Update app.py

app.py

@@ -55,7 +55,7 @@ qa_chain = ConversationalRetrievalChain.from_llm(
     llm=llm,
     retriever=vectordb.as_retriever(search_kwargs={"k": 3}),
     memory=memory,
-    chain_type="map_reduce",
+    chain_type="stuff",
     combine_docs_chain_kwargs={"prompt": prompt}
 )