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<?php |
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declare (strict_types = 1); |
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namespace Phpml\NeuralNetwork\Network; |
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use Phpml\Exception\InvalidArgumentException; |
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use Phpml\NeuralNetwork\Layer; |
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use Phpml\NeuralNetwork\Node\Bias; |
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use Phpml\NeuralNetwork\Node\Input; |
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use Phpml\NeuralNetwork\Node\Neuron; |
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use Phpml\NeuralNetwork\Node\Neuron\Synapse; |
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class MultilayerPerceptron extends LayeredNetwork |
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{ |
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/** |
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* @param array $layers |
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* |
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* @throws InvalidArgumentException |
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*/ |
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public function __construct(array $layers) |
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{ |
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if (count($layers) < 2) { |
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throw InvalidArgumentException::invalidLayersNumber(); |
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} |
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$this->addInputLayer(array_shift($layers)); |
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$this->addNeuronLayers($layers); |
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$this->addBiasNodes(); |
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$this->generateSynapses(); |
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} |
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/** |
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* @param int $nodes |
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*/ |
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private function addInputLayer(int $nodes) |
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{ |
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$this->addLayer(new Layer($nodes, Input::class)); |
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} |
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/** |
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* @param array $layers |
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*/ |
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private function addNeuronLayers(array $layers) |
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{ |
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foreach ($layers as $neurons) { |
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$this->addLayer(new Layer($neurons, Neuron::class)); |
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} |
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} |
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private function generateSynapses() |
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{ |
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$layersNumber = count($this->layers) - 1; |
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for ($i = 0; $i < $layersNumber; ++$i) { |
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$currentLayer = $this->layers[$i]; |
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$nextLayer = $this->layers[$i + 1]; |
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$this->generateLayerSynapses($nextLayer, $currentLayer); |
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} |
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} |
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private function addBiasNodes() |
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{ |
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$biasLayers = count($this->layers) - 1; |
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for ($i = 0;$i < $biasLayers;++$i) { |
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$this->layers[$i]->addNode(new Bias()); |
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} |
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} |
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/** |
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* @param Layer $nextLayer |
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* @param Layer $currentLayer |
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*/ |
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private function generateLayerSynapses(Layer $nextLayer, Layer $currentLayer) |
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{ |
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foreach ($nextLayer->getNodes() as $nextNeuron) { |
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if ($nextNeuron instanceof Neuron) { |
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$this->generateNeuronSynapses($currentLayer, $nextNeuron); |
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} |
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} |
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} |
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/** |
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* @param Layer $currentLayer |
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* @param Neuron $nextNeuron |
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*/ |
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private function generateNeuronSynapses(Layer $currentLayer, Neuron $nextNeuron) |
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{ |
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foreach ($currentLayer->getNodes() as $currentNeuron) { |
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$nextNeuron->addSynapse(new Synapse($currentNeuron)); |
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} |
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} |
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} |
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php-ai /
php-ml
