Update app.py

app.py

@@ -1,4 +1,5 @@
 import streamlit as st
+import os
 from dotenv import load_dotenv
 from PyPDF2 import PdfReader
 from langchain.text_splitter import CharacterTextSplitter
@@ -70,11 +71,11 @@ def get_conversation_chain(vectorstore,selected_llm):
     elif selected_llm == 'Llama2':
         print('Llama2 LLM')
         model_id = 'meta-llama/Llama-2-7b-chat-hf'
-        hf_auth = hf_auth
+        hf_auth = os.environ.get("HUGGINGFACEHUB_API_TOKEN") 
         
         model_config = transformers.AutoConfig.from_pretrained(
             model_id,
-            token=hf_auth
+            token=os.environ.get("HUGGINGFACEHUB_API_TOKEN")
         )
 
         device = f'cuda:{cuda.current_device()}' if cuda.is_available() else 'cpu'