php-ai / php-ml

        $vectors = new Matrix($vectors);

        $vectors = array_map(function ($vect) {

            $sum = 0;

            for ($i = 0; $i < count($vect); ++$i) {

                $sum += $vect[$i] ** 2;

            }

            $sum = sqrt($sum);

            for ($i = 0; $i < count($vect); ++$i) {

            }

            $sum = sqrt($sum);

            for ($i = 0; $i < count($vect); ++$i) {

                $vect[$i] /= $sum;

            }

            return $vect;

        }, $vectors->transpose()->toArray());