Examples of ec.Population

A Population is the repository for all the Individuals being bred or evaluated in the evolutionary run at a given time. A Population is basically an array of Subpopulations, each of which are arrays of Individuals coupled with a single Species per Subpoulation.

The first Population is created using the initializePopulation method of the Initializer object, which typically calls the Population's populate() method in turn. On generational systems, subsequent populations are created on a generation-by-generation basis by the Breeder object, replacing the previous Population.

In a multithreaded area of a run, Populations should be considered immutable. That is, once they are created, they should not be modified, nor anything they contain. This protocol helps ensure read-safety under multithreading race conditions.

Parameters

base.`subpops` int >= 1	(the number of subpopulations)
base.`subpop`.n classname, inherits or = ec.Subpopulation	(the class for subpopulation #n)
base.`default-subpop` int >= 0	(the default subpopulation index. The parameter base of this subpopulation will be used as the default base for all subpopulations which do not define one themselves./tr>

Parameter bases

base.subpop.n Subpopulation #n.

@author Sean Luke @version 1.0

    /** A simple breeder that doesn't attempt to do any cross-
        population breeding.  Basically it applies pipelines,
        one per thread, to various subchunks of a new population. */
    public Population breedPopulation(EvolutionState state) 
        {
        Population newpop = null;
        if (clonePipelineAndPopulation)
            newpop = (Population) state.population.emptyClone();
        else
            {
            if (backupPopulation == null)
                backupPopulation = (Population) state.population.emptyClone();
            newpop = backupPopulation;
            newpop.clear();
            backupPopulation = state.population;  // swap in
            }
        
        // load elites into top of newpop
        loadElites(state, newpop);

        Obviously, this is an expensive method.  It should only
        be called once typically in a run. */


    public Population initialPopulation(final EvolutionState state, int thread)
        {
        Population p = setupPopulation(state, thread); 
        p.populate(state, thread);
        return p;
        }

        }
                
    public Population setupPopulation(final EvolutionState state, int thread)
        {
        Parameter base = new Parameter(P_POP);
        Population p = (Population) state.parameters.getInstanceForParameterEq(base,null,Population.class);  // Population.class is fine
        p.setup(state,base);
        return p;
        }

Examples of ec.Population

Related Classes of ec.Population