Multistep DPM++ SDE samplers for RF #8541
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Include alpha in sampling and minor refactoring
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Using the same approach as in #8529.
Additionally, this PR slightly unifies the style between 2M and 3M.
It doesn't include
dpmpp_sdesince that implementation is based on ancestral sampling.In general, this
dpmpp_2m_sdewitheta=0leads to less aggressive results compared to the currentdpmpp_2min RF, because its weighting factor1/ris smaller.SD 3.5 medium, CFG=4.0 and sgm_uniform.
