public class LogisticCostFun
LogisticCostFun implements Breeze's DiffFunction[T] for a multinomial (softmax) logistic loss
function, as used in multi-class classification (it is also used in binary logistic regression).
It returns the loss and gradient with L2 regularization at a particular point (coefficients).
It's used in Breeze's convex optimization routines.
Constructor and Description