test_kmeans.cpp
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// This file is part of OpenCV project.
// It is subject to the license terms in the LICENSE file found in the top-level directory
// of this distribution and at http://opencv.org/license.html.
#include "test_precomp.hpp"
namespace opencv_test { namespace {
TEST(ML_KMeans, accuracy)
{
const int iters = 100;
int sizesArr[] = { 5000, 7000, 8000 };
int pointsCount = sizesArr[0]+ sizesArr[1] + sizesArr[2];
Mat data( pointsCount, 2, CV_32FC1 ), labels;
vector<int> sizes( sizesArr, sizesArr + sizeof(sizesArr) / sizeof(sizesArr[0]) );
Mat means;
vector<Mat> covs;
defaultDistribs( means, covs );
generateData( data, labels, sizes, means, covs, CV_32FC1, CV_32SC1 );
TermCriteria termCriteria( TermCriteria::COUNT, iters, 0.0);
{
SCOPED_TRACE("KMEANS_PP_CENTERS");
float err = 1000;
Mat bestLabels;
kmeans( data, 3, bestLabels, termCriteria, 0, KMEANS_PP_CENTERS, noArray() );
EXPECT_TRUE(calcErr( bestLabels, labels, sizes, err , false ));
EXPECT_LE(err, 0.01f);
}
{
SCOPED_TRACE("KMEANS_RANDOM_CENTERS");
float err = 1000;
Mat bestLabels;
kmeans( data, 3, bestLabels, termCriteria, 0, KMEANS_RANDOM_CENTERS, noArray() );
EXPECT_TRUE(calcErr( bestLabels, labels, sizes, err, false ));
EXPECT_LE(err, 0.01f);
}
{
SCOPED_TRACE("KMEANS_USE_INITIAL_LABELS");
float err = 1000;
Mat bestLabels;
labels.copyTo( bestLabels );
RNG &rng = cv::theRNG();
for( int i = 0; i < 0.5f * pointsCount; i++ )
bestLabels.at<int>( rng.next() % pointsCount, 0 ) = rng.next() % 3;
kmeans( data, 3, bestLabels, termCriteria, 0, KMEANS_USE_INITIAL_LABELS, noArray() );
EXPECT_TRUE(calcErr( bestLabels, labels, sizes, err, false ));
EXPECT_LE(err, 0.01f);
}
}
}} // namespace