docs: little update

app.py

@@ -263,12 +263,14 @@ def on_example_click(
     # Sequentially build the canvas (We don't accept the empty traj_lists & traj_instance_idx returned by build_canvas)
     print("Build Canvas by Example!")
     visual_canvas, initial_visual_canvas, inference_canvas, _, _ = build_canvas(input_image, resized_height, resized_width, top_left_height, top_left_width, bottom_right_height, bottom_right_width)
+    print("Init visual_canvas shape is", visual_canvas.shape)
 
 
     # Sequentially load the Trajs of all instances on the canvas
     print("Build Traj by Example!")
     visual_canvas, traj_instance_idx = fn_vis_all_instance_traj(visual_canvas, traj_lists)
-
+    print("Drawn visual_canvas shape is", visual_canvas.shape)
+    
 
     return visual_canvas, initial_visual_canvas, inference_canvas, traj_instance_idx