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Hadrons: genetic pair selection based on exponential probability

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This commit is contained in:
Antonin Portelli 2017-12-03 19:47:40 +01:00
parent 59aae5f5ec
commit 01f00385a4
1 changed files with 14 additions and 19 deletions
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33
extras/Hadrons/GeneticScheduler.hpp
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@ -212,28 +212,23 @@ typename GeneticScheduler<T>::GenePair GeneticScheduler<T>::selectPair(void)
std::vector<double> prob;
unsigned int ind;
Gene *p1, *p2;
const double max = population_.rbegin()->first;
for (auto &c: population_)
{
prob.push_back(1./c.first);
}
do
{
double probCpy;
std::discrete_distribution<unsigned int> dis1(prob.begin(), prob.end());
auto rIt = population_.begin();
ind = dis1(gen_);
std::advance(rIt, ind);
p1 = &(rIt->second);
probCpy = prob[ind];
prob[ind] = 0.;
std::discrete_distribution<unsigned int> dis2(prob.begin(), prob.end());
rIt = population_.begin();
std::advance(rIt, dis2(gen_));
p2 = &(rIt->second);
prob[ind] = probCpy;
} while (p1 == p2);
prob.push_back(std::exp((c.first-1.)/max));
}
std::discrete_distribution<unsigned int> dis1(prob.begin(), prob.end());
auto rIt = population_.begin();
ind = dis1(gen_);
std::advance(rIt, ind);
p1 = &(rIt->second);
prob[ind] = 0.;
std::discrete_distribution<unsigned int> dis2(prob.begin(), prob.end());
rIt = population_.begin();
std::advance(rIt, dis2(gen_));
p2 = &(rIt->second);
return std::make_pair(p1, p2);
}