[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 BinaryStep implements ActivationFunction
  10  {
  11      /**
  12       * @param float|int $value
  13       */
  14      public function compute($value): float
  15      {
  16          return $value >= 0 ? 1.0 : 0.0;
  17      }
  18  
  19      /**
  20       * @param float|int $value
  21       * @param float|int $computedvalue
  22       */
  23      public function differentiate($value, $computedvalue): float
  24      {
  25          if ($value === 0 || $value === 0.0) {
  26              return 1;
  27          }
  28  
  29          return 0;
  30      }
  31  }