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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 Node $node
* @param float|null $weight
public function __construct(Node $node, float $weight = null)
$this->node = $node;
$this->weight = $weight ?: $this->generateRandomWeight();
}
* @return float
protected function generateRandomWeight(): float
return 1 / rand(5, 25) * (rand(0, 1) ? -1 : 1);
public function getOutput(): float
return $this->weight * $this->node->getOutput();
* @param float $delta
public function changeWeight($delta)
$this->weight += $delta;
public function getWeight()
return $this->weight;
* @return Node
public function getNode()
return $this->node;
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