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

<?php
declare(strict_types = 1);

namespace tests\Clustering;

use Phpml\Clustering\DBSCAN;

class DBSCANTest extends \PHPUnit_Framework_TestCase
{

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

        $clustered = [
            [[1, 1], [1, 2], [2, 1]],
            [[8, 7], [7, 8], [8, 9]]
        ];

        $dbscan = new DBSCAN($epsilon = 2, $minSamples = 3);

        $this->assertEquals($clustered, $dbscan->cluster($samples));
    }

    public function testDBSCANSamplesInCircleClustering()
    {
        $samples = [[1, 1],[6, 6],[1, -1],[5, 6],[-1, -1],[7, 8],[-1, 1],[7, 7]];

        $clustered = [
            [[1, 1],[1, -1],[-1, -1],[-1, 1]],
            [[6, 6],[5, 6],[7, 8],[7, 7]]
        ];

        $dbscan = new DBSCAN($epsilon = 3, $minSamples = 4);

        $this->assertEquals($clustered, $dbscan->cluster($samples));
    }

}