code: def update_boxes(self, box_pos, box_size):
          
          assert box_pos.shape == (self.n_boxes, 2)
          assert len(box_size) == 2
          self.box_bounds = _get_boxes(box_pos,
                                       size=box_size,
                                       keep_aspect_ratio=self.keep_aspect_ratio,
                                       )
docs: Set the box bounds from specified box positions and sizes.