lzh420202

[Bug] Rotated IoU get a wrong value (box_iou_rotated)

3

### Prerequisite - [X] I have searched [Issues](https://github.com/open-mmlab/mmcv/issues) and [Discussions](https://github.com/open-mmlab/mmcv/discussions) but cannot get the expected help. - [X] The bug has not been fixed in the latest version(https://github.com/open-mmlab/mmcv). ### Environment...