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65f9439b - [Schedulers] Add exponential sigmas / exponential noise schedule (#9499)

[Schedulers] Add exponential sigmas / exponential noise schedule (#9499) * exponential sigmas * Apply suggestions from code review Co-authored-by: YiYi Xu <yixu310@gmail.com> * make style --------- Co-authored-by: YiYi Xu <yixu310@gmail.com>