ativeSchedulerOutput or tuple.   Returns 
CMStochasticIterativeSchedulerOutput or tuple
  
If return_dict is True,
CMStochasticIterativeSchedulerOutput is returned,
otherwise a tuple is returned where the first element is the sample tensor.
  Predict the sample from the previous timestep by reversing the SDE. This function propagates the diffusion
process from the learned model outputs (most often the predicted noise).  CMStochasticIterativeSch