TermStagnationOp.cpp

#include "ECF_base.h"
#include "TermStagnationOp.h"
#include <cmath>
 
 
void TermStagnationOp::registerParameters(StateP state)
{
    uint *value = new uint(50);
    state->getRegistry()->registerEntry("term.stagnation", (voidP) value, ECF::UINT,
        "max number of consecutive generations without improvement (default: 5000 / pop_size)");
}
 
 
bool TermStagnationOp::initialize(StateP state)
{
    voidP sptr = state->getRegistry()->getEntry("term.stagnation");
    termStagnation_ = *((uint*) sptr.get());
 
    // define the default criterion
    if(termStagnation_ == 0) {
        voidP sptr = state->getRegistry()->getEntry("population.size");
        uint demeSize = *((uint*) sptr.get());
        termStagnation_ = 5000 / demeSize;
        if(termStagnation_ < 10)
            termStagnation_ = 5;
        if(termStagnation_ > 200)
            termStagnation_ = 200;
    }
 
    if(!state->getRegistry()->isModified("term.stagnation"))
        return false;
 
    return true;
}
 
 
bool TermStagnationOp::operate(StateP state)
{
    uint currentGen = state->getGenerationNo();
    if(currentGen - state->getPopulation()->getHof()->getLastChange() > termStagnation_) {
        state->setTerminateCond();
        ECF_LOG(state, 1, "Termination: maximum number of generations without improvement ("
            + uint2str(termStagnation_) + ") reached");
    }
 
    return true;
}