compression at all and so if you compare this expression with this expression up here you see that this is the missing term so somehow this this naive approach does not take into effect take into account this jacobian the the fact that the flow changes the volume so we have to somehow deal with that right okay so how do we do this well the claim is that we can turn any flow model into a VA actually we can locally approximate it using a VA so we have this flow model that takes here's F here's the full model and