Update app.py

app.py

@@ -1,5 +1,3 @@
-pip install -U langchain-community
-
 import gradio as gr
 import pandas as pd
 
@@ -11,7 +9,6 @@ from langchain.document_loaders import TextLoader
 from langchain.chat_models import ChatOpenAI
 from langchain import PromptTemplate
 from langchain.chains import LLMChain
-from langchain.chains.qa_with_sources import load_qa_with_sources_chain
 from langchain.llms import OpenAI
 from langchain.vectorstores import FAISS