add eiou impl

[Wwupup]

Motivation

In paper: A Systematic IoU-Related Method: Beyond Simplified Regression for Better Localization of TIP2021, we propose a new Extended-IOU loss, which outperforms the commonly used GIOU and DIOU in object detection.

Modification

add implementation of the proposed Extended-IOU Loss (EIOU).

Use cases (Optional)

In config:
loss_bbox=dict(type='EIoULoss', loss_weight=1.0, smooth_point=0.1)

[ZwwWayne]

Hi @Wwupup ,
Thanks for your kind PR. Could you also help to add unit tests?

[Wwupup]

Hi @Wwupup , Thanks for your kind PR. Could you also help to add unit tests?

Hi, I have made modifications to tests/test_models/test_losses/test_loss.py in my PR, do I need to make any other changes?

[RangiLyu]

Hi @Wwupup , Thanks for your kind PR. Could you also help to add unit tests?

Hi, I have made modifications to tests/test_models/test_losses/test_loss.py in my PR, do I need to make any other changes?

I think that's enough.

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