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<?php declare(strict_types=1); namespace Phpml\NeuralNetwork\Node\Neuron; use Phpml\NeuralNetwork\Node; class Synapse { /** * @var float */ protected $weight; /** * @var Node */ protected $node; /** * @param float|null $weight */ public function __construct(Node $node, ?float $weight = null) { $this->node = $node; $this->weight = $weight ?? $this->generateRandomWeight(); } public function getOutput(): float { return $this->weight * $this->node->getOutput(); } public function changeWeight(float $delta): void { $this->weight += $delta; } public function getWeight(): float { return $this->weight; } public function getNode(): Node { return $this->node; } protected function generateRandomWeight(): float { return (1 / random_int(5, 25) * random_int(0, 1)) > 0 ? -1 : 1; } }
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