set_alpha_to_one=False to make the last step use step 0 for the previous alpha product like in Stable
Diffusion.    Scheduler with Heun steps for discrete beta schedules. This model inherits from SchedulerMixin and ConfigMixin. Check the superclass documentation for the generic
methods the library implements for all schedulers such as loading and saving.  scale_model_input  < source > ( sample: FloatTensor timestep: Union  ) → torch.FloatTensor