Update app.py

app.py

@@ -131,7 +131,7 @@ class Chatbot:
         knowledge_base = state["knowledge_base"]
         retriever = knowledge_base.as_retriever()
         qa = ConversationalRetrievalChain.from_llm(
-            llm=OpenAI(temperature=0.5),
+            llm=OpenAI(temperature=0),
             retriever=retriever,
             memory=ConversationBufferMemory(memory_key="chat_history",return_messages=True),
             return_source_documents=False)