php-ml/tests/Regression/LeastSquaresTest.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

94 lines
3.7 KiB
PHP

<?php
declare(strict_types=1);
namespace Phpml\Tests\Regression;
use Phpml\ModelManager;
use Phpml\Regression\LeastSquares;
use PHPUnit\Framework\TestCase;
class LeastSquaresTest extends TestCase
{
public function testPredictSingleFeatureSamples(): void
{
$delta = 0.01;
//https://www.easycalculation.com/analytical/learn-least-square-regression.php
$samples = [[60], [61], [62], [63], [65]];
$targets = [3.1, 3.6, 3.8, 4, 4.1];
$regression = new LeastSquares();
$regression->train($samples, $targets);
self::assertEqualsWithDelta(4.06, $regression->predict([64]), $delta);
//http://www.stat.wmich.edu/s216/book/node127.html
$samples = [[9300], [10565], [15000], [15000], [17764], [57000], [65940], [73676], [77006], [93739], [146088], [153260]];
$targets = [7100, 15500, 4400, 4400, 5900, 4600, 8800, 2000, 2750, 2550, 960, 1025];
$regression = new LeastSquares();
$regression->train($samples, $targets);
self::assertEqualsWithDelta(7659.35, $regression->predict([9300]), $delta);
self::assertEqualsWithDelta(5213.81, $regression->predict([57000]), $delta);
self::assertEqualsWithDelta(4188.13, $regression->predict([77006]), $delta);
self::assertEqualsWithDelta(7659.35, $regression->predict([9300]), $delta);
self::assertEqualsWithDelta(278.66, $regression->predict([153260]), $delta);
}
public function testPredictSingleFeatureSamplesWithMatrixTargets(): void
{
$delta = 0.01;
//https://www.easycalculation.com/analytical/learn-least-square-regression.php
$samples = [[60], [61], [62], [63], [65]];
$targets = [[3.1], [3.6], [3.8], [4], [4.1]];
$regression = new LeastSquares();
$regression->train($samples, $targets);
self::assertEqualsWithDelta(4.06, $regression->predict([64]), $delta);
}
public function testPredictMultiFeaturesSamples(): void
{
$delta = 0.01;
//http://www.stat.wmich.edu/s216/book/node129.html
$samples = [[73676, 1996], [77006, 1998], [10565, 2000], [146088, 1995], [15000, 2001], [65940, 2000], [9300, 2000], [93739, 1996], [153260, 1994], [17764, 2002], [57000, 1998], [15000, 2000]];
$targets = [2000, 2750, 15500, 960, 4400, 8800, 7100, 2550, 1025, 5900, 4600, 4400];
$regression = new LeastSquares();
$regression->train($samples, $targets);
self::assertEqualsWithDelta(-800614.957, $regression->getIntercept(), $delta);
self::assertEqualsWithDelta([-0.0327, 404.14], $regression->getCoefficients(), $delta);
self::assertEqualsWithDelta(4094.82, $regression->predict([60000, 1996]), $delta);
self::assertEqualsWithDelta(5711.40, $regression->predict([60000, 2000]), $delta);
}
public function testSaveAndRestore(): void
{
//https://www.easycalculation.com/analytical/learn-least-square-regression.php
$samples = [[60], [61], [62], [63], [65]];
$targets = [[3.1], [3.6], [3.8], [4], [4.1]];
$regression = new LeastSquares();
$regression->train($samples, $targets);
//http://www.stat.wmich.edu/s216/book/node127.html
$testSamples = [[9300], [10565], [15000]];
$predicted = $regression->predict($testSamples);
$filename = 'least-squares-test-'.random_int(100, 999).'-'.uniqid('', false);
$filepath = (string) tempnam(sys_get_temp_dir(), $filename);
$modelManager = new ModelManager();
$modelManager->saveToFile($regression, $filepath);
$restoredRegression = $modelManager->restoreFromFile($filepath);
self::assertEquals($regression, $restoredRegression);
self::assertEquals($predicted, $restoredRegression->predict($testSamples));
}
}