Documentation of 'ec.Evaluator' Java class
Evaluator
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Class Evaluator

  • All Implemented Interfaces:
    Setup, Singleton, java.io.Serializable
    Direct Known Subclasses:
    CompetitiveEvaluator, MultiPopCoevolutionaryEvaluator, SimpleEvaluator

    public abstract class Evaluator
extends java.lang.Object
implements Singleton
    An Evaluator is a singleton object which is responsible for the evaluation process during the course of an evolutionary run. Only one Evaluator is created in a run, and is stored in the EvolutionState object.

    Evaluators typically do their work by applying an instance of some subclass of Problem to individuals in the population. Evaluators come with a Problem prototype which they may clone as necessary to create new Problem spaces to evaluate individuals in (Problems may be reused to prevent constant cloning).

    Evaluators may be multithreaded, with one Problem instance per thread usually. The number of threads they may spawn (excepting a parent "gathering" thread) is governed by the EvolutionState's evalthreads value.

    Be careful about spawning threads -- this system has no few synchronized methods for efficiency's sake, so you must either divvy up evaluation in a thread-safe fashion, or otherwise you must obtain the appropriate locks on individuals in the population and other objects as necessary.

    Parameters

    base.problem
    classname, inherits and != ec.Problem    		 (the class for the Problem prototype p_problem)
    base.masterproblem
    classname, inherits    		 (the class for the MasterProblem prototype masterproblem)
    See Also:
    Serialized Form

    • Constructor Detail

      • Evaluator

        public Evaluator()

    • Method Detail

      • evaluatePopulation

        public abstract void evaluatePopulation(EvolutionState state)
        Evaluates the fitness of an entire population. You will have to determine how to handle multiple threads on your own, as this is a very domain-specific thing.

      • runComplete

        public abstract boolean runComplete(EvolutionState state)
        Returns true if an ideal individual has been found or some other run result has shortcircuited the run so that it should end prematurely right now.

      • setup

        public void setup(EvolutionState state,
                  Parameter base)
        Description copied from interface: Setup
        Sets up the object by reading it from the parameters stored in state, built off of the parameter base base. If an ancestor implements this method, be sure to call super.setup(state,base); before you do anything else.
        Specified by:
        setup in interface Setup

      • initializeContacts

        public void initializeContacts(EvolutionState state)
        Called to set up remote evaluation network contacts when the run is started. Mostly used for client/server evaluation (see MasterProblem). By default calls p_problem.initializeContacts(state)

      • reinitializeContacts

        public void reinitializeContacts(EvolutionState state)
        Called to reinitialize remote evaluation network contacts when the run is restarted from checkpoint. Mostly used for client/server evaluation (see MasterProblem). By default calls p_problem.reinitializeContacts(state)

      • closeContacts

        public void closeContacts(EvolutionState state,
                          int result)
        Called to shut down remote evaluation network contacts when the run is completed. Mostly used for client/server evaluation (see MasterProblem). By default calls p_problem.closeContacts(state,result)
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