use midpoint solvers.   lower_order_final (bool, defaults to True) —
Whether to use lower-order solvers in the final steps. Only valid for < 15 inference steps. This can
stabilize the sampling of DPMSolver for steps < 15, especially for steps <= 10.   euler_at_final (bool, defaults to False) —
Whether to use Euler’s method in the final step. It is a trade-off between numerical stability and detail
richness. This can stabilize the sampling of th