The device to which the timesteps should be moved to. If None, the timesteps are not moved.    Sets the discrete timesteps used for the diffusion chain (to be run before inference).  step  < source > ( model_output: Union timestep: Union sample: Union return_dict: bool = True s_noise: float = 1.0  ) → SchedulerOutput or tuple  Parameters   model_output (torch.FloatTensor or np.ndarray) —