Update app.py

app.py

@@ -59,14 +59,14 @@ retriever = vectordb.as_retriever(
 #from langchain.chains import RetrievalQA
 from langchain_core.prompts import ChatPromptTemplate
 
-from langchain import create_retrieval_chain
+from langchain.chains import create_retrieval_chain
 from langchain.chains.combine_documents import create_stuff_documents_chain
 #from langchain import hub
 
 
-#READER_MODEL=HuggingFaceH4/zephyr-7b-beta
+READER_MODEL="HuggingFaceH4/zephyr-7b-beta"
 #HuggingFaceH4/zephyr-7b-beta
-READER_MODEL=Ollama(model="meta-llama/Meta-Llama-Guard-2-8B")
+#READER_MODEL=Ollama(model="meta-llama/Meta-Llama-Guard-2-8B")
 #qa = ConversationalRetrievalChain.from_llm(llm=READER_MODEL,retriever=retriever,memory=memory)
 #qa = RetrievalQA.from_chain_type(llm=READER_MODEL,chain_type="map_reduce",retriever=retriever,verbose=True)