App udated again.

app.py

@@ -1,4 +1,8 @@
 import gradio as gr
+from transformers import pipeline, Conversation
+
+message_list = []
+response_list = []
 
 def vanilla_chatbot(message, history):
     conversation = Conversation(text = message, past_user_inputs=message_list, generated_responses=response_list)