add loading indicators

app.py

@@ -100,8 +100,10 @@ input_widgets = pn.Column(
 
 # add interactivity
 randomize_url.on_click(set_random_url)
-interactive_result = pn.bind(
-    process_inputs, image_url=image_url, class_names=class_names
+interactive_result = pn.panel(
+        pn.bind(
+        process_inputs, image_url=image_url, class_names=class_names
+    ), loading_indicator=True
 )
 
 # create dashboard