opencv/modules/ocl/test/test_ml.cpp

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// @Authors
//    Jin Ma,        jin@multicorewareinc.com
//    Xiaopeng Fu,   fuxiaopeng2222@163.com
//    Erping Pang,   pang_er_ping@163.com
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#include "test_precomp.hpp"
#ifdef HAVE_OPENCL
using namespace cv;
using namespace cv::ocl;
using namespace cvtest;
using namespace testing;
///////K-NEAREST NEIGHBOR//////////////////////////
static void genTrainData(Mat& trainData, int trainDataRow, int trainDataCol,
                         Mat& trainLabel = Mat().setTo(Scalar::all(0)), int nClasses = 0)
{
    cv::RNG &rng = TS::ptr()->get_rng();
    cv::Size size(trainDataCol, trainDataRow);
    trainData = randomMat(rng, size, CV_32FC1, 1.0, 1000.0, false);
    if(nClasses != 0)
    {
        cv::Size size1(trainDataRow, 1);
        trainLabel = randomMat(rng, size1, CV_8UC1, 0, nClasses - 1, false);
        trainLabel.convertTo(trainLabel, CV_32FC1);
    }
}

PARAM_TEST_CASE(KNN, int, Size, int, bool)
{
    int k;
    int trainDataCol;
    int testDataRow;
    int nClass;
    bool regression;
    virtual void SetUp()
    {
        k = GET_PARAM(0);
        nClass = GET_PARAM(2);
        trainDataCol = GET_PARAM(1).width;
        testDataRow = GET_PARAM(1).height;
        regression = GET_PARAM(3);
    }
};

TEST_P(KNN, Accuracy)
{
    Mat trainData, trainLabels;
    const int trainDataRow = 500;
    genTrainData(trainData, trainDataRow, trainDataCol, trainLabels, nClass);

    Mat testData, testLabels;
    genTrainData(testData, testDataRow, trainDataCol);

    KNearestNeighbour knn_ocl;
    CvKNearest knn_cpu;
    Mat best_label_cpu;
    oclMat best_label_ocl;

    /*ocl k-Nearest_Neighbor start*/
    oclMat trainData_ocl;
    trainData_ocl.upload(trainData);
    Mat simpleIdx;
    knn_ocl.train(trainData, trainLabels, simpleIdx, regression);

    oclMat testdata;
    testdata.upload(testData);
    knn_ocl.find_nearest(testdata, k, best_label_ocl);
    /*ocl k-Nearest_Neighbor end*/

    /*cpu k-Nearest_Neighbor start*/
    knn_cpu.train(trainData, trainLabels, simpleIdx, regression);
    knn_cpu.find_nearest(testData, k, &best_label_cpu);
    /*cpu k-Nearest_Neighbor end*/
    if(regression)
    {
        EXPECT_MAT_SIMILAR(Mat(best_label_ocl), best_label_cpu, 1e-5);
    }
    else
    {
        EXPECT_MAT_NEAR(Mat(best_label_ocl), best_label_cpu, 0.0);
    }
}
INSTANTIATE_TEST_CASE_P(OCL_ML, KNN, Combine(Values(6, 5), Values(Size(200, 400), Size(300, 600)),
    Values(4, 3), Values(false, true)));
#endif // HAVE_OPENCL