Update app.py

app.py

@@ -16,7 +16,7 @@ with gr.Blocks() as demo:
         fn=init_choices,
         outputs=choices,
     ).then(
-        fn=lambda choices: gr.Dropdown(choices=choices),
+        fn=lambda choices: gr.Dropdown(choices=["a", "b"]),
         inputs=choices,
         outputs=dropdown,
     )