Class BLXAlphaCrossover

Namespace

OptunaSharp.Samplers.Nsgaii

Assembly

OptunaSharp.dll

Blend Crossover operation used by NSGAIISampler. Port of optuna/samplers/nsgaii/_crossovers/_blxalpha.py: BLXAlphaCrossover (experimental v3.0.0).

Uniformly samples child individuals from the hyper-rectangles created by the two parent individuals.

public class BLXAlphaCrossover : BaseCrossover

Inheritance

object

BaseCrossover

BLXAlphaCrossover

Inherited Members

BaseCrossover.ToString()

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

Constructors

BLXAlphaCrossover(double)

Configures how far uniform offspring intervals extend beyond the two parent coordinates.

public BLXAlphaCrossover(double alpha = 0.5)

Parameters

alpha double

Parametrizes blend operation.

Properties

NParents

Number of parent individuals required to perform crossover.

public override int NParents { get; }

Property Value

int

Methods

Crossover(double[][], NumPyRandom, Study, double[,])

Perform crossover of selected parent individuals.

public override double[] Crossover(double[][] parentsParams, NumPyRandom rng, Study study, double[,] searchSpaceBounds)

Parameters

parentsParams double[][]

A num_parents x num_parameters array. Represents a parameter space for each parent individual (continuous for numerical parameters). Row i is parent i.

rng NumPyRandom

An instance of numpy.random.RandomState.

study Study

Target study object.

searchSpaceBounds double[,]

A len_search_space x 2 array of numerical distribution bounds constructed from the transformed search space. Column 0 is lower, column 1 is upper.

Returns

double[]

A 1-dimensional array containing the new parameter combination.