php-ml/tests/Metric/AccuracyTest.php
Marcin Michalski db82afa263 Update to phpunit 8 and bump min php to 7.2 (#367)
* Update to phpunit 8

* Require at least PHP 7.2
2019-04-10 20:42:59 +02:00

57 lines
1.6 KiB
PHP

<?php
declare(strict_types=1);
namespace Phpml\Tests\Metric;
use Phpml\Classification\SVC;
use Phpml\CrossValidation\RandomSplit;
use Phpml\Dataset\Demo\IrisDataset;
use Phpml\Exception\InvalidArgumentException;
use Phpml\Metric\Accuracy;
use Phpml\SupportVectorMachine\Kernel;
use PHPUnit\Framework\TestCase;
class AccuracyTest extends TestCase
{
public function testThrowExceptionOnInvalidArguments(): void
{
$this->expectException(InvalidArgumentException::class);
$actualLabels = ['a', 'b', 'a', 'b'];
$predictedLabels = ['a', 'a'];
Accuracy::score($actualLabels, $predictedLabels);
}
public function testCalculateNormalizedScore(): void
{
$actualLabels = ['a', 'b', 'a', 'b'];
$predictedLabels = ['a', 'a', 'b', 'b'];
self::assertEquals(0.5, Accuracy::score($actualLabels, $predictedLabels));
}
public function testCalculateNotNormalizedScore(): void
{
$actualLabels = ['a', 'b', 'a', 'b'];
$predictedLabels = ['a', 'b', 'b', 'b'];
self::assertEquals(3, Accuracy::score($actualLabels, $predictedLabels, false));
}
public function testAccuracyOnDemoDataset(): void
{
$dataset = new RandomSplit(new IrisDataset(), 0.5, 123);
$classifier = new SVC(Kernel::RBF);
$classifier->train($dataset->getTrainSamples(), $dataset->getTrainLabels());
$predicted = (array) $classifier->predict($dataset->getTestSamples());
$accuracy = Accuracy::score($dataset->getTestLabels(), $predicted);
$expected = PHP_VERSION_ID >= 70100 ? 1 : 0.959;
self::assertEqualsWithDelta($expected, $accuracy, 0.01);
}
}