65 lines
1.7 KiB
PHP
65 lines
1.7 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\FuzzyCMeans;
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use Phpml\Exception\InvalidArgumentException;
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use PHPUnit\Framework\TestCase;
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class FuzzyCMeansTest extends TestCase
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{
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public function testFCMSamplesClustering(): void
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{
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$samples = [[1, 1], [8, 7], [1, 2], [7, 8], [2, 1], [8, 9]];
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$fcm = new FuzzyCMeans(2);
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$clusters = $fcm->cluster($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, $samples);
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}
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public function testMembershipMatrix(): void
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{
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$fcm = new FuzzyCMeans(2);
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$fcm->cluster([[1, 1], [8, 7], [1, 2], [7, 8], [2, 1], [8, 9]]);
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$clusterCount = 2;
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$sampleCount = 6;
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$matrix = $fcm->getMembershipMatrix();
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self::assertCount($clusterCount, $matrix);
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foreach ($matrix as $row) {
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self::assertCount($sampleCount, $row);
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}
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// Transpose of the matrix
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array_unshift($matrix, null);
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$matrix = array_map(...$matrix);
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// All column totals should be equal to 1 (100% membership)
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foreach ($matrix as $col) {
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self::assertEquals(1, array_sum($col));
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}
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}
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/**
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* @dataProvider invalidClusterNumberProvider
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*/
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public function testInvalidClusterNumber(int $clusters): void
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{
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$this->expectException(InvalidArgumentException::class);
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new FuzzyCMeans($clusters);
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}
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public function invalidClusterNumberProvider(): array
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{
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return [[0], [-1]];
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}
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}
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