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<?php |
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declare(strict_types=1); |
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namespace Phpml\Clustering\KMeans; |
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use IteratorAggregate; |
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use LogicException; |
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use SplObjectStorage; |
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class Cluster extends Point implements IteratorAggregate |
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{ |
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/** |
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* @var Space |
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*/ |
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protected $space; |
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/** |
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* @var SplObjectStorage|Point[] |
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*/ |
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protected $points; |
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public function __construct(Space $space, array $coordinates) |
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{ |
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parent::__construct($coordinates); |
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$this->space = $space; |
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$this->points = new SplObjectStorage(); |
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} |
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public function getPoints(): array |
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{ |
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$points = []; |
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foreach ($this->points as $point) { |
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if ($point->label === null) { |
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$points[] = $point; |
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} else { |
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$points[$point->label] = $point; |
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} |
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} |
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return $points; |
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} |
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public function getSpace(): Space |
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{ |
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return $this->space; |
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} |
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public function toArray(): array |
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{ |
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return [ |
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'centroid' => parent::toArray(), |
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'points' => array_map(function ($point) { |
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return $point->toArray(); |
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}, $this->getPoints()), |
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]; |
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} |
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public function attach(Point $point): Point |
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{ |
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if ($point instanceof self) { |
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throw new LogicException('Cannot attach a cluster to another'); |
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} |
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$this->points->attach($point); |
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return $point; |
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} |
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public function detach(Point $point): Point |
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{ |
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$this->points->detach($point); |
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return $point; |
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} |
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public function attachAll(SplObjectStorage $points): void |
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{ |
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$this->points->addAll($points); |
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} |
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public function detachAll(SplObjectStorage $points): void |
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{ |
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$this->points->removeAll($points); |
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} |
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public function updateCentroid(): void |
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{ |
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$count = count($this->points); |
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if ($count === 0) { |
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return; |
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} |
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$centroid = $this->space->newPoint(array_fill(0, $this->dimension, 0)); |
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foreach ($this->points as $point) { |
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for ($n = 0; $n < $this->dimension; ++$n) { |
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$centroid->coordinates[$n] += $point->coordinates[$n]; |
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} |
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} |
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for ($n = 0; $n < $this->dimension; ++$n) { |
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$this->coordinates[$n] = $centroid->coordinates[$n] / $count; |
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} |
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} |
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/** |
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* @return Point[]|SplObjectStorage |
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*/ |
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public function getIterator() |
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{ |
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return $this->points; |
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} |
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public function count(): int |
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{ |
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return count($this->points); |
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} |
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public function setCoordinates(array $newCoordinates): void |
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{ |
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$this->coordinates = $newCoordinates; |
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} |
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} |
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php-ai /
php-ml
