lver_order=2 for guided sampling like in Stable Diffusion.   solver_type (str, defaults to midpoint) —
Solver type for the second-order solver; can be midpoint or heun. The solver type slightly affects the
sample quality, especially for a small number of steps. It is recommended to 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