Class: Selection::ParetoTourney

Inherits:

Object

• Object
• Selection::ParetoTourney

show all

Defined in:

../lib/pareto_tourney.rb

Overview

Instance Attribute Summary (collapse)

• - (Object) population

  The population to select from.

• - (Object) random

  The source of randomness, used for calling “random.rand( limit )”, defaulting to ‘Kernel’ class.

• - (Object) tournament_size

  The number of randomly selected individuals for dominance evaluation.

Instance Method Summary (collapse)

• - (ParetoTourney) initialize(tournament_size = 2) constructor

  Set the tournament_size (see the attribute) for selections.

• - (Object) select_dominated(population = self.population)

  Select all dominated solutions from the random subset of the population.

• - (Object) select_front(population = self.population)

  Select all nondominated solutions from the random subset of the population.

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# File '../lib/pareto_tourney.rb', line 12

def initialize tournament_size=2
  @tournament_size = tournament_size
  @random = Kernel
end

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# File '../lib/pareto_tourney.rb', line 21

def population
  @population
end

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# File '../lib/pareto_tourney.rb', line 18

def random
  @random
end

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# File '../lib/pareto_tourney.rb', line 24

def tournament_size
  @tournament_size
end

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# File '../lib/pareto_tourney.rb', line 32

def select_dominated population=self.population
  Moea::Pareto.dominated( random_select( population ) )
end

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# File '../lib/pareto_tourney.rb', line 27

def select_front population=self.population
  Moea::Pareto.nondominated( random_select( population ) )
end