[Summary view]

   1  <?php
   2  
   3  declare(strict_types=1);
   4  
   5  namespace Phpml\NeuralNetwork\ActivationFunction;
   6  
   7  use Phpml\NeuralNetwork\ActivationFunction;
   8  
   9  class Gaussian implements ActivationFunction
  10  {
  11      /**
  12       * @param float|int $value
  13       */
  14      public function compute($value): float
  15      {
  16          return exp(- $value ** 2);
  17      }
  18  
  19      /**
  20       * @param float|int $value
  21       * @param float|int $calculatedvalue
  22       */
  23      public function differentiate($value, $calculatedvalue): float
  24      {
  25          return -2 * $value * $calculatedvalue;
  26      }
  27  }