Update app.py

app.py

@@ -2,7 +2,7 @@
 import os
 import gradio as gr
 import streamlit as st
-from transformers import set_env, AutoTokenizer, AutoModelForCausalLM
+from transformers import AutoTokenizer, AutoModelForCausalLM
 from llama_index.core import VectorStoreIndex, SimpleDirectoryReader
 from llama_index.core import ServiceContext
 from llama_index.core import PromptTemplate