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<?php declare(strict_types=1); namespace Phpml\Preprocessing; final class ColumnFilter implements Preprocessor { /** * @var string[] */ private $datasetColumns = []; /** * @var string[] */ private $filterColumns = []; public function __construct(array $datasetColumns, array $filterColumns) { $this->datasetColumns = array_map(static function (string $column): string { return $column; }, $datasetColumns); $this->filterColumns = array_map(static function (string $column): string { return $column; }, $filterColumns); } public function fit(array $samples, ?array $targets = null): void { //nothing to do } public function transform(array &$samples, ?array &$targets = null): void { $keys = array_intersect($this->datasetColumns, $this->filterColumns); foreach ($samples as &$sample) { $sample = array_values(array_intersect_key($sample, $keys)); } } }
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