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<?php
declare(strict_types=1);
namespace Phpml\Math\Kernel;
use Phpml\Exception\InvalidArgumentException;
use Phpml\Math\Kernel;
use Phpml\Math\Product;
class RBF implements Kernel
{
/**
* @var float
*/
private $gamma;
public function __construct(float $gamma)
{
$this->gamma = $gamma;
}
public function compute($a, $b): float
{
if (!is_array($a) || !is_array($b)) {
throw new InvalidArgumentException(sprintf('Arguments of %s must be arrays', __METHOD__));
}
$score = 2 * Product::scalar($a, $b);
$squares = Product::scalar($a, $a) + Product::scalar($b, $b);
return exp(-$this->gamma * ($squares - $score));
}
}
| Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| RBF.php | File | 723 B | 0777 |
|