Sigmoid函数 (Logistic函数) 其实logistic函数也就是经常说的sigmoid函数,它的几何形状也就是一条sigmoid曲线(S型曲线)。A logistic function or logistic curve is a common “S” shape (sigmoid curve). 也就是说,sigmoid把一个值映射到0-1之间。 Softmax函数 在数学,尤其是概率论和相关领域中,Softmax函数,...
%% ===% Multinomial logistic regression% load data% ---% d: model demension% n: sample numbers% W: [w1, w2, ..., wK] weights for K classes% X: [x1, x2, ..., xn] n data for training% Y: [y1, y2, ..., yn] n labelsclear;clcdata_train=load('data_batch_1.mat');X...