Update app.py

app.py

@@ -110,7 +110,7 @@ def submit_message(prompt, prompt_template, temperature, max_tokens, context_len
         #completion = completion.run(query)
         # from https://blog.devgenius.io/chat-with-document-s-using-openai-chatgpt-api-and-text-embedding-6a0ce3dc8bc8
 
-        completion = VectorDBQA.from_chain_type(llm=ChatOpenAI(temperature=temperature, max_tokens=max_tokens, model_name="gpt-3.5-turbo"), chain_type="stuff", vectorstore=vectordb, return_source_documents=True)
+        completion = RetrievalQA.from_chain_type(llm=ChatOpenAI(temperature=temperature, max_tokens=max_tokens, model_name="gpt-3.5-turbo"), chain_type="stuff", vectorstore=vectordb, return_source_documents=True)
         query = str(system_prompt + history[-context_length*2:] +  [prompt_msg])
         completion = completion({"query": query})
 #        completion = completion({"question": query, "chat_history": history[-context_length*2:]})