list of outdated schedulers we need to remove/deprecate

[yiyixuxu]

I'm compiling a list of outdated schedulers we can remove/deprecate here. Below are just a few I have in mind. There are many schedulers we have that I'm not super familiar with. So please help me complete this list! 🤗🤗🤗

• KarrasVeScheduler
  • I think we can just delete this?
• DPMSolverSDEScheduler
  • we should add the SDE variant to DPMSolverSinglestepScheduler and then deprecate this pipeline
• the "dpmsolver", "sde-dpmsolver" algorithms in DPMSolverMultistepScheduler:
  • do we use them at all? Based on the paper, it does not work with the guidance scale and is not as good as the dpmsolver+++ scheduler the same author proposed later. They are part of the same scheduler, so I'm fine keeping them. But I would favor deleting them if possible because it is a bit overwhelming and confusing with too many different options.

[patrickvonplaten]

The following one can also be deprecated: https://github.com/huggingface/diffusers/blob/main/src/diffusers/schedulers/scheduling_sde_vp.py

Let's put all these schedulers in a schedulers/deprecated/ folder and don't run tests on them anymore

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