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<?php
declare(strict_types=1);
namespace Phpml\NeuralNetwork\ActivationFunction;
use Phpml\NeuralNetwork\ActivationFunction;
class Sigmoid implements ActivationFunction
{
/**
* @var float
*/
private $beta;
public function __construct(float $beta = 1.0)
$this->beta = $beta;
}
* @param float|int $value
public function compute($value): float
return 1 / (1 + exp(-$this->beta * $value));
* @param float|int $computedvalue
public function differentiate($value, $computedvalue): float
return $computedvalue * (1 - $computedvalue);
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php-ml
