90 lines
1.8 KiB
C++
90 lines
1.8 KiB
C++
#include "Layer.h"
|
|
|
|
Layer::Layer(size_t numNeurons)
|
|
{
|
|
for (unsigned int i = 0; i < numNeurons; ++i)
|
|
{
|
|
push_back(Neuron());
|
|
}
|
|
}
|
|
|
|
void Layer::setOutputValues(const std::vector<double> & outputValues)
|
|
{
|
|
if (size() - 1 != outputValues.size())
|
|
{
|
|
throw std::exception("The number of output values has to match the layer size");
|
|
}
|
|
|
|
auto neuronIt = begin();
|
|
for (const double &value : outputValues)
|
|
{
|
|
(neuronIt++)->setOutputValue(value);
|
|
}
|
|
}
|
|
|
|
void Layer::feedForward(const Layer &inputLayer)
|
|
{
|
|
int neuronNumber = 0;
|
|
for (auto neuronIt = begin(); neuronIt != end(); ++neuronIt)
|
|
{
|
|
neuronIt->feedForward(inputLayer.getWeightedSum(neuronNumber++));
|
|
}
|
|
}
|
|
|
|
double Layer::getWeightedSum(int outputNeuron) const
|
|
{
|
|
double sum = 0.0;
|
|
|
|
for (const Neuron &neuron : *this)
|
|
{
|
|
sum += neuron.getWeightedOutputValue(outputNeuron);
|
|
}
|
|
|
|
return sum;
|
|
}
|
|
|
|
void Layer::connectTo(const Layer & nextLayer)
|
|
{
|
|
for (Neuron &neuron : *this)
|
|
{
|
|
neuron.createRandomOutputWeights(nextLayer.size());
|
|
}
|
|
}
|
|
|
|
void Layer::updateInputWeights(Layer & prevLayer)
|
|
{
|
|
static const double trainingRate = 0.5;
|
|
|
|
for (size_t currentLayerIndex = 0; currentLayerIndex < sizeWithoutBiasNeuron(); ++currentLayerIndex)
|
|
{
|
|
Neuron &targetNeuron = at(currentLayerIndex);
|
|
|
|
for (size_t prevLayerIndex = 0; prevLayerIndex < prevLayer.size(); ++prevLayerIndex)
|
|
{
|
|
Neuron &sourceNeuron = prevLayer.at(prevLayerIndex);
|
|
|
|
sourceNeuron.setOutputWeight(currentLayerIndex,
|
|
sourceNeuron.getOutputWeight(currentLayerIndex) +
|
|
sourceNeuron.getOutputValue() * targetNeuron.getGradient() * trainingRate);
|
|
}
|
|
}
|
|
}
|
|
|
|
void Layer::addBiasNeuron()
|
|
{
|
|
push_back(Neuron(1.0));
|
|
hasBiasNeuron = true;
|
|
}
|
|
|
|
size_t Layer::sizeWithoutBiasNeuron() const
|
|
{
|
|
if (hasBiasNeuron)
|
|
{
|
|
return size() - 1;
|
|
}
|
|
else
|
|
{
|
|
return size();
|
|
}
|
|
}
|