Matrix, Dimensions.
of WL must be nL by nL minus 1. For example, the dimensions of W2, for this, it will have to be 5 by 3, or it will be n2 by n1, because we’re going to compute Z2 as W2 times a1. Again, let’s ignore the bias for now. This is going to be 3 by 1. We need this to be 5 by 1. So this had better be 5 by