TypeError: list indices must be integers or slices, not tuple 错误原因解决方法

运行下列代码时报错TypeError: list indices must be integers or slices, not tuple

segmented_objects[:, :, 3:6] -= np.expand_dims(mean_rgb, 0)
1

原因: [:, :, 3:6]操作对torch.tensor合法, 对list非法. segmented_objects应当是一个torch.tensor.