future pyramid network and you can think of this as let's say you want to produce a dense map of everything that's in the image so for every pixel in the input you want to give a category of an instance or or category whether it's an object or kind of a background region if you want so you have you know a bunch of layers of a commercial net where the spatial resolution goes down as you go up because of subsampling and then you have sort of a similarly architected network that can it goes the other way from low