php-ml/tests/Phpml/Clustering/KMeansTest.php

<?php
declare(strict_types = 1);

namespace tests\Clustering;

use Phpml\Clustering\KMeans;

class KMeansTest extends \PHPUnit_Framework_TestCase
{

    public function testKMeansSamplesClustering()
    {
        $samples = [[1, 1], [8, 7], [1, 2], [7, 8], [2, 1], [8, 9]];

        $kmeans = new KMeans(2);
        $clusters = $kmeans->cluster($samples);

        $this->assertEquals(2, count($clusters));

        foreach ($samples as $index => $sample) {
            if(in_array($sample, $clusters[0]) || in_array($sample, $clusters[1])) {
                unset($samples[$index]);
            }
        }
        $this->assertEquals(0, count($samples));
    }

    public function testKMeansMoreSamplesClustering()
    {
        $samples = [
            [80,55],[86,59],[19,85],[41,47],[57,58],
            [76,22],[94,60],[13,93],[90,48],[52,54],
            [62,46],[88,44],[85,24],[63,14],[51,40],
            [75,31],[86,62],[81,95],[47,22],[43,95],
            [71,19],[17,65],[69,21],[59,60],[59,12],
            [15,22],[49,93],[56,35],[18,20],[39,59],
            [50,15],[81,36],[67,62],[32,15],[75,65],
            [10,47],[75,18],[13,45],[30,62],[95,79],
            [64,11],[92,14],[94,49],[39,13],[60,68],
            [62,10],[74,44],[37,42],[97,60],[47,73],
        ];

        $kmeans = new KMeans(4);
        $clusters = $kmeans->cluster($samples);

        $this->assertEquals(4, count($clusters));

        foreach ($samples as $index => $sample) {
            for($i=0; $i<4; $i++) {
                if(in_array($sample, $clusters[$i])) {
                    unset($samples[$index]);
                }
            }
        }
        $this->assertEquals(0, count($samples));
    }

}