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5effcd3e - [Bug fix] "previous_timestep()" in DDPM scheduling compatible with "trailing" and "linspace" options (#9384)

[Bug fix] "previous_timestep()" in DDPM scheduling compatible with "trailing" and "linspace" options (#9384) * Update scheduling_ddpm.py * fix copies --------- Co-authored-by: YiYi Xu <yixu310@gmail.com> Co-authored-by: hlky <hlky@hlky.ac>