Package ec.gp

Class GPProblem

java.lang.Object
ec.Problem
ec.gp.GPProblem
All Implemented Interfaces:
Prototype, Setup, SimpleProblemForm, Serializable, Cloneable
Direct Known Subclasses:
PushProblem
public abstract class GPProblem extends Problem implements SimpleProblemForm
A GPProblem is a Problem which is meant to efficiently handle GP evaluation. GPProblems hold one ADFStack, which is used to evaluate a large number of trees without having to be garbage-collected and reallocated. Be sure to call stack.reset() after each tree evaluation.

Parameters

base.stack
classname, inherits or = ec.ADFStack		 (the class for the GPProblem's ADF Stack)
base.data
classname, inherits and != ec.GPData		 (the class for the GPProblem's basic GPData type)

Default Base
gp.problem

Parameter bases

base.stack
(stack)
base.data
(data)
See Also:

  • Field Details

  • Constructor Details

    • GPProblem

      public GPProblem()

  • Method Details

    • defaultBase

      public Parameter defaultBase()
      GPProblem defines a default base so your subclass doesn't absolutely have to.
      Specified by:
      defaultBase in interface Prototype
      Overrides:
      defaultBase in class Problem

    • 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 Problem

    • clone

      public Object clone()
      Description copied from interface: Prototype
      Creates a new individual cloned from a prototype, and suitable to begin use in its own evolutionary context.

      Typically this should be a full "deep" clone. However, you may share certain elements with other objects rather than clone hem, depending on the situation:

      • If you hold objects which are shared with other instances, don't clone them.
      • If you hold objects which must be unique, clone them.
      • If you hold objects which were given to you as a gesture of kindness, and aren't owned by you, you probably shouldn't clone them.
      • DON'T attempt to clone: Singletons, Cliques, or Populations, or Subpopulation.
      • Arrays are not cloned automatically; you may need to clone an array if you're not sharing it with other instances. Arrays have the nice feature of being copyable by calling clone() on them.

      Implementations.

      • If no ancestor of yours implements clone(), and you have no need to do clone deeply, and you are abstract, then you should not declare clone().
      • If no ancestor of yours implements clone(), and you have no need to do clone deeply, and you are not abstract, then you should implement it as follows: 

         public Object clone() 
     {
     try
         { 
         return super.clone();
         }
     catch ((CloneNotSupportedException e)
         { throw new InternalError(); } // never happens
     }
      • If no ancestor of yours implements clone(), but you need to deep-clone some things, then you should implement it as follows: 

         public Object clone() 
     {
     try
         { 
         MyObject myobj = (MyObject) (super.clone());

         // put your deep-cloning code here...
         }
     catch ((CloneNotSupportedException e)
         { throw new InternalError(); } // never happens
     return myobj;
     }
      • If an ancestor has implemented clone(), and you also need to deep clone some things, then you should implement it as follows: 

         public Object clone() 
     { 
     MyObject myobj = (MyObject) (super.clone());

     // put your deep-cloning code here...

     return myobj;
     }
      Specified by:
      clone in interface Prototype
      Overrides:
      clone in class Problem