Add type hint and exceptions annotation

src/Phpml/Clustering/KMeans/Cluster.php

@@ -60,6 +60,8 @@ class Cluster extends Point implements IteratorAggregate, Countable
      * @param Point $point
      *
      * @return Point
+     *
+     * @throws \LogicException
      */
     public function attach(Point $point)
     {

src/Phpml/Clustering/KMeans/Point.php

@@ -53,11 +53,11 @@ class Point implements ArrayAccess
     }
 
     /**
-     * @param $points
+     * @param array $points
      *
      * @return mixed
      */
-    public function getClosest($points)
+    public function getClosest(array $points)
     {
         foreach ($points as $point) {
             $distance = $this->getDistanceWith($point, false);

src/Phpml/Clustering/KMeans/Space.php

@@ -65,7 +65,7 @@ class Space extends SplObjectStorage
     }
 
     /**
-     * @param object $point
+     * @param Point $point
      * @param null   $data
      */
     public function attach($point, $data = null)