A Distribution details A.1 q (z t | z s) The distribution of z

These are three equally valid views on the same model class, that have been used interchangeably in the literature. The parameterization of our model is discussed in Appendix B . In this section we provide details on the exact setup for each of our experiments. In Sections B.1 we describe the choices in common to each of our experiments. Our models are deeper than those used by Ho et al. [ 2020 ]. Specific numbers are given in Apart from the middle attention block that connects the upward and downward branches of the U-Net, we remove all other attention blocks from the model.