the diffusion chain (to be run before inference).  step  < source > ( model_output: FloatTensor timestep: int sample: FloatTensor generator = None return_dict: bool = True  ) → DDPMSchedulerOutput or tuple  Parameters   model_output (torch.FloatTensor) —
The direct output from learned diffusion model.   timestep (float) —
The current discrete timestep in the diffusion chain.   sample (torch.FloatTensor) —
A current instance of a sample created 