php-ml/tests/Math/Distance/MinkowskiTest.php

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<?php
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declare(strict_types=1);
namespace Phpml\Tests\Math\Distance;
use Phpml\Exception\InvalidArgumentException;
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use Phpml\Math\Distance\Minkowski;
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use PHPUnit\Framework\TestCase;
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class MinkowskiTest extends TestCase
{
/**
* @var Minkowski
*/
private $distanceMetric;
public function setUp(): void
{
$this->distanceMetric = new Minkowski();
}
public function testThrowExceptionOnInvalidArguments(): void
{
$this->expectException(InvalidArgumentException::class);
$a = [0, 1, 2];
$b = [0, 2];
$this->distanceMetric->distance($a, $b);
}
public function testCalculateDistanceForOneDimension(): void
{
$a = [4];
$b = [2];
$expectedDistance = 2;
$actualDistance = $this->distanceMetric->distance($a, $b);
$this->assertEquals($expectedDistance, $actualDistance);
}
public function testCalculateDistanceForTwoDimensions(): void
{
$a = [4, 6];
$b = [2, 5];
$expectedDistance = 2.080;
$actualDistance = $this->distanceMetric->distance($a, $b);
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$this->assertEquals($expectedDistance, $actualDistance, '', $delta = 0.001);
}
public function testCalculateDistanceForThreeDimensions(): void
{
$a = [6, 10, 3];
$b = [2, 5, 5];
$expectedDistance = 5.819;
$actualDistance = $this->distanceMetric->distance($a, $b);
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$this->assertEquals($expectedDistance, $actualDistance, '', $delta = 0.001);
}
public function testCalculateDistanceForThreeDimensionsWithDifferentLambda(): void
{
$distanceMetric = new Minkowski($lambda = 5);
$a = [6, 10, 3];
$b = [2, 5, 5];
$expectedDistance = 5.300;
$actualDistance = $distanceMetric->distance($a, $b);
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$this->assertEquals($expectedDistance, $actualDistance, '', $delta = 0.001);
}
}