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* improve: IterativeLatentUpscale - use geometric progression for upscale steps This is a small change to IterativeLatentUpscale that makes the sequence of the upscale steps to use geometric progression rather than arithmetic. This has the advantage that every step scales the intermediate image by the same factor. * feat: Iterative Upscale - support `step_mode` --------- Co-authored-by: Dr.Lt.Data <dr.lt.data@gmail.com> Co-authored-by: Dr.Lt.Data <128333288+ltdrdata@users.noreply.github.com>