php-ml/tests/Classification/DecisionTreeTest.php
2018-10-28 07:44:52 +01:00

93 lines
3.3 KiB
PHP

<?php
declare(strict_types=1);
namespace Phpml\Tests\Classification;
use Phpml\Classification\DecisionTree;
use Phpml\ModelManager;
use PHPUnit\Framework\TestCase;
class DecisionTreeTest extends TestCase
{
/**
* @var array
*/
private $data = [
['sunny', 85, 85, 'false', 'Dont_play'],
['sunny', 80, 90, 'true', 'Dont_play'],
['overcast', 83, 78, 'false', 'Play'],
['rain', 70, 96, 'false', 'Play'],
['rain', 68, 80, 'false', 'Play'],
['rain', 65, 70, 'true', 'Dont_play'],
['overcast', 64, 65, 'true', 'Play'],
['sunny', 72, 95, 'false', 'Dont_play'],
['sunny', 69, 70, 'false', 'Play'],
['rain', 75, 80, 'false', 'Play'],
['sunny', 75, 70, 'true', 'Play'],
['overcast', 72, 90, 'true', 'Play'],
['overcast', 81, 75, 'false', 'Play'],
['rain', 71, 80, 'true', 'Dont_play'],
];
/**
* @var array
*/
private $extraData = [
['scorching', 90, 95, 'false', 'Dont_play'],
['scorching', 100, 93, 'true', 'Dont_play'],
];
public function testPredictSingleSample(): void
{
[$data, $targets] = $this->getData($this->data);
$classifier = new DecisionTree(5);
$classifier->train($data, $targets);
self::assertEquals('Dont_play', $classifier->predict(['sunny', 78, 72, 'false']));
self::assertEquals('Play', $classifier->predict(['overcast', 60, 60, 'false']));
self::assertEquals('Dont_play', $classifier->predict(['rain', 60, 60, 'true']));
[$data, $targets] = $this->getData($this->extraData);
$classifier->train($data, $targets);
self::assertEquals('Dont_play', $classifier->predict(['scorching', 95, 90, 'true']));
self::assertEquals('Play', $classifier->predict(['overcast', 60, 60, 'false']));
}
public function testSaveAndRestore(): void
{
[$data, $targets] = $this->getData($this->data);
$classifier = new DecisionTree(5);
$classifier->train($data, $targets);
$testSamples = [['sunny', 78, 72, 'false'], ['overcast', 60, 60, 'false']];
$predicted = $classifier->predict($testSamples);
$filename = 'decision-tree-test-'.random_int(100, 999).'-'.uniqid('', false);
$filepath = (string) tempnam(sys_get_temp_dir(), $filename);
$modelManager = new ModelManager();
$modelManager->saveToFile($classifier, $filepath);
$restoredClassifier = $modelManager->restoreFromFile($filepath);
self::assertEquals($classifier, $restoredClassifier);
self::assertEquals($predicted, $restoredClassifier->predict($testSamples));
}
public function testTreeDepth(): void
{
[$data, $targets] = $this->getData($this->data);
$classifier = new DecisionTree(5);
$classifier->train($data, $targets);
self::assertTrue($classifier->actualDepth <= 5);
}
private function getData(array $input): array
{
$targets = array_column($input, 4);
array_walk($input, function (&$v): void {
array_splice($v, 4, 1);
});
return [$input, $targets];
}
}