87 lines
2.7 KiB
PHP
87 lines
2.7 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Phpml\Tests\Clustering;
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use Phpml\Clustering\KMeans;
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use Phpml\Exception\InvalidArgumentException;
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use PHPUnit\Framework\TestCase;
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class KMeansTest extends TestCase
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{
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public function testKMeansSamplesClustering(): void
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{
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$samples = [[1, 1], [8, 7], [1, 2], [7, 8], [2, 1], [8, 9]];
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$kmeans = new KMeans(2);
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$clusters = $kmeans->cluster($samples);
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self::assertCount(2, $clusters);
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foreach ($samples as $index => $sample) {
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if (in_array($sample, $clusters[0], true) || in_array($sample, $clusters[1], true)) {
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unset($samples[$index]);
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}
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}
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self::assertCount(0, $samples);
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}
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public function testKMeansSamplesLabeledClustering(): void
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{
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$samples = [
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'555' => [1, 1],
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'666' => [8, 7],
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'ABC' => [1, 2],
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'DEF' => [7, 8],
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668 => [2, 1],
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[8, 9],
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];
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$kmeans = new KMeans(2);
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$clusters = $kmeans->cluster($samples);
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self::assertCount(2, $clusters);
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foreach ($samples as $index => $sample) {
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if (in_array($sample, $clusters[0], true) || in_array($sample, $clusters[1], true)) {
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self::assertArrayHasKey($index, $clusters[0] + $clusters[1]);
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unset($samples[$index]);
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}
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}
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self::assertCount(0, $samples);
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}
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public function testKMeansInitializationMethods(): void
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{
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$samples = [
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[180, 155], [186, 159], [119, 185], [141, 147], [157, 158],
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[176, 122], [194, 160], [113, 193], [190, 148], [152, 154],
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[162, 146], [188, 144], [185, 124], [163, 114], [151, 140],
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[175, 131], [186, 162], [181, 195], [147, 122], [143, 195],
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[171, 119], [117, 165], [169, 121], [159, 160], [159, 112],
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[115, 122], [149, 193], [156, 135], [118, 120], [139, 159],
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[150, 115], [181, 136], [167, 162], [132, 115], [175, 165],
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[110, 147], [175, 118], [113, 145], [130, 162], [195, 179],
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[164, 111], [192, 114], [194, 149], [139, 113], [160, 168],
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[162, 110], [174, 144], [137, 142], [197, 160], [147, 173],
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];
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$kmeans = new KMeans(4, KMeans::INIT_KMEANS_PLUS_PLUS);
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$clusters = $kmeans->cluster($samples);
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self::assertCount(4, $clusters);
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$kmeans = new KMeans(4, KMeans::INIT_RANDOM);
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$clusters = $kmeans->cluster($samples);
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self::assertCount(4, $clusters);
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}
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public function testThrowExceptionOnInvalidClusterNumber(): void
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{
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$this->expectException(InvalidArgumentException::class);
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new KMeans(0);
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}
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}
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