69 lines
2.4 KiB
PHP
69 lines
2.4 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Phpml\Tests\Regression;
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use Phpml\Exception\InvalidOperationException;
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use Phpml\ModelManager;
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use Phpml\Regression\DecisionTreeRegressor;
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use PHPUnit\Framework\TestCase;
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class DecisionTreeRegressorTest extends TestCase
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{
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public function testPredictSingleFeatureSamples(): void
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{
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$delta = 0.01;
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$samples = [[60], [61], [62], [63], [65]];
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$targets = [3.1, 3.6, 3.8, 4, 4.1];
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$regression = new DecisionTreeRegressor(4);
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$regression->train($samples, $targets);
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self::assertEqualsWithDelta([4.05], $regression->predict([[64]]), $delta);
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$samples = [[9300], [10565], [15000], [15000], [17764], [57000], [65940], [73676], [77006], [93739], [146088], [153260]];
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$targets = [7100, 15500, 4400, 4400, 5900, 4600, 8800, 2000, 2750, 2550, 960, 1025];
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$regression = new DecisionTreeRegressor();
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$regression->train($samples, $targets);
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self::assertEqualsWithDelta([11300.0], $regression->predict([[9300]]), $delta);
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self::assertEqualsWithDelta([5250.0], $regression->predict([[57000]]), $delta);
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self::assertEqualsWithDelta([2433.33], $regression->predict([[77006]]), $delta);
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self::assertEqualsWithDelta([11300.0], $regression->predict([[9300]]), $delta);
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self::assertEqualsWithDelta([992.5], $regression->predict([[153260]]), $delta);
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}
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public function testPreventPredictWhenNotTrained(): void
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{
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$regression = new DecisionTreeRegressor();
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$this->expectException(InvalidOperationException::class);
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$regression->predict([[1]]);
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}
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public function testSaveAndRestore(): void
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{
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$samples = [[60], [61], [62], [63], [65]];
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$targets = [3.1, 3.6, 3.8, 4, 4.1];
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$regression = new DecisionTreeRegressor(4);
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$regression->train($samples, $targets);
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$testSamples = [[9300], [10565], [15000]];
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$predicted = $regression->predict($testSamples);
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$filename = 'least-squares-test-'.random_int(100, 999).'-'.uniqid('', false);
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$filepath = (string) tempnam(sys_get_temp_dir(), $filename);
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$modelManager = new ModelManager();
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$modelManager->saveToFile($regression, $filepath);
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$restoredRegression = $modelManager->restoreFromFile($filepath);
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self::assertEquals($regression, $restoredRegression);
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self::assertEquals($predicted, $restoredRegression->predict($testSamples));
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}
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}
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