MCordingley\Regression\Algorithm\GradientDescent\Gradient\Regularized::gradient PHP Метод

    public function gradient(array $coefficients, array $features, float $outcome) : array
    {
        $gradient = [];
        $baseGradient = $this->gradient->gradient($coefficients, $features, $outcome);
        for ($i = 0; $i < count($baseGradient); $i++) {
            $penalty = $i || !$this->ignoreFirst ? $this->lambda * pow(abs($coefficients[$i]), $this->level - 1) : 0.0;
            $gradient[] = $baseGradient[$i] + $penalty;
        }
        return $gradient;
    }