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12a232ef - Fix schedulers zero SNR and rescale classifier free guidance (#3664)

Fix schedulers zero SNR and rescale classifier free guidance (#3664) * Implement option for rescaling betas to zero terminal SNR * Implement rescale classifier free guidance in pipeline_stable_diffusion.py * focus on DDIM * make style * make style * make style * make style * Apply suggestions from Peter Lin * Apply suggestions from Peter Lin * make style * Apply suggestions from code review * Apply suggestions from code review * make style * make style --------- Co-authored-by: MaxWe00 <gitlab.9v1lq@slmail.me> Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>