combinatorial problem but the idea is that you know you can actually learn to construct good architectures and by doing so you can you can sort of speed up this process that is manual otherwise and the idea behind it is there some regularity of when an architecture is good there's some like high level of pattern that you as a human maybe cannot really grasp but like a machine can figure out which architectures are good and which ones aren't so there have been a few inventions in this in this area but they are mostly costly that's what