chain.


sample (torch.FloatTensor) —
current instance of sample being created by diffusion process.


Returns

torch.FloatTensor



the sample tensor at the previous timestep.


One step for the first-order DPM-Solver (equivalent to DDIM).
See https://arxiv.org/abs/2206.00927 for the detailed derivation.

multistep_dpm_solver_second_order_update

<
source
>
(
model_output_list: typing.List[torch.FloatTensor]
timestep_list: typing.List[int]
pre