 the previous one. For the final
step there is no previous alpha. When this option is True the previous alpha product is fixed to 1,
otherwise it uses the value of alpha at step 0.


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


steps_offset (int, defaul