@staticmethod
def iou3d_loss(x, y):
    iou3d = boxes_iou3d_gpu_differentiable(x, y)
    return (1 - iou3d)
@staticmethod
def iou3d_loss(x, y):
    iou3d = boxes_iou3d_gpu_differentiable(x, y)
    return (1 - iou3d)