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<?php declare(strict_types=1); namespace Phpml\Metric; use Phpml\Exception\InvalidArgumentException; class Accuracy { /** * @return float|int * * @throws InvalidArgumentException */ public static function score(array $actualLabels, array $predictedLabels, bool $normalize = true) { if (count($actualLabels) != count($predictedLabels)) { throw new InvalidArgumentException('Size of given arrays does not match'); } $score = 0; foreach ($actualLabels as $index => $label) { if ($label == $predictedLabels[$index]) { ++$score; } } if ($normalize) { $score /= count($actualLabels); } return $score; } }
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