ec.cgp.problems
Class ProblemCGP

java.lang.Object
  ec.Problem
      ec.cgp.problems.ProblemCGP

All Implemented Interfaces:

ec.Prototype, ec.Setup, ec.simple.SimpleProblemForm, java.io.Serializable, java.lang.Cloneable

Direct Known Subclasses:

ClassificationProblem, ProblemParity, ProblemRegression

public abstract class ProblemCGP
extends ec.Problem
implements ec.simple.SimpleProblemForm

A CGP Problem. Provides a single-threaded setup hook that initializes static objects used during evaluation, and provides storage for constants.

Author:

David Oranchak, doranchak@gmail.com, http://oranchak.com

See Also:

Serialized Form

Field Summary

(package private) static float	constantMax open upper bound for generated constants
(package private) static float	constantMin closed lower bound for generated constants
(package private) static float[]	constants Constants randomly initialized at setup for some problems.
(package private) static int	numConstants number of constants to use
(package private) static java.lang.String	P_CONSTANT_MAX
(package private) static java.lang.String	P_CONSTANT_MIN
(package private) static java.lang.String	P_CONSTANTS

Fields inherited from class ec.Problem

P_PROBLEM

Constructor Summary

ProblemCGP()

Method Summary

void	describe(ec.Individual ind, ec.EvolutionState state, int subpopulation, int threadnum, int log, int verbosity) Currently does nothing except enforce the SimpleProblemForm contract.
(package private) void	initConstants(ec.EvolutionState state) Initialize the random constants once before this run.
void	setup(ec.EvolutionState state, ec.util.Parameter base) Initialize the evaluation cache, and configure the random constants.

Methods inherited from class ec.Problem

canEvaluate, clone, closeContacts, defaultBase, finishEvaluating, initializeContacts, prepareToEvaluate, reinitializeContacts

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface ec.simple.SimpleProblemForm

evaluate

Field Detail

constants

static float[] constants

Constants randomly initialized at setup for some problems. Once the constants are created, they are kept throughout the run.

numConstants

static int numConstants

number of constants to use

constantMin

static float constantMin

closed lower bound for generated constants

constantMax

static float constantMax

open upper bound for generated constants

P_CONSTANTS

static java.lang.String P_CONSTANTS

P_CONSTANT_MIN

static java.lang.String P_CONSTANT_MIN

P_CONSTANT_MAX

static java.lang.String P_CONSTANT_MAX

Constructor Detail

ProblemCGP

public ProblemCGP()

Method Detail

describe

public void describe(ec.Individual ind,
                     ec.EvolutionState state,
                     int subpopulation,
                     int threadnum,
                     int log,
                     int verbosity)

Currently does nothing except enforce the SimpleProblemForm contract.

Specified by:

describe in interface ec.simple.SimpleProblemForm

setup

public void setup(ec.EvolutionState state,
                  ec.util.Parameter base)

Initialize the evaluation cache, and configure the random constants.

Specified by:

setup in interface ec.Prototype

Specified by:

setup in interface ec.Setup

Overrides:

setup in class ec.Problem

initConstants

void initConstants(ec.EvolutionState state)

Initialize the random constants once before this run. Values are generated uniformly at random within the half-open range [constantMin, constantMax). The same constant values are used throughout this run.