ec.app.regression

Class Regression

java.lang.Object

ec.Problem

ec.gp.GPProblem

ec.app.regression.Regression

All Implemented Interfaces:

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

Direct Known Subclasses:

Quintic, Sextic

public class Regression
extends GPProblem
implements SimpleProblemForm

Regression implements the Koza (quartic) Symbolic Regression problem.

The equation to be regressed is y = x^4 + x^3 + x^2 + x, {x in [-1,1]}

This equation was introduced in J. R. Koza, GP II, 1994.

Parameters

base.data classname, inherits or == ec.app.regression.RegressionData	(the class for the prototypical GPData object for the Regression problem)
base.size int >= 1	(the size of the training set)

Parameter bases

base.data

species (the GPData object)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
double	currentValue
double[]	inputs
double[]	outputs
static java.lang.String	P_FILE
static java.lang.String	P_SIZE
static java.lang.String	P_USE_FUNCTION
int	trainingSetSize
boolean	useFunction

Fields inherited from class ec.gp.GPProblem

input, P_DATA, P_GPPROBLEM, P_STACK, stack

Fields inherited from class ec.Problem

P_PROBLEM

Constructor Summary

Constructors

Constructor and Description
Regression()

Method Summary

Modifier and Type	Method and Description
void	evaluate(EvolutionState state, Individual ind, int subpopulation, int threadnum) Evaluates the individual in ind, if necessary (perhaps not evaluating them if their evaluated flags are true), and sets their fitness appropriately.
double	func(double x)
void	setup(EvolutionState state, Parameter base) Sets up the object by reading it from the parameters stored in state, built off of the parameter base base.

Methods inherited from class ec.gp.GPProblem

clone, defaultBase

Methods inherited from class ec.Problem

canEvaluate, closeContacts, describe, describe, finishEvaluating, initializeContacts, prepareToEvaluate, reinitializeContacts

Methods inherited from class java.lang.Object

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

Methods inherited from interface ec.simple.SimpleProblemForm

describe

Field Detail

P_SIZE

public static final java.lang.String P_SIZE

See Also:

Constant Field Values

P_FILE

public static final java.lang.String P_FILE

See Also:

Constant Field Values

P_USE_FUNCTION

public static final java.lang.String P_USE_FUNCTION

See Also:

Constant Field Values

currentValue

public double currentValue

trainingSetSize

public int trainingSetSize

useFunction

public boolean useFunction

inputs

public double[] inputs

outputs

public double[] outputs

Constructor Detail

Regression

public Regression()

Method Detail

func

public double func(double x)

setup

public void setup(EvolutionState state,
                  Parameter base)

Description copied from interface: Prototype

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.

For prototypes, setup(...) is typically called once for the prototype instance; cloned instances do not receive the setup(...) call. setup(...) may be called more than once; the only guarantee is that it will get called at least once on an instance or some "parent" object from which it was ultimately cloned.

Specified by:

setup in interface Prototype

Specified by:

setup in interface Setup

Overrides:

setup in class GPProblem

evaluate

public void evaluate(EvolutionState state,
                     Individual ind,
                     int subpopulation,
                     int threadnum)

Description copied from interface: SimpleProblemForm

Evaluates the individual in ind, if necessary (perhaps not evaluating them if their evaluated flags are true), and sets their fitness appropriately.

Specified by:

evaluate in interface SimpleProblemForm