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#include "NNUtils.hpp"
std::default_random_engine rGenerator;
void seedRand()
{
rGenerator.seed(std::chrono::system_clock::now().time_since_epoch().count());
}
float realRand(float low, float hi)
{
std::uniform_real_distribution<float> fDistributor(low, hi);
return fDistributor(rGenerator);
}
int intRand(int low, int hi)
{
std::uniform_int_distribution<int> iDistributor(low, hi - 1);
return iDistributor(rGenerator);
}
float sigmoid(float input, float sensitivity)
{
return 1.f / (1.f + expf(-input / sensitivity));
}
void crossover(const Chromosome &parent, const Chromosome &mother, Chromosome &child1, Chromosome &child2)
{
if (parent.size() != mother.size())
{
return;
}
child1.clear();
child2.clear();
int cop = intRand(0, parent.size());
child1.insert(child1.end(), parent.begin(), parent.begin() + cop);
child1.insert(child1.end(), mother.begin() + cop, mother.end());
child2.insert(child2.end(), mother.begin(), mother.begin() + cop);
child2.insert(child2.end(), parent.begin() + cop, parent.end());
}
void mutate(Chromosome &chromosome, float mutationRate)
{
for (auto &i : chromosome)
{
if (realRand(0.f, 1.f) < mutationRate)
{
i = realRand(-1.f, 1.f);
}
}
}
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