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<?php declare(strict_types=1); namespace Phpml\NeuralNetwork\ActivationFunction; use Phpml\NeuralNetwork\ActivationFunction; class HyperbolicTangent implements ActivationFunction { /** * @var float */ private $beta; public function __construct(float $beta = 1.0) { $this->beta = $beta; } /** * @param float|int $value */ public function compute($value): float { return tanh($this->beta * $value); } /** * @param float|int $value * @param float|int $computedvalue */ public function differentiate($value, $computedvalue): float { return 1 - $computedvalue ** 2; } }
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