain_community.llms import HuggingFacePipeline
 from langchain.chains import RetrievalQA
 from transformers import pipeline
 import os

requirements.txt

@@ -4,4 +4,5 @@ langchain
 transformers
 sentence-transformers
 faiss-cpu
-pdfminer.six
+pdfminer.six
+langchain-community