ec.gp

Class GPNodeConstraints

java.lang.Object

ec.gp.GPNodeConstraints

All Implemented Interfaces:

Clique, Setup, java.io.Serializable

public class GPNodeConstraints
extends java.lang.Object
implements Clique

A GPNodeConstraints is a Clique which defines constraint information common to many different GPNode functions, namely return types, child types, and number of children. GPNodeConstraints have unique names by which they are identified.

In adding new things to GPNodeConstraints, you should ask yourself the following questions: first, is this something that takes up too much memory to store in GPNodes themselves? second, is this something that needs to be accessed very rapidly, so cannot be implemented as a method call in a GPNode? third, can this be shared among different GPNodes, even ones representing different functions?

Parameters

base.size int >= 1	(number of node constraints)
base.n.name String	(name of node constraint n)
base.n.returns String	(return type for node constraint n)
base.n.size int >= 1	(number of child arguments for node constraint n)
base.n.child.m String	(name of type for child argument m of node constraint n)
base.prob double >= 0.0	(auxillary probability of selection -- used by ec.gp.build.PTC1 and ec.gp.build.PTC2)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
GPType[]	childtypes The children types for a GPNode
byte	constraintNumber The byte value of the constraints -- we can only have 256 of them
static double	DEFAULT_PROBABILITY
java.lang.String	name The name of the GPNodeConstraints object -- this is NOT the name of the GPNode
static java.lang.String	P_CHILD
static java.lang.String	P_NAME
static java.lang.String	P_PROBABILITY
static java.lang.String	P_RETURNS
static java.lang.String	P_SIZE
double	probabilityOfSelection Probability of selection -- an auxillary measure mostly used by PTC1/PTC2 right now
GPType	returntype The return type for a GPNode
static int	SIZE_OF_BYTE
GPNode[]	zeroChildren A little memory optimization: if GPNodes have no children, they are welcome to use share this zero-sized array as their children array.

Constructor Summary

Constructors

Constructor and Description
GPNodeConstraints()

Method Summary

Modifier and Type	Method and Description
static GPNodeConstraints	constraintsFor(java.lang.String constraintsName, EvolutionState state) You must guarantee that after calling constraintsFor(...) one or several times, you call state.output.exitIfErrors() once.
void	setup(EvolutionState state, Parameter base) This must be called after the GPTypes have been set up.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

SIZE_OF_BYTE

public static final int SIZE_OF_BYTE

See Also:

Constant Field Values

P_NAME

public static final java.lang.String P_NAME

See Also:

Constant Field Values

P_RETURNS

public static final java.lang.String P_RETURNS

See Also:

Constant Field Values

P_CHILD

public static final java.lang.String P_CHILD

See Also:

Constant Field Values

P_SIZE

public static final java.lang.String P_SIZE

See Also:

Constant Field Values

P_PROBABILITY

public static final java.lang.String P_PROBABILITY

See Also:

Constant Field Values

DEFAULT_PROBABILITY

public static final double DEFAULT_PROBABILITY

See Also:

Constant Field Values

probabilityOfSelection

public double probabilityOfSelection

Probability of selection -- an auxillary measure mostly used by PTC1/PTC2 right now

constraintNumber

public byte constraintNumber

The byte value of the constraints -- we can only have 256 of them

returntype

public GPType returntype

The return type for a GPNode

childtypes

public GPType[] childtypes

The children types for a GPNode

name

public java.lang.String name

The name of the GPNodeConstraints object -- this is NOT the name of the GPNode

zeroChildren

public GPNode[] zeroChildren

A little memory optimization: if GPNodes have no children, they are welcome to use share this zero-sized array as their children array.

Constructor Detail

GPNodeConstraints

public GPNodeConstraints()

Method Detail

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

setup

public void setup(EvolutionState state,
                  Parameter base)

This must be called after the GPTypes have been set up.

Specified by:

setup in interface Setup

constraintsFor

public static GPNodeConstraints constraintsFor(java.lang.String constraintsName,
                                               EvolutionState state)

You must guarantee that after calling constraintsFor(...) one or several times, you call state.output.exitIfErrors() once.