28 lines
530 B
PHP
28 lines
530 B
PHP
<?php
|
|
|
|
declare(strict_types=1);
|
|
|
|
namespace Phpml\NeuralNetwork\ActivationFunction;
|
|
|
|
use Phpml\NeuralNetwork\ActivationFunction;
|
|
|
|
class Gaussian implements ActivationFunction
|
|
{
|
|
/**
|
|
* @param float|int $value
|
|
*/
|
|
public function compute($value): float
|
|
{
|
|
return exp(- $value ** 2);
|
|
}
|
|
|
|
/**
|
|
* @param float|int $value
|
|
* @param float|int $calculatedvalue
|
|
*/
|
|
public function differentiate($value, $calculatedvalue): float
|
|
{
|
|
return -2 * $value * $calculatedvalue;
|
|
}
|
|
}
|