Hi! I have trouble putting a clear mathematical definition to what a neural network actually is. As I understand the matter, a NN can be interpreted as a complex mathematical function. In conjunction with nonlinear activation functions it can therefore be seen as a nonlinear function. If this first part is indeed correct, what I don’t grasp is the fact that (I may be wrong here) mathematical functions can’t have, for example 7 inputs and 3 outputs. If I’m totally lost I apologize in advance. Thanks!