Class PlackettLuceModel

java.lang.Object

com.knezevic.edaf.v3.models.permutation.PlackettLuceModel

All Implemented Interfaces:

Model<PermutationVector>

public final class PlackettLuceModel
extends Object
implements Model<PermutationVector>

Plackett-Luce model for permutations.

Each item i has non-negative weight w_i. A permutation is generated sequentially by sampling one item at a time from the remaining set:

   P(i chosen at step k) = w_i / Σ_{j in remaining} w_j
 

Weights are estimated from elite position scores, then normalized.

Constructor Summary

Constructors

Constructor	Description
PlackettLuceModel()

Method Summary

Modifier and Type	Method	Description
ModelDiagnostics	diagnostics()	Exposes diagnostics (entropy, covariance condition number, etc.).
void	fit(List<Individual<PermutationVector>> selected, Representation<PermutationVector> representation, RngStream rng)	Fits model parameters from selected individuals.
String	name()	Model identifier used in configuration and listing commands.
List<PermutationVector>	sample(int count, Representation<PermutationVector> representation, Problem<PermutationVector> problem, ConstraintHandling<PermutationVector> constraintHandling, RngStream rng)	Samples new genotypes from model.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.knezevic.edaf.v3.core.api.Model

update

Constructor Details

PlackettLuceModel

public PlackettLuceModel()

Method Details

name

public String name()

Description copied from interface: Model

Model identifier used in configuration and listing commands.

Specified by:

name in interface Model<PermutationVector>

fit

public void fit(List<Individual<PermutationVector>> selected,
 Representation<PermutationVector> representation,
 RngStream rng)

Description copied from interface: Model

Fits model parameters from selected individuals.

Specified by:

fit in interface Model<PermutationVector>

sample

public List<PermutationVector> sample(int count,
 Representation<PermutationVector> representation,
 Problem<PermutationVector> problem,
 ConstraintHandling<PermutationVector> constraintHandling,
 RngStream rng)

Description copied from interface: Model

Samples new genotypes from model.

Specified by:

sample in interface Model<PermutationVector>

diagnostics

public ModelDiagnostics diagnostics()

Description copied from interface: Model

Exposes diagnostics (entropy, covariance condition number, etc.).

Specified by:

diagnostics in interface Model<PermutationVector>