Package ec.gp

Class GPNodeConstraints

java.lang.Object
ec.gp.GPNodeConstraints
All Implemented Interfaces:
Clique, Setup, Serializable
public class GPNodeConstraints extends 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:

  • Field Details

    • SIZE_OF_BYTE

      public static final int SIZE_OF_BYTE
      See Also:

    • P_NAME

      public static final String P_NAME
      See Also:

    • P_RETURNS

      public static final String P_RETURNS
      See Also:

    • P_CHILD

      public static final String P_CHILD
      See Also:

    • P_SIZE

      public static final String P_SIZE
      See Also:

    • P_PROBABILITY

      public static final String P_PROBABILITY
      See Also:

    • DEFAULT_PROBABILITY

      public static final double DEFAULT_PROBABILITY
      See Also:

    • 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 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 Details

    • GPNodeConstraints

      public GPNodeConstraints()

  • Method Details

    • toString

      public String toString()
      Overrides:
      toString in class 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(String constraintsName, EvolutionState state)
      You must guarantee that after calling constraintsFor(...) one or several times, you call state.output.exitIfErrors() once.