www.gusucode.com > SAE RBM 程序MATLAB源码代码实现的一个关于sae的例子 > minFunc/logistic/LogisticHv.m
function [Hv] = LogisticHv(v,w,X,y) % v(feature,1) - vector that we will multiply Hessian by % w(feature,1) % X(instance,feature) % y(instance,1) sig = 1./(1+exp(-y.*(X*w))); Hv = X.'*(sig.*(1-sig).*(X*v));