fix

examples/gradio_test.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+# -*- coding:utf-8 -*-
+
+import gradio as gr
+
+def change_tab():
+    return gr.Tabs.update(selected=1)
+
+with gr.Blocks() as demo:
+    with gr.Tabs() as tabs:
+        with gr.TabItem("Train", id=0):
+            t = gr.Textbox()
+        with gr.TabItem("Inference", id=1):
+            i = gr.Image()
+    
+    btn = gr.Button()
+    btn.click(change_tab, None, tabs)
+
+demo.launch()