[Bug] of DIoU implementation

[phy12321]

Prerequisite

• [X] I have searched Issues and Discussions but cannot get the expected help.
• [X] I have read the FAQ documentation but cannot get the expected help.
• [X] The bug has not been fixed in the latest version (dev-1.x) or latest version (dev-1.0).

Task

I'm using the official example scripts/configs for the officially supported tasks/models/datasets.

Branch

main branch https://github.com/open-mmlab/mmdetection3d

Environment

The definition of DIoU loss:

And the distance between box_pred center and box_gt center in mmdet3d is implemented as follows: link

I think here should be:

    r2 = ((box3d1[..., :3] - box3d2[..., :3])**2).sum(dim=-1)

If I have any misconceptions, please kindly point them out. I would appreciate a detailed response.

Reproduces the problem - code sample

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Reproduces the problem - command or script

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Reproduces the problem - error message

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Additional information

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[sunjiahao1999]

It seems to be a mistake. We will try to re-train the model with the correct loss, thanks for your report!