Update app.py

app.py

@@ -6,6 +6,7 @@
 #from langchain_core.output_parsers import StrOutputParser                            # to transform the output of an LLM into a more usable format
 #from langchain.schema.runnable import RunnableParallel, RunnablePassthrough 
 # importing HuggingFace model abstraction class from langchain
+from langchain_huggingface.llms import HuggingFacePipeline
 from langchain.llms import HuggingFaceEndpoint
 from sentence_transformers import SentenceTransformer