(torch.FloatTensor) —
A current instance of a sample created by the diffusion process.   Returns 
torch.FloatTensor
  
The sample tensor at the previous timestep.
  One step for the second-order singlestep DPMSolver that computes the solution at time prev_timestep from the
time timestep_list[-2].  singlestep_dpm_solver_third_order_update  < source > ( model_output_list: List *args sample: FloatTensor = None **kwargs  ) → torch.FloatTensor  Para