ault True) —
whether to use lower-order solvers in the final steps. Only valid for < 15 inference steps. We empirically
find this trick can stabilize the sampling of DEIS for steps < 15, especially for steps <= 10.



DEIS (https://arxiv.org/abs/2204.13902) is a fast high order solver for diffusion ODEs. We slightly modify the
polynomial fitting formula in log-rho space instead of the original linear t space in DEIS paper. The modification
enjo