php-ml/src/Phpml/NeuralNetwork/ActivationFunction/Gaussian.php

<?php

declare (strict_types = 1);

namespace Phpml\NeuralNetwork\ActivationFunction;

use Phpml\NeuralNetwork\ActivationFunction;

class Gaussian implements ActivationFunction
{
    /**
     * @param float|int $value
     *
     * @return float
     */
    public function compute($value): float
    {
        return exp(-pow($value, 2));
    }
}