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#include "brain/neuron.h"
#include <cmath>
double Neuron::sigmoid(double input) const
{
const double slope = 4.924273;
return (1/(1+(std::exp(-(slope*input)))));
}
bool Neuron::calculateActivation()
{
double newActivation = 0;
for (auto const& link : _inputLinks)
{
newActivation += link.weightedActivation();
}
newActivation = sigmoid(newActivation);
const double errorMargin = 0.000001;
bool activationChanged = std::abs(newActivation - _activation) > errorMargin;
_activation = newActivation;
return activationChanged;
}
void Neuron::addInput(NeuralLink&& link)
{
_inputLinks.push_back(std::move(link));
}
bool Neuron::hasInputWithWeight(std::string srcIdentifier, double weight) const
{
for (auto const& link : _inputLinks)
{
if (link.inputIdentifier() == srcIdentifier && link.weight() == weight)
{
return true;
}
}
return false;
}
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