Add (Scheduled) Pseudo-Huber Loss training scripts to research projects

[kabachuha]

This PR adds an option to use (Scheduled) Pseudo-Huber loss from https://arxiv.org/abs/2403.16728 for text2image and Dreambooth trainings.

Because of this feature being experimental, it's firstly needed to add it to the research projects.

See #7488 for detailed description, plots and examples

@sayakpaul @kashif @patil-suraj

[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[kabachuha]

The kohya-ss scripts have been merged after throughout testing in kohya-ss/sd-scripts#1228. Will update the rest of this Pull Request soon and prepare for merging in Diffusers

[sayakpaul]

Sure.

[kabachuha]

@sayakpaul updated all scripts, ready for merging

[kabachuha]

Should I do anything about the code quality?

[kashif]

you can run make style in the root folder to fix

[kabachuha]

@kashif what is make: ruff: No such file or directory?

nvm

[sayakpaul]

Please ping me once the CI run is complete.

[kabachuha]

@sayakpaul CI check ran, but failed.

I'm getting exhaused 😢

[sayakpaul]

If you check https://github.com/huggingface/diffusers/actions/runs/8641181505/job/23690277573?pr=7527, it clearly says the solution:

Run echo "Quality check failed. Please ensure the right dependency versions are installed with 'pip install -e .[quality]' and run 'make style && make quality'" >> $GITHUB_STEP_SUMMARY

Is it not helpful?

[kabachuha]

@sayakpaul Thanks for the instruction! Now I'll cross my fingers and hope it'll finally work🤞

Sorry for all these misunderstandings and extra commits 😓 (please, squash them when merging)

[sayakpaul]

Thank you for your contributions.