accuracy

auto xt = tensor!([0, 2])([[0.1, 0.9], [0.8, 0.2], [0.4, 0.6], [0.2, 0.8]]);
auto y0 = tensor!([0, 2])([[1.0, 0.0], [0.0, 1.0], [1.0, 0.0], [1.0, 0.0]]); // true: 0
auto y1 = tensor!([0, 2])([[1.0, 0.0], [0.0, 1.0], [1.0, 0.0], [0.0, 1.0]]); // true: 1
auto y2 = tensor!([0, 2])([[1.0, 0.0], [0.0, 1.0], [0.0, 1.0], [0.0, 1.0]]); // true: 2
auto y3 = tensor!([0, 2])([[1.0, 0.0], [1.0, 0.0], [0.0, 1.0], [0.0, 1.0]]); // true: 3
auto y4 = tensor!([0, 2])([[0.0, 1.0], [1.0, 0.0], [0.0, 1.0], [0.0, 1.0]]); // true: 4

assert(accuracy(xt, y0) == 0.0f);
assert(accuracy(xt, y1) == 0.25f);
assert(accuracy(xt, y2) == 0.5f);
assert(accuracy(xt, y3) == 0.75f);
assert(accuracy(xt, y4) == 1.0f);