Update app.py

app.py

@@ -256,7 +256,7 @@ with gr.Blocks() as demo:
                         run_button = gr.Button('Generate')
 
                 with gr.Row():
-                    target_ratio = gr.Ratio(
+                    target_ratio = gr.Radio(
                         label="Expected Ratio",
                         choices=["9:16", "16:9", "1:1", "Custom"],
                         value="9:16",