Update app.py

app.py

@@ -134,9 +134,7 @@ def initialize_llmchain(temperature, max_tokens, top_k, vector_db, progress=gr.P
     memory = ConversationBufferWindowMemory(memory_key = 'chat_history', k=3,output_key='answer',return_messages=True)
     retriever=vector_db.as_retriever()
     progress(0.8, desc="Defining retrieval chain...")
-    # qa_chain = ConversationalRetrievalChain.from_llm(llm,retriever=retriever,chain_type="stuff", 
-    #                                                  memory=memory,return_source_documents=True,verbose=False)
-    qa_chain = ConversationalRetrievalChain.from_llm(llm,retriever=retriever,chain_type="refine", 
+    qa_chain = ConversationalRetrievalChain.from_llm(llm,retriever=retriever,chain_type="stuff", 
                                                      memory=memory,return_source_documents=True,verbose=False)
     progress(0.9, desc="Done!")
     return qa_chain