 order of
accuracy is solver_order + 1 due to the UniC. We recommend to use solver_order=2 for guided sampling,
and solver_order=3 for unconditional sampling.


prediction_type (str, default epsilon, optional) —
prediction type of the scheduler function, one of epsilon (predicting the noise of the diffusion
process), sample (directly predicting the noisy sample) or v_prediction` (see section 2.4
https://imagen.research.google/video/paper.pdf)

