Package ec.gp.build

# Class RandomBranch

java.lang.Object
ec.gp.GPNodeBuilder
ec.gp.build.RandomBranch

All Implemented Interfaces:
  `Prototype`, `Setup`, `Serializable`, `Cloneable`

public class RandomBranch extends GPNodeBuilder
RandomBranch implements the `Random_Branch` tree generation method described in

Chellapilla, K. 1998. Evolving Modular Programs without Crossover. in Proceedings of the Third Annual Genetic Programming Conference (GP98), J.R. Koza et al, editors. San Fransisco: Morgan Kaufmann. 23--31.

This algorithm attempts to create a tree of size `requestedSize`, or "slightly less". If the pipeline does not specify a size it wants (it uses `NOSIZEGIVEN`), the algorithm picks a size at random from either [minSize...maxSize] or from sizeDistribution (one of the two must be defined), and attempts to create a tree of that size or "slightly less".

See Also:
  - Serialized Form

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `P_RANDOMBRANCH`

  ### Fields inherited from class ec.gp.GPNodeBuilder

  `CHECK_BOUNDARY, maxSize, minSize, NOSIZEGIVEN, P_MAXSIZE, P_MINSIZE, P_NUMSIZES, P_SIZE, sizeDistribution`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `RandomBranch()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `Parameter`
  `defaultBase()`
  Returns the default base for this prototype.
  `GPNode`
  `newRootedTree(EvolutionState state, GPType type, int thread, GPNodeParent parent, GPFunctionSet set, int argposition, int requestedSize)`
  `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.GPNodeBuilder

  `canPick, clone, errorAboutNoNodeWithType, pickSize, warnAboutNonterminal, warnAboutNonTerminalWithType, warnAboutNoTerminalWithType`

  ### Methods inherited from class java.lang.Object

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

- ## Field Details

  - ### P_RANDOMBRANCH

    public static final String P_RANDOMBRANCH
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### RandomBranch

    public RandomBranch()

- ## Method Details

  - ### defaultBase

    public Parameter defaultBase()
    Description copied from interface: `Prototype`
    Returns the default base for this prototype. This should generally be implemented by building off of the static base() method on the DefaultsForm object for the prototype's package. This should be callable during setup(...).

  - ### 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 `GPNodeBuilder`

  - ### newRootedTree

    public GPNode newRootedTree(EvolutionState state, GPType type, int thread, GPNodeParent parent, GPFunctionSet set, int argposition, int requestedSize)
    Specified by:
      `newRootedTree` in class `GPNodeBuilder`