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