with our regressive models whether you want to use very expressive fluids but very few or whether you want to use shallow flows which are not particularly expressive but then keep on stacking them so that you can get a very expressive compose model how do you use multi scale losses for a trait and how do you trade off between your density estimates and your sample quality and how to use the representations you derive at various levels of the flow model for downstream tasks all these are like fundamental advances think about