random splitter skeleton

src/Phpml/CrossValidation/RandomSplit.php

@@ -0,0 +1,72 @@
+<?php
+
+declare (strict_types = 1);
+
+namespace Phpml\CrossValidation;
+
+use Phpml\Dataset\Dataset;
+use Phpml\Exception\InvalidArgumentException;
+
+class RandomSplit
+{
+    /**
+     * @var array
+     */
+    private $trainSamples = [];
+
+    /**
+     * @var array
+     */
+    private $testSamples = [];
+
+    /**
+     * @var array
+     */
+    private $trainLabels = [];
+
+    /**
+     * @var array
+     */
+    private $testLabels = [];
+
+    public function __construct(Dataset $dataset, float $testSize = 0.3)
+    {
+        if (0 > $testSize || 1 < $testSize) {
+            throw InvalidArgumentException::percentNotInRange('testSize');
+        }
+
+        // TODO: implement this !
+    }
+
+    /**
+     * @return array
+     */
+    public function getTrainSamples()
+    {
+        return $this->trainSamples;
+    }
+
+    /**
+     * @return array
+     */
+    public function getTestSamples()
+    {
+        return $this->testSamples;
+    }
+
+    /**
+     * @return array
+     */
+    public function getTrainLabels()
+    {
+        return $this->trainLabels;
+    }
+
+    /**
+     * @return array
+     */
+    public function getTestLabels()
+    {
+        return $this->testLabels;
+    }
+}