Retinaface reimplementation

[warrentdrew]

Add more support to widerface face detection and a widely used face detector retinaface.

main modifications include:

1. add retinaface detection head
2. add SSH contenxt module used as a neck in retinaface
3. add RandomSquareCrop to dataset transforms, which is a commonly used augmentation in face detection
4. modifications on PhotoMetricDistortion, to add a saturate function providing the choice to limit the pixel range within 0 to 255, which seems to be key to the accuracy on widerface
5. add a retinaface baseline config

[CLAassistant]

All committers have signed the CLA.

[hhaAndroid]

@warrentdrew Thank you very much for your contribution, we will review it immediately.

[codecov[bot]]

Codecov Report

Merging #7206 (178b9fd) into dev (178b9fd) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 178b9fd differs from pull request most recent head 0ea9665. Consider uploading reports for the commit 0ea9665 to get more accurate results

@@           Coverage Diff           @@
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  Coverage   64.67%   64.67%           
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  Files         351      351           
  Lines       28461    28461           
  Branches     4807     4807           
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  Hits        18408    18408           
  Misses       9066     9066           
  Partials      987      987           

Flag	Coverage Δ
unittests	64.67% <0.00%> (ø)

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[jbwang1997]

Thanks for your contributions. Please refer to https://github.com/open-mmlab/mmcv/blob/master/CONTRIBUTING.md to install pre-commit and fix the lint error.

[hhaAndroid]

@warrentdrew Do you have any progress?

[warrentdrew]

@warrentdrew Do you have any progress?

hi, I have made changes to use wider_face.py in base and fix the init_cfg. For the RandomSquareCrop, I think it's closest to the available MinIoURandomCrop, while changes are still necessary since we want keep all the crop square. I will later try to fix lint errors btw.

[jbwang1997]

Hello @warrentdrew. There are also some conflicts and lint errors in this repo that need to solve. Do you have any progress?

[warrentdrew]

Hello @warrentdrew. There are also some conflicts and lint errors in this repo that need to solve. Do you have any progress?

Hi @jbwang1997, thanks for the information. I have now merged the latest code and redo all the commits using the pre-commit tool and fixed the lint errors.

[warrentdrew]

Hi @jbwang1997 , Thanks for your comments. I have now reformat the code and merged the new changes and resolved conflicts from master.

[OpenMMLab-Assistant003]

Hi @warrentdrew！We are grateful for your efforts in helping improve this open-source project during your personal time. Welcome to join OpenMMLab Special Interest Group (SIG) private channel on Discord, where you can share your experiences, ideas, and build connections with like-minded peers. To join the SIG channel, simply message moderator— OpenMMLab on Discord or briefly share your open-source contributions in the #introductions channel and we will assist you. Look forward to seeing you there! Join us ：https://discord.gg/UjgXkPWNqA If you have a WeChat account，welcome to join our community on WeChat. You can add our assistant ：openmmlabwx. Please add "mmsig + Github ID" as a remark when adding friends：） Thank you again for your contribution❤ @warrentdrew