Update app.py

app.py

@@ -18,7 +18,9 @@ from langchain_classic.chains.conversational_retrieval.base import (
         ConversationalRetrievalChain,
     )
 from htmlTemplates import css, bot_template, user_template
-from langchain.llms import HuggingFaceHub
+#from langchain.llms import HuggingFaceHub
+# update according to this: https://docs.langchain.com/oss/python/integrations/llms/huggingface_endpoint
+from langchain_huggingface import HuggingFaceEndpoint
 
 
 def get_pdf_text(pdf_docs):