adeed missing import

app.py

@@ -13,6 +13,7 @@ from typing import List, Union, Optional
 from transformers import pipeline
 #from transformers import AutoTokenizer, AutoModelForCausalLM
 from langchain.embeddings import HuggingFaceEmbeddings
+from langchain.llms import HuggingFacePipeline
 
 from langchain.schema import Document
 from langchain.chains import LLMChain