private void UpdatedWeightPlus(double[] neuronPreviousWeightDerivatives, double[] neuronWeightDerivatives,
double[] neuronWeightUpdates, NeuronRProp neuron, int index)
{
int change = Sign(neuronPreviousWeightDerivatives[index] * neuronWeightDerivatives[index]);
if (change > 0)
{
double delta = neuronWeightUpdates[index] * EtaPlus;
delta = Math.Min(delta, DeltaMax);
neuronWeightUpdates[index] = delta;
neuron.Weights[index] -= Sign(neuronWeightDerivatives[index]) * delta;
neuronPreviousWeightDerivatives[index] = neuronWeightDerivatives[index];
}
else if (change < 0)
{
double delta = neuronWeightUpdates[index] * EtaMinus;
delta = Math.Max(delta, DeltaMin);
neuronWeightUpdates[index] = delta;
neuronPreviousWeightDerivatives[index] = 0;
}
else if (change == 0)
{
double delta = neuronWeightUpdates[index];
neuron.Weights[index] -= Sign(neuronWeightDerivatives[index]) * delta;
neuronPreviousWeightDerivatives[index] = neuronWeightDerivatives[index];
}
}
private void UpdateThresholdPlus(double[] layerPreviousThresholdDerivatives, double[] layerThresholdDerivatives,
double[] layerThresholdUpdates, NeuronRProp neuron, int index)
{
int change = Sign(layerPreviousThresholdDerivatives[index] * layerThresholdDerivatives[index]);
if (change > 0)
{
layerThresholdUpdates[index] = Math.Min(layerThresholdUpdates[index] * EtaPlus, DeltaMax);
neuron.Threshold -= Sign(layerThresholdDerivatives[index]) * layerThresholdUpdates[index];
layerPreviousThresholdDerivatives[index] = layerThresholdDerivatives[index];
}
else if (change < 0)
{
layerThresholdUpdates[index] = Math.Max(layerThresholdUpdates[index] * EtaMinus, DeltaMin);
layerThresholdDerivatives[index] = 0;
}
else if (change == 0)
{
neuron.Threshold -= Sign(layerThresholdDerivatives[index]) * layerThresholdUpdates[index];
layerPreviousThresholdDerivatives[index] = layerThresholdDerivatives[index];
}
}
