mestep spacing strategy of equal spacing between timesteps on the training/distillation timestep
schedule is used. If timesteps is passed, num_inference_steps must be None.    Sets the discrete timesteps used for the diffusion chain (to be run before inference).  step  < source > ( model_output: FloatTensor timestep: int sample: FloatTensor generator: Optional = None return_dict: bool = True  ) → ~schedulers.scheduling_utils.LCMSchedulerOutput 