Является ли код function [J, grad] = costFunction(theta, X, y)
function [J, grad] = costFunction(theta, X, y)
hx = sigmoid(X' * theta); m = length(X); J = sum(-y * log(hx) - (1 - y)*log(1 - hx)) / m; grad = X' * (hx - y) / m; end