change fn output

app.py

@@ -1,7 +1,6 @@
 from transformers import AutoModelForCausalLM, AutoTokenizer
 import torch
 import gradio as gr
-import gradio as gr
 
 
 def chat(message, history):
@@ -15,7 +14,7 @@ def chat(message, history):
     else:
         response = "I don't know"
     history.append((message, response))
-    return history, history
+    return history
 
 chatbot = gr.Chatbot(color_map=("green", "gray"))
 demo = gr.Interface(