Update dependencies and fix code styles (#334)

src/Classification/Ensemble/Bagging.php

@@ -157,7 +157,7 @@ class Bagging implements Classifier
     {
         $predictions = [];
         foreach ($this->classifiers as $classifier) {
-            /* @var $classifier Classifier */
+            /** @var Classifier $classifier */
             $predictions[] = $classifier->predict($sample);
         }
 

src/Classification/Ensemble/RandomForest.php

@@ -86,7 +86,7 @@ class RandomForest extends Bagging
         // Traverse each tree and sum importance of the columns
         $sum = [];
         foreach ($this->classifiers as $tree) {
-            /* @var $tree DecisionTree */
+            /** @var DecisionTree $tree */
             $importances = $tree->getFeatureImportances();
 
             foreach ($importances as $column => $importance) {

src/Clustering/FuzzyCMeans.php

@@ -18,7 +18,7 @@ class FuzzyCMeans implements Clusterer
     private $clustersNumber;
 
     /**
-     * @var array|Cluster[]
+     * @var Cluster[]
      */
     private $clusters = [];
 
@@ -28,7 +28,7 @@ class FuzzyCMeans implements Clusterer
     private $space;
 
     /**
-     * @var array|float[][]
+     * @var float[][]
      */
     private $membership = [];
 

src/Clustering/KMeans/Space.php

@@ -116,7 +116,7 @@ class Space extends SplObjectStorage
     }
 
     /**
-     * @return array|Cluster[]
+     * @return Cluster[]
      */
     public function cluster(int $clustersNumber, int $initMethod = KMeans::INIT_RANDOM): array
     {
@@ -129,7 +129,7 @@ class Space extends SplObjectStorage
     }
 
     /**
-     * @return array|Cluster[]
+     * @return Cluster[]
      */
     protected function initializeClusters(int $clustersNumber, int $initMethod): array
     {

src/CrossValidation/StratifiedRandomSplit.php

@@ -19,7 +19,7 @@ class StratifiedRandomSplit extends RandomSplit
     }
 
     /**
-     * @return Dataset[]|array
+     * @return Dataset[]
      */
     private function splitByTarget(Dataset $dataset): array
     {

src/Math/Statistic/ANOVA.php

@@ -17,9 +17,9 @@ final class ANOVA
      * the same population mean. The test is applied to samples from two or
      * more groups, possibly with differing sizes.
      *
-     * @param array|array[] $samples - each row is class samples
+     * @param array[] $samples - each row is class samples
      *
-     * @return array|float[]
+     * @return float[]
      */
     public static function oneWayF(array $samples): array
     {

src/Math/Statistic/Correlation.php

@@ -9,8 +9,8 @@ use Phpml\Exception\InvalidArgumentException;
 class Correlation
 {
     /**
-     * @param array|int[]|float[] $x
+     * @param int[]|float[] $x
-     * @param array|int[]|float[] $y
+     * @param int[]|float[] $y
      *
      * @throws InvalidArgumentException
      */

src/Math/Statistic/StandardDeviation.php

@@ -9,7 +9,7 @@ use Phpml\Exception\InvalidArgumentException;
 class StandardDeviation
 {
     /**
-     * @param array|float[]|int[] $numbers
+     * @param float[]|int[] $numbers
      */
     public static function population(array $numbers, bool $sample = true): float
     {
@@ -39,7 +39,7 @@ class StandardDeviation
      * Sum of squares deviations
      * ∑⟮xᵢ - μ⟯²
      *
-     * @param array|float[]|int[] $numbers
+     * @param float[]|int[] $numbers
      */
     public static function sumOfSquares(array $numbers): float
     {

src/Pipeline.php

@@ -7,7 +7,7 @@ namespace Phpml;
 class Pipeline implements Estimator
 {
     /**
-     * @var array|Transformer[]
+     * @var Transformer[]
      */
     private $transformers = [];
 
@@ -17,7 +17,7 @@ class Pipeline implements Estimator
     private $estimator;
 
     /**
-     * @param array|Transformer[] $transformers
+     * @param Transformer[] $transformers
      */
     public function __construct(array $transformers, Estimator $estimator)
     {
@@ -39,7 +39,7 @@ class Pipeline implements Estimator
     }
 
     /**
-     * @return array|Transformer[]
+     * @return Transformer[]
      */
     public function getTransformers(): array
     {