Update app.py

app.py

@@ -4,6 +4,7 @@ from langchain_core.prompts import PromptTemplate
 from langchain_community.llms.huggingface_pipeline import HuggingFacePipeline
 from transformers import AutoModelForCausalLM, AutoTokenizer, pipeline,BitsAndBytesConfig
 import os
+from langchain_community.llms import HuggingFaceEndpoint
 aa=''
 
 HF_TOKEN = os.environ["HF_TOKEN"]