classifier.gp
Class MutationPlain

java.lang.Object
  classifier.gp.MutationPlain

All Implemented Interfaces:

MutationOperator, Operators, java.io.Serializable

public class MutationPlain

extends java.lang.Object

implements MutationOperator

Implementation of the classical mutation operator

Version:

0.1

Author:

Sacchi Matteo, Sassi Federico

See Also:

Serialized Form

Field Summary

(package private) Condition	is_function
(package private) Condition	is_program
protected int	max_depth
protected int	mut_depth
protected GProgram[]	program
(package private) GProgram	program_old

Constructor Summary

MutationPlain(int method_generation, double internal, int max_depth)
Inizialize the parameters of the mutation

Method Summary

double	getInternalRate() Probability that a internal node is chosen as a mutation point
int	getMaxDepth() Maximum allowable depth of the resulting tree
int	getMethodOfGeneration()
void	setInternalRate(double internal) To change the probability that a internal node is chosen as a mutation point
void	setMaxDetph(int max) To change the maximum allowable depth of a tree
void	setMethodOfGeneration(int method)
GProgram[]	start(GProgram[] gprogram, FunctionSet functionset, TerminalSet terminalset) Method to start the mutation operation
(package private) void	validateMutation(GProgram[] program)

Methods inherited from class java.lang.Object

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

Field Detail

program

protected GProgram[] program

program_old

GProgram program_old

max_depth

protected int max_depth

mut_depth

protected int mut_depth

is_function

Condition is_function

is_program

Condition is_program

Constructor Detail

MutationPlain

public MutationPlain(int method_generation,
                     double internal,
                     int max_depth)

Inizialize the parameters of the mutation

Parameters:

method_generation - 1=FULL 2=GROW 3=RAMPED HALF AND HALF as you can see in MethodOfGeneration class

internal - Probability [0..1] that a internal node is chosen as a mutation point, it should kept low

max_depth - Maximum allowable depth of the resulting tree

Method Detail

getMaxDepth

public int getMaxDepth()

Maximum allowable depth of the resulting tree

Returns:

An integer that correspond to the maximum allowable depth of a tree

getInternalRate

public double getInternalRate()

Probability that a internal node is chosen as a mutation point

Returns:

The probability as a double in the range [0..1]

setMaxDetph

public void setMaxDetph(int max)

To change the maximum allowable depth of a tree

Parameters:

max - new integer value of the maximum depth

setInternalRate

public void setInternalRate(double internal)

To change the probability that a internal node is chosen as a mutation point

Parameters:

internal - a double value in the range of [0..1]

getMethodOfGeneration

public int getMethodOfGeneration()

setMethodOfGeneration

public void setMethodOfGeneration(int method)

start

public GProgram[] start(GProgram[] gprogram,
                        FunctionSet functionset,
                        TerminalSet terminalset)

Description copied from interface: MutationOperator

Method to start the mutation operation

Specified by:

start in interface MutationOperator

Parameters:

gprogram - an array that contain the GProgram to be mutated

functionset - an object that contain the function set from what to generate the new mutate program

terminalset - an object that contain the terminal set from what to generate the new mutate program

Returns:

an array of one GProgram contating the mutate one

validateMutation

void validateMutation(GProgram[] program)