Update app.py

app.py

@@ -4,7 +4,6 @@ import gradio as gr
 import requests
 from huggingface_hub import InferenceClient
 from langchain.chains import LLMChain
-from langchain.retrievers import FaissRetriever
 from langchain.prompts import PromptTemplate
 from langchain.wrappers import HuggingFacePipeline
 from langchain.indexing import AsyncChromiumLoader, Html2TextTransformer, CharacterTextSplitter, FAISS, HuggingFaceEmbeddings