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<?php declare(strict_types=1); namespace Phpml\CrossValidation; use Phpml\Dataset\ArrayDataset; use Phpml\Dataset\Dataset; class StratifiedRandomSplit extends RandomSplit { protected function splitDataset(Dataset $dataset, float $testSize): void { $datasets = $this->splitByTarget($dataset); foreach ($datasets as $targetSet) { parent::splitDataset($targetSet, $testSize); } } /** * @return Dataset[] */ private function splitByTarget(Dataset $dataset): array { $targets = $dataset->getTargets(); $samples = $dataset->getSamples(); $uniqueTargets = array_unique($targets); /** @var array $split */ $split = array_combine($uniqueTargets, array_fill(0, count($uniqueTargets), [])); foreach ($samples as $key => $sample) { $split[$targets[$key]][] = $sample; } return $this->createDatasets($uniqueTargets, $split); } private function createDatasets(array $uniqueTargets, array $split): array { $datasets = []; foreach ($uniqueTargets as $target) { $datasets[$target] = new ArrayDataset($split[$target], array_fill(0, count($split[$target]), $target)); } return $datasets; } }
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