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<?php declare(strict_types=1); namespace Phpml\NeuralNetwork\ActivationFunction; use Phpml\NeuralNetwork\ActivationFunction; class ThresholdedReLU implements ActivationFunction { /** * @var float */ private $theta; public function __construct(float $theta = 0.0) { $this->theta = $theta; } /** * @param float|int $value */ public function compute($value): float { return $value > $this->theta ? $value : 0.0; } /** * @param float|int $value * @param float|int $calculatedvalue */ public function differentiate($value, $calculatedvalue): float { return $calculatedvalue >= $this->theta ? 1.0 : 0.0; } }
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