Add ViTPose

[NielsRogge]

What does this PR do?

This PR adds ViTPose as introduced in ViTPose: Simple Vision Transformer Baselines for Human Pose Estimation.

Here's a demo notebook - note that the API might change: https://colab.research.google.com/drive/15_3gjcC0wtKSH85k76zewt81eUJIEWWA?usp=sharing.

To do:

• get rid of cv2 dependency (?)

[HuggingFaceDocBuilderDev]

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[SangbumChoi]

@NielsRogge Hi Niels! Does this current PR works properly? (I want to do some test for this)

[amyeroberts]

Thanks for working on this @NielsRogge!

I can see there's a few bits unfinished e.g. tests. Is there a particular bit of code you'd like me to look at for a maintainers perspective?

For the issue description, there's a related model request is here: #24915

[amyeroberts]

@NielsRogge I'm unsubscribing atm, so that I don't get notifications on every new push. You just need to ping me again with my username when it's ready for review and I'll get notified