What is the function of `callback` in stable diffusion?

[g-jing]

I am reading the source code for stable diffusion pipeline. I wonder what is the function of callback? How to use it? Is there an example?

https://github.com/huggingface/diffusers/blob/29f15673ed5c14e4843d7c837890910207f72129/src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion.py#L585C13-L585C21

[patrickvonplaten]

Good point, we should probably make a nice doc page about it cc @yiyixuxu as this in line with our efforts here: #4778 maybe.

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the contributing guidelines are likely to be ignored.