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Editing: CrossValidate.php

<?php

namespace Rubix\ML\Backends\Tasks;

use Rubix\ML\Learner;
use Rubix\ML\Datasets\Labeled;
use Rubix\ML\CrossValidation\Validator;
use Rubix\ML\CrossValidation\Metrics\Metric;

/**
 * Cross Validate
 *
 * @internal
 *
 * @category    Machine Learning
 * @package     Rubix/ML
 * @author      Andrew DalPino
 */
class CrossValidate extends Task
{
    /**
     * Cross validate a learner with a given dataset and return the score.
     *
     * @param Learner $estimator
     * @param Labeled $dataset
     * @param Validator $validator
     * @param Metric $metric
     * @return float
     */
    public static function score(
        Learner $estimator,
        Labeled $dataset,
        Validator $validator,
        Metric $metric
    ) : float {
        return $validator->test($estimator, $dataset, $metric);
    }

/**
     * @param Learner $estimator
     * @param Labeled $dataset
     * @param Validator $validator
     * @param Metric $metric
     */
    public function __construct(
        Learner $estimator,
        Labeled $dataset,
        Validator $validator,
        Metric $metric
    ) {
        parent::__construct([self::class, 'score'], [
            $estimator, $dataset, $validator, $metric,
        ]);
    }
}

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