added gpu declaration

app.py

@@ -98,6 +98,7 @@ def get_colors(num_colors: int) -> List[Tuple[int, int, int]]:
 #     )
 #     return torch.stack([grid_x, grid_y], dim=-1).reshape(1, -1, 2)
 
+@spaces.GPU
 def paint_point_track_gpu_scatter(
         frames: np.ndarray,
         point_tracks: np.ndarray,