Function accuracy

examples/machine_learning/softmax_regression.cpp:20–26

using namespace af;

float accuracy(const array &predicted, const array &target) {
    array val, plabels, tlabels;
    max(val, tlabels, target, 1);
    max(val, plabels, predicted, 1);

    return 100 * count<float>(plabels == tlabels) / tlabels.elements();
}

float abserr(const array &predicted, const array &target) {
    return 100 * sum<float>(abs(predicted - target)) / predicted.elements();