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[Bug] NuScenesDataset class name conflict with CenterHead

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### Prerequisite - [X] I have searched [Issues](https://github.com/open-mmlab/mmdetection3d/issues) and [Discussions](https://github.com/open-mmlab/mmdetection3d/discussions) but cannot get the expected help. - [X] I have read the [FAQ documentation](https://mmdetection3d.readthedocs.io/en/latest/notes/faq.html) but cannot get the expected help....

ae_offset计算相关

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文件：AeDet-main\mmdetection3d\mmdet3d\ops\aeconv\aeconv.py 中 计算方位角偏差 ae_offset = torch.bmm(rot_matrix, conv_offset.transpose(1, 2)).transpose(1, 2) - conv_offset 想问下，最后的 `- conv_offset` 的含义是什么