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#include "brain/neural_network.h"
#include "brain/neuron.h"
#include <limits>
NeuralNetwork::NeuralNetwork(std::istream &&networkConfigFile, int numberOfSensors, int numberOfOutputs)
{
_biasNode = std::make_shared<BiasNode>();
for (int i=0; i<numberOfSensors; ++i)
{
_sensors[i] = std::make_shared<Sensor>();
}
for (int i=0; i<numberOfOutputs; ++i)
{
auto output = std::make_shared<Neuron>();
_outputs.push_back(output);
_neurons[i] = output;
}
parseFile(std::move(networkConfigFile));
}
NeuralNetwork::NeuralNetwork(std::istream &&networkConfigFile, std::vector<bool> sensorInitialValues, int numberOfOutputs)
{
_biasNode = std::make_shared<BiasNode>();
for (unsigned int i=0; i<sensorInitialValues.size(); ++i)
{
auto sensor = std::make_shared<Sensor>();
sensor->setActivation(sensorInitialValues[i] ? 1 : 0);
_sensors[i] = sensor;
}
for (int i=0; i<numberOfOutputs; ++i)
{
auto output = std::make_shared<Neuron>();
_outputs.push_back(output);
_neurons[i] = output;
}
parseFile(std::move(networkConfigFile));
}
void NeuralNetwork::parseFile(std::istream &&file)
{
double weight;
char srcType;
int srcId;
int destId;
while (file.get(srcType) &&
file >> srcId &&
file.ignore(std::numeric_limits<std::streamsize>::max(), 'n') &&
file >> destId &&
file >> weight &&
file.ignore(std::numeric_limits<std::streamsize>::max(), '\n'))
{
std::shared_ptr<NeuralNode> source;
std::shared_ptr<Neuron> destination;
switch (srcType)
{
case 's':
source = findOrAddSensor(srcId);
break;
case 'b':
source = _biasNode;
break;
default:
source = findOrAddNeuron(srcId);
}
destination = findOrAddNeuron(destId);
addLink(source, destination, weight);
}
}
void NeuralNetwork::addLink(std::shared_ptr<NeuralNode> source, std::shared_ptr<Neuron> destination, double weight)
{
std::unique_ptr<NeuralLink> link(new NeuralLink(source, weight));
destination->addInput(std::move(link));
}
std::shared_ptr<Sensor> NeuralNetwork::findOrAddSensor(int id)
{
auto sensor = _sensors[id];
if (!sensor)
{
sensor = std::make_shared<Sensor>();
_sensors[id] = sensor;
}
return sensor;
}
std::shared_ptr<Neuron> NeuralNetwork::findOrAddNeuron(int id)
{
auto neuron = _neurons[id];
if (!neuron)
{
neuron = std::make_shared<Neuron>();
_neurons[id] = neuron;
}
return neuron;
}
void NeuralNetwork::setInput(int inputIndex, double activation)
{
_sensors.at(inputIndex)->setActivation(activation);
}
int NeuralNetwork::findMaxOutputIndex() const
{
bool anyNodeChanged = true;
for (unsigned int iteration=0; anyNodeChanged && iteration<_neurons.size()*10; ++iteration)
{
anyNodeChanged = false;
for (auto const& neuron : _neurons)
{
neuron.second->calculateActivation();
if (neuron.second->activationChanged())
{
anyNodeChanged = true;
}
}
}
int currentMaxIndex = 0;
double currentMaxActivation = _outputs[0]->activation();
for (unsigned int i=1; i<_outputs.size(); ++i)
{
double activation = _outputs[i]->activation();
if (activation >= currentMaxActivation)
{
currentMaxActivation = activation;
currentMaxIndex = i;
}
}
return currentMaxIndex;
}
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