changed app.py to manage str or list error

app.py

@@ -1,19 +1,17 @@
-from transformers import pipeline, Conversation
+from transformers import pipeline
 import gradio as gr
 
 chatbot = pipeline(model="facebook/blenderbot-400M-distill")
 
-message_list = []
-response_list = []
-
 def vanilla_chatbot(message, history):
-    conversation = Conversation(text=message, past_user_inputs=message_list, generated_responses=response_list)
-    conversation = chatbot(conversation)
-
-    return conversation.generated_responses[-1]
+    # Combine the history and the new message
+    full_message = "\n".join([f"{h[0]}\n{h[1]}" for h in history] + [message])
+    
+    # Generate a response using the chatbot
+    response = chatbot(full_message, max_length=1000, do_sample=True, top_p=0.95, top_k=50)[0]['generated_text']
+    
+    return response
 
 demo_chatbot = gr.ChatInterface(vanilla_chatbot, title="Vanilla Chatbot", description="Enter text to start chatting.")
 
-demo_chatbot.launch()
-
-# change to trigger rebuild after push
+demo_chatbot.launch()