T - type of the permuted objectspublic abstract class RandomKey<T> extends AbstractListChromosome<Double> implements PermutationChromosome<T>
For example, the random key [0.2, 0.3, 0.8, 0.1] corresponds to the permutation of indices (3,0,1,2). If the original (unpermuted) sequence would be (a,b,c,d), this would mean the sequence (d,a,b,c).
With this representation, common operators like n-point crossover can be used, because any such chromosome represents a valid permutation.
Since the chromosome (and thus its arrayRepresentation) is immutable, the array representation is sorted only once in the constructor.
For details, see:
| Constructor and Description |
|---|
RandomKey(Double[] representation)
Constructor.
|
RandomKey(List<Double> representation)
Constructor.
|
| Modifier and Type | Method and Description |
|---|---|
protected void |
checkValidity(List<Double> chromosomeRepresentation)
Asserts that
representation can represent a valid chromosome. |
static <S> List<Double> |
comparatorPermutation(List<S> data,
Comparator<S> comparator)
Generates a representation of a permutation corresponding to the
data sorted by comparator. |
List<T> |
decode(List<T> sequence)
Permutes the
sequence of objects of type T according to the
permutation this chromosome represents. |
static List<Double> |
identityPermutation(int l)
Generates a representation corresponding to an identity permutation of
length l which can be passed to the RandomKey constructor.
|
static <S> List<Double> |
inducedPermutation(List<S> originalData,
List<S> permutedData)
Generates a representation of a permutation corresponding to a
permutation which yields
permutedData when applied to
originalData. |
protected boolean |
isSame(Chromosome another)
Returns
true iff another is a RandomKey and
encodes the same permutation. |
static List<Double> |
randomPermutation(int l)
Generates a representation corresponding to a random permutation of
length l which can be passed to the RandomKey constructor.
|
String |
toString() |
getLength, getRepresentation, newFixedLengthChromosomecompareTo, findSameChromosome, getFitness, searchForFitnessUpdatepublic RandomKey(List<Double> representation) throws InvalidRepresentationException
representation - list of [0,1] values representing the permutationInvalidRepresentationException - iff the representation can not represent a valid chromosomepublic RandomKey(Double[] representation) throws InvalidRepresentationException
representation - array of [0,1] values representing the permutationInvalidRepresentationException - iff the representation can not represent a valid chromosomepublic List<T> decode(List<T> sequence)
sequence of objects of type T according to the
permutation this chromosome represents. For example, if this chromosome
represents a permutation (3,0,1,2), and the unpermuted sequence is
(a,b,c,d), this yields (d,a,b,c).decode in interface PermutationChromosome<T>sequence - the unpermuted (original) sequence of objectssequence represented by this permutationprotected boolean isSame(Chromosome another)
true iff another is a RandomKey and
encodes the same permutation.isSame in class Chromosomeanother - chromosome to compareprotected void checkValidity(List<Double> chromosomeRepresentation) throws InvalidRepresentationException
representation can represent a valid chromosome.checkValidity in class AbstractListChromosome<Double>chromosomeRepresentation - representation of the chromosomeInvalidRepresentationException - iff the representation can not represent a valid chromosomepublic static final List<Double> randomPermutation(int l)
l - length of the permutationpublic static final List<Double> identityPermutation(int l)
l - length of the permutationpublic static <S> List<Double> comparatorPermutation(List<S> data, Comparator<S> comparator)
data sorted by comparator. The
data is not modified during the process.
This is useful if you want to inject some permutations to the initial
population.S - type of the datadata - list of data determining the ordercomparator - how the data will be comparedpublic static <S> List<Double> inducedPermutation(List<S> originalData, List<S> permutedData) throws DimensionMismatchException, MathIllegalArgumentException
permutedData when applied to
originalData.
This method can be viewed as an inverse to decode(List).S - type of the dataoriginalData - the original, unpermuted datapermutedData - the data, somehow permutedoriginalData -> permutedDataDimensionMismatchException - iff the length of originalData
and permutedData lists are not equalMathIllegalArgumentException - iff the permutedData and
originalData lists contain different datapublic String toString()
toString in class AbstractListChromosome<Double>Copyright © 2003–2016 The Apache Software Foundation. All rights reserved.