fix: model test

app.py

@@ -913,7 +913,7 @@ class ConversationBot:
             raise ValueError(
                 "You have to load ImageCaptioning as a basic function for VisualChatGPT")
 
-        self.llm = OpenAIChat(temperature=0)
+        self.llm = OpenAI(temperature=0)
         self.memory = ConversationBufferMemory(
             memory_key="chat_history", output_key='output')