def get_zero_center_bbox_tensor(self):
        """Get a tensor of bboxes centered at (0, 0).

        Returns:
            Tensor: Tensor of bboxes with shape (num_bboxes, 4)
            in [xmin, ymin, xmax, ymax] format.
        """
        whs = torch.from_numpy(self.bbox_whs).to(
            self.device, dtype=torch.float32)
        bboxes = bbox_cxcywh_to_xyxy(
            torch.cat([torch.zeros_like(whs), whs], dim=1))
        return bboxes
Get a tensor of bboxes centered at (0, 0).

        Returns:
            Tensor: Tensor of bboxes with shape (num_bboxes, 4)
            in [xmin, ymin, xmax, ymax] format.
        
detection/tools/analysis_tools/optimize_anchors.py