32 lines
814 B
PHP
32 lines
814 B
PHP
<?php
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declare(strict_types=1);
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namespace tests\Phpml\FeatureExtraction;
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use Phpml\FeatureExtraction\TfIdfTransformer;
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use PHPUnit\Framework\TestCase;
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class TfIdfTransformerTest extends TestCase
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{
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public function testTfIdfTransformation(): void
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{
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// https://en.wikipedia.org/wiki/Tf-idf
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$samples = [
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[0 => 1, 1 => 1, 2 => 2, 3 => 1, 4 => 0, 5 => 0],
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[0 => 1, 1 => 1, 2 => 0, 3 => 0, 4 => 2, 5 => 3],
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];
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$tfIdfSamples = [
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[0 => 0, 1 => 0, 2 => 0.602, 3 => 0.301, 4 => 0, 5 => 0],
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[0 => 0, 1 => 0, 2 => 0, 3 => 0, 4 => 0.602, 5 => 0.903],
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];
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$transformer = new TfIdfTransformer($samples);
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$transformer->transform($samples);
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$this->assertEquals($tfIdfSamples, $samples, '', 0.001);
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}
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}
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