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Editing: Linear.php

<?php

namespace Rubix\ML\Kernels\SVM;

use Rubix\ML\Specifications\ExtensionIsLoaded;
use Rubix\ML\Specifications\SpecificationChain;
use Rubix\ML\Specifications\ExtensionMinimumVersion;
use svm;

/**
 * Linear
 *
 * A simple linear kernel computed by the dot product.
 *
 * @category    Machine Learning
 * @package     Rubix/ML
 * @author      Andrew DalPino
 */
class Linear implements Kernel
{
    public function __construct()
    {
        SpecificationChain::with([
            new ExtensionIsLoaded('svm'),
            new ExtensionMinimumVersion('svm', '0.2.0'),
        ])->check();
    }

/**
     * Return the options for the libsvm runtime.
     *
     * @internal
     *
     * @return mixed[]
     */
    public function options() : array
    {
        return [
            svm::OPT_KERNEL_TYPE => svm::KERNEL_LINEAR,
        ];
    }

/**
     * Return the string representation of the object.
     *
     * @internal
     *
     * @return string
     */
    public function __toString() : string
    {
        return 'Linear';
    }
}

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