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* UniPC Multistep add `rescale_betas_zero_snr` Same patch as DPM and Euler with the patched final alpha cumprod BF16 doesn't seem to break down, I think cause UniPC upcasts during some phases already? We could still force an upcast since it only loses ≈ 0.005 it/s for me but the difference in output is very small. A better endeavor might upcasting in step() and removing all the other upcasts elsewhere? * UniPC ZSNR UT * Re-add `rescale_betas_zsnr` doc oops