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<?php
declare(strict_types=1);
namespace Phpml\Math\Distance;
use Phpml\Exception\InvalidArgumentException;
use Phpml\Math\Distance as DistanceInterface;
/**
* Class Distance
*/
abstract class Distance implements DistanceInterface
{
* @var float|int
public $norm = 2;
* Distance constructor.
* @param float $norm
public function __construct(float $norm = 3.0)
$this->norm = $norm;
}
* @param array $a
* @param array $b
*
* @return float
* @throws InvalidArgumentException
public function distance(array $a, array $b): float
$norm = $this->norm;
return array_sum(
array_map(
function ($a) use ($norm) {
return $a**$norm;
},
$this->deltas($a, $b)
)
) ** (1 / $norm);
* @return array
protected function deltas(array $a, array $b): array
if (count($a) !== count($b)) {
throw new InvalidArgumentException('Size of given arrays does not match');
return array_map(
function ($a, $b) {
return abs($a - $b);
$a,
$b
);
php-ai /
php-ml
