Update app.py

app.py

@@ -398,10 +398,14 @@ with gr.Blocks(css=MODEL_SELECTION_CSS, theme='gradio/soft') as demo:
     #     _js="(v)=>{ setStorage('local_data',v) }"  
     # )
 
+    def test(history):
+        print(history)
+        return history[:-1]
+    
     regen_event = regenerate.click(
-        lambda history: history[:-1]
-        [chatbot],
-        [chatbot]
+        test,
+        chatbot,
+        chatbot
     ).then(
         rollback_last,
         [idx, local_data, chat_state,