[pizza]

I think they’re referring to CUDA (and possibly other similar runtimes) being able to schedule floating point ops non-deterministically, combined with floating point arithmetic being potentially non-associative. I’m not personally sure how big an issue that would be for the output though.

[yreg]

I have never spotted any difference when regenerating (a recent) image with the same settings/seed/noise and I do it often. Haven't compared the bits though.

Older images are often difficult to reproduce for me - I believe due to changes in tooling (mostly updating Auto1111).

[Our_Benefactors]

Differences in output are generally varying levels of difficulty of “spot the difference” and rarely changes the overall image composition by much. I always use nondeterministic algos and it doesn’t have any affect on my ability to refine prompts effectively.

[TacticalCoder]

Yeah this is what I was referring to: GPU/FP issue which, btw, had been explained to me in the past here on HN...