system computes an incredibly complicated function of the input right it looks all those numbers and those pixel values and tells you that that's the motorcycle exhaust pipe and so two approaches that we could try to build such a system as you could try to directly implement this complicated function which is what I think of as a hand engineering approach or maybe you can try to learn this function instead right and in kind of a side comment maybe only for the aficionados the machine learning is that if you look at