35     protected $points;  variable in KMeans\\Cluster
40         $this->points = new \SplObjectStorage();
45         $points = [];
46         foreach ($this->points as $point) {
47             $points[] = $point->toArray();
52             'points'   => $points,
62         $this->points->attach($point);
68         $this->points->detach($point);
72     public function attachAll(\SplObjectStorage $points): void  argument
74         $this->points->addAll($points);
77     public function detachAll(\SplObjectStorage $points): void  argument
79         $this->points->removeAll($points);
84         if (!$count = count($this->points)) {
90         foreach ($this->points as $point) {
103         return $this->points;
108         return count($this->points);