/**
* @uses Neuron::setDelta()
* @uses Neuron::getWeight()
* @uses Neuron::getDelta()
* @uses Neuron::getOutput()
* @uses getNeurons()
*/
public function calculateHiddenDeltas()
{
$floatDelta = 0;
$floatSum = 0;
$arrNeuronsNextLayer = $this->objNextLayer->getNeurons();
/* @var $objNeuron Neuron */
foreach ($this->arrNeurons as $intKeyNeuron => $objNeuron) {
/* @var $objNeuronNextLayer Neuron */
foreach ($arrNeuronsNextLayer as $objNeuronNextLayer) {
$floatSum += $objNeuronNextLayer->getWeight($intKeyNeuron) * $objNeuronNextLayer->getDelta() * $this->objNetwork->floatMomentum;
}
$floatOutput = $objNeuron->getOutput();
$floatDelta = $floatOutput * (1 - $floatOutput) * $floatSum;
$objNeuron->setDelta($floatDelta);
}
}
/**
* @uses Layer::getNeurons()
* @uses Logging::logData()
* @uses Neuron::getWeights()
* @uses getNetworkError()
*/
protected function logWeights()
{
$arrData = array();
$arrData['E'] = $this->getNetworkError();
// ****** arrHiddenLayers ****************
foreach ($this->arrHiddenLayers as $intKeyLayer => $objHiddenLayer) {
$arrNeurons = $objHiddenLayer->getNeurons();
foreach ($arrNeurons as $intKeyNeuron => $objNeuron) {
foreach ($objNeuron->getWeights() as $intKeyWeight => $weight) {
$arrData["H{$intKeyLayer}-N{$intKeyNeuron}-W{$intKeyWeight}"] = round($weight, 5);
}
}
}
// ****** objOutputLayer *****************
$arrNeurons = $this->objOutputLayer->getNeurons();
foreach ($arrNeurons as $intKeyNeuron => $objNeuron) {
foreach ($objNeuron->getWeights() as $intKeyWeight => $weight) {
$arrData["O-N{$intKeyNeuron}-W{$intKeyWeight}"] = round($weight, 5);
}
}
// ************************************
$this->objLoggingWeights->logData($arrData);
}
