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<?php declare(strict_types=1); |
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namespace AlecRabbit\Tools; |
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use MathPHP\Exception\BadDataException; |
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use MathPHP\Exception\OutOfBoundsException; |
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use MathPHP\Statistics\Average; |
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use MathPHP\Statistics\RandomVariable; |
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class MeasurementsResults |
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{ |
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protected const REJECTION_THRESHOLD = 100; |
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/** |
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* @param array $measurements |
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* @param BenchmarkResult|null $previous |
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* @return BenchmarkResult |
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* @throws BadDataException |
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* @throws OutOfBoundsException |
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*/ |
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public static function createResult(array $measurements, ?BenchmarkResult $previous = null): BenchmarkResult |
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{ |
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$measurements = self::convertDataType($measurements); |
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$numberOfRejections = self::refine($measurements, $previous); |
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$numberOfMeasurements = count($measurements); |
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$mean = Average::mean($measurements); |
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$standardErrorOfTheMean = RandomVariable::standardErrorOfTheMean($measurements); |
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$tValue = TDistribution::tValue($numberOfMeasurements); |
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return |
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new BenchmarkResult( |
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$mean, |
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$standardErrorOfTheMean * $tValue, |
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$numberOfMeasurements, |
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$numberOfRejections |
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); |
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} |
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protected static function convertDataType(array $measurements): array |
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{ |
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if ($measurements[0] instanceof BenchmarkResult) { |
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$m = []; |
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/** @var BenchmarkResult $r */ |
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foreach ($measurements as $r) { |
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$m[] = $r->getMean(); |
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} |
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$measurements = $m; |
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} |
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return $measurements; |
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} |
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protected static function refine(array &$measurements, ?BenchmarkResult $previous = null): int |
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{ |
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self::removeMax($measurements); |
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$rejections = 0; |
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if ($previous instanceof BenchmarkResult) { |
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$meanThreshold = $previous->getMean() * self::rejectionCoefficient(); |
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} else { |
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$meanThreshold = Average::mean($measurements) * self::rejectionCoefficient(); |
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} |
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foreach ($measurements as $key => $value) { |
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if ($value > $meanThreshold) { |
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unset($measurements[$key]); |
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$rejections++; |
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} |
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} |
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return $rejections; |
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} |
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protected static function removeMax(array &$measurements): void |
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{ |
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$max = max($measurements); |
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unset($measurements[array_search($max, $measurements, true)]); |
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} |
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/** |
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* @return float|int |
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*/ |
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protected static function rejectionCoefficient() |
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{ |
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return 1 + self::REJECTION_THRESHOLD / 100; |
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} |
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} |
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alecrabbit /
php-simple-profiler
