138 lines
3.4 KiB
PHP
138 lines
3.4 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Phpml\Tests\Preprocessing;
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use Phpml\Exception\NormalizerException;
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use Phpml\Preprocessing\Normalizer;
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use PHPUnit\Framework\TestCase;
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class NormalizerTest extends TestCase
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{
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public function testThrowExceptionOnInvalidNorm(): void
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{
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$this->expectException(NormalizerException::class);
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new Normalizer(99);
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}
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public function testNormalizeSamplesWithL2Norm(): void
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{
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$samples = [
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[1, -1, 2],
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[2, 0, 0],
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[0, 1, -1],
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];
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$normalized = [
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[0.4, -0.4, 0.81],
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[1.0, 0.0, 0.0],
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[0.0, 0.7, -0.7],
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];
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$normalizer = new Normalizer();
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$normalizer->transform($samples);
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self::assertEqualsWithDelta($normalized, $samples, $delta = 0.01);
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}
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public function testNormalizeSamplesWithL1Norm(): void
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{
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$samples = [
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[1, -1, 2],
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[2, 0, 0],
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[0, 1, -1],
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];
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$normalized = [
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[0.25, -0.25, 0.5],
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[1.0, 0.0, 0.0],
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[0.0, 0.5, -0.5],
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];
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$normalizer = new Normalizer(Normalizer::NORM_L1);
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$normalizer->transform($samples);
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self::assertEqualsWithDelta($normalized, $samples, $delta = 0.01);
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}
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public function testFitNotChangeNormalizerBehavior(): void
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{
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$samples = [
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[1, -1, 2],
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[2, 0, 0],
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[0, 1, -1],
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];
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$normalized = [
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[0.4, -0.4, 0.81],
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[1.0, 0.0, 0.0],
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[0.0, 0.7, -0.7],
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];
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$normalizer = new Normalizer();
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$normalizer->transform($samples);
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self::assertEqualsWithDelta($normalized, $samples, $delta = 0.01);
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$normalizer->fit($samples);
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self::assertEqualsWithDelta($normalized, $samples, $delta = 0.01);
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}
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public function testL1NormWithZeroSumCondition(): void
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{
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$samples = [
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[0, 0, 0],
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[2, 0, 0],
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[0, 1, -1],
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];
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$normalized = [
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[0.33, 0.33, 0.33],
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[1.0, 0.0, 0.0],
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[0.0, 0.5, -0.5],
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];
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$normalizer = new Normalizer(Normalizer::NORM_L1);
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$normalizer->transform($samples);
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self::assertEqualsWithDelta($normalized, $samples, $delta = 0.01);
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}
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public function testStandardNorm(): void
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{
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// Generate 10 random vectors of length 3
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$samples = [];
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srand(time());
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for ($i = 0; $i < 10; ++$i) {
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$sample = array_fill(0, 3, 0);
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for ($k = 0; $k < 3; ++$k) {
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$sample[$k] = random_int(1, 100);
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}
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// Last feature's value shared across samples.
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$sample[] = 1;
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$samples[] = $sample;
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}
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// Use standard normalization
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$normalizer = new Normalizer(Normalizer::NORM_STD);
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$normalizer->transform($samples);
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// Values in the vector should be some value between -3 and +3
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self::assertCount(10, $samples);
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foreach ($samples as $sample) {
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$errors = array_filter(
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$sample,
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function ($element) {
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return $element < -3 || $element > 3;
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}
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);
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self::assertCount(0, $errors);
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self::assertEquals(0, $sample[3]);
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}
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}
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}
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