/*!
* \brief Apply the operation on a deme in the given context.
* \param ioDeme Reference to the deme on which the operation takes place.
* \param ioContext Evolutionary context of the operation.
*/
void GenerationalOp::operate(Deme& ioDeme, Context& ioContext)
{
Beagle_StackTraceBeginM();
Beagle_NonNullPointerAssertM(getRootNode());
Beagle_NonNullPointerAssertM(mElitismKeepSize);
Beagle_ValidateParameterM(mElitismKeepSize->getWrappedValue() <= ioDeme.size(),
"ec.elite.keepsize",
"The elistism keepsize must be less than the deme size!");
Beagle_LogTraceM(
ioContext.getSystem().getLogger(),
"Processing using generational replacement strategy the " <<
uint2ordinal(ioContext.getDemeIndex()+1) << " deme"
);
Beagle_LogTraceM(ioContext.getSystem().getLogger(), (*this));
RouletteT<unsigned int> lRoulette;
buildRoulette(lRoulette, ioContext);
Individual::Bag lOffsprings;
const Factory& lFactory = ioContext.getSystem().getFactory();
if(mElitismKeepSize->getWrappedValue() > 0) {
History::Handle lHistory = castHandleT<History>(ioContext.getSystem().haveComponent("History"));
std::make_heap(ioDeme.begin(), ioDeme.end(), IsLessPointerPredicate());
for(unsigned int i=0; i<mElitismKeepSize->getWrappedValue(); ++i) {
std::string lIndividualType = ioDeme[0]->getType();
Individual::Alloc::Handle lIndividualAlloc =
castHandleT<Individual::Alloc>(lFactory.getAllocator(lIndividualType));
Individual::Handle lEliteIndiv = castHandleT<Individual>(lIndividualAlloc->allocate());
lEliteIndiv->copy(*ioDeme[0], ioContext.getSystem());
lOffsprings.push_back(lEliteIndiv);
if(lHistory != NULL) {
HistoryID::Handle lHID = castHandleT<HistoryID>(ioDeme[0]->getMember("HistoryID"));
std::vector<HistoryID> lParent;
if(lHID != NULL) lParent.push_back(*lHID);
lHistory->allocateNewID(*lEliteIndiv);
lHistory->trace(ioContext, lParent, lEliteIndiv, getName(), "elitism");
}
std::pop_heap(ioDeme.begin(), (ioDeme.end()-i), IsLessPointerPredicate());
}
}
for(unsigned int i=mElitismKeepSize->getWrappedValue(); i<ioDeme.size(); ++i) {
unsigned int lIndexBreeder = lRoulette.select(ioContext.getSystem().getRandomizer());
BreederNode::Handle lSelectedBreeder=getRootNode();
for(unsigned int j=0; j<lIndexBreeder; ++j)
lSelectedBreeder=lSelectedBreeder->getNextSibling();
Beagle_NonNullPointerAssertM(lSelectedBreeder);
Beagle_NonNullPointerAssertM(lSelectedBreeder->getBreederOp());
Individual::Handle lBredIndiv =
lSelectedBreeder->getBreederOp()->breed(ioDeme, lSelectedBreeder->getFirstChild(), ioContext);
Beagle_NonNullPointerAssertM(lBredIndiv);
lOffsprings.push_back(lBredIndiv);
}
for(unsigned int j=0; j<lOffsprings.size(); ++j) ioDeme[j] = lOffsprings[j];
Beagle_StackTraceEndM();
}
/*!
* \brief Apply NPGA2 multiobjective selection operator.
* \param ioDeme Deme on which selection operator is applied.
* \param ioContext Evolutionary context.
*/
void NPGA2Op::operate(Deme& ioDeme, Context& ioContext)
{
Beagle_StackTraceBeginM();
if(ioDeme.size() == 0) return;
Beagle_LogTraceM(
ioContext.getSystem().getLogger(),
std::string("Applying NPGA2 multiobjective selection on the ")+
uint2ordinal(ioContext.getDemeIndex()+1)+" deme"
);
std::vector<bool> lAlreadySelectedIndiv(ioDeme.size(), false);
Individual::Bag lSelectedIndividual;
const Factory& lFactory = ioContext.getSystem().getFactory();
// Generate new generation by selection
for(unsigned int i=0; i<ioDeme.size(); ++i) {
// First participant
unsigned int lFirstParticipant =
ioContext.getSystem().getRandomizer().rollInteger(0, ioDeme.size()-1);
std::vector<unsigned int> lNDParticipants(1, lFirstParticipant);
// Following participants to tournament
for(unsigned int j=1; j<mNumberParticipants->getWrappedValue(); ++j) {
unsigned int lParticipant =
ioContext.getSystem().getRandomizer().rollInteger(0, ioDeme.size()-1);
// Test if participant is dominated or dominate other participants
bool lIsDominated = false;
Fitness::Handle lPartFitness = ioDeme[lParticipant]->getFitness();
for(unsigned int k=0; k<lNDParticipants.size(); ++k) {
Fitness::Handle lFitnessNDk = ioDeme[lNDParticipants[k]]->getFitness();
if(lPartFitness->isDominated(*lFitnessNDk)) {
lIsDominated = true;
} else if(lFitnessNDk->isDominated(*lPartFitness)) {
lNDParticipants.erase(lNDParticipants.begin()+k);
}
}
if(lIsDominated==false) lNDParticipants.push_back(lParticipant);
}
// Test if there is a tie. If so evaluate niche count.
Beagle_AssertM(lNDParticipants.size() != 0);
unsigned int lWinner = lNDParticipants[0];
if(lNDParticipants.size() > 1) {
float lLowestNicheCount = evalNicheCount(*ioDeme[lNDParticipants[0]], lSelectedIndividual);
for(unsigned int j=1; j<lNDParticipants.size(); ++j) {
float lNicheCount = evalNicheCount(*ioDeme[lNDParticipants[j]], lSelectedIndividual);
if(lNicheCount < lLowestNicheCount) {
lLowestNicheCount = lNicheCount;
lWinner = lNDParticipants[j];
}
}
}
// Put winner in selected individual bag
if(lAlreadySelectedIndiv[lWinner]) {
std::string lIndividualType = ioDeme[lWinner]->getType();
Individual::Alloc::Handle lIndividualAlloc =
castHandleT<Individual::Alloc>(lFactory.getAllocator(lIndividualType));
Individual::Handle lIndividual = castHandleT<Individual>(lIndividualAlloc->allocate());
lIndividual->copy(*ioDeme[lWinner], ioContext.getSystem());
lSelectedIndividual.push_back(lIndividual);
Beagle_LogVerboseM(
ioContext.getSystem().getLogger(),
uint2ordinal(lWinner+1)+" individual selected again in NPGA2 selection process"
);
} else {
lSelectedIndividual.push_back(ioDeme[lWinner]);
lAlreadySelectedIndiv[lWinner] = true;
Beagle_LogVerboseM(
ioContext.getSystem().getLogger(),
uint2ordinal(lWinner+1)+" individual selected in NPGA2 selection process"
);
}
}
// Copy selected individuals into deme
for(unsigned int j=0; j<ioDeme.size(); ++j) ioDeme[j] = lSelectedIndividual[j];
Beagle_StackTraceEndM();
}
