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<?php
declare(strict_types=1);
namespace Phpml\Clustering;
use Phpml\Clustering\KMeans\Space;
use Phpml\Exception\InvalidArgumentException;
class KMeans implements Clusterer
{
public const INIT_RANDOM = 1;
public const INIT_KMEANS_PLUS_PLUS = 2;
/**
* @var int
*/
private $clustersNumber;
private $initialization;
* @var array
private $centronoids = [];
public function __construct(int $clustersNumber, int $initialization = self::INIT_KMEANS_PLUS_PLUS)
if ($clustersNumber <= 0) {
throw new InvalidArgumentException('Invalid clusters number');
}
$this->clustersNumber = $clustersNumber;
$this->initialization = $initialization;
public function cluster(array $samples): array
$space = new Space(count(reset($samples)));
foreach ($samples as $key => $sample) {
$space->addPoint($sample, $key);
$clusters = [];
foreach ($space->cluster($this->clustersNumber, $this->initialization) as $cluster) {
$clusters[] = $cluster->getPoints();
$arrayCluster = $cluster->toArray();
$this->centronoids[] = $arrayCluster['centroid'];
return $clusters;
public function centronoids(): array
return $this->centronoids;
php-ai /
php-ml
