Class: EvoSynth::Evolvers::SelfAdaptiveES

Inherits:
Object
  • Object
show all
Includes:
Evolver
Defined in:
lib/evosynth/evolvers/evolution_strategies/selfadaptive_es.rb

Overview

ES-SELBSTADAPTIV (Weicker Page 135)

Constant Summary collapse

DEFAULT_CHILD_FACTOR = 
5
DEFAULT_MUTATION = 
EvoSynth::Mutations::SelfAdaptiveGaussMutation.new
DEFAULT_PARENT_SELECTION = 
EvoSynth::Selections::RandomSelection.new
DEFAULT_ENV_SELECTION = 
EvoSynth::Selections::SelectBest.new

Instance Attribute Summary

Attributes included from RunnableEvolver

#generations_computed

Instance Method Summary collapse

Methods included from ProfileUsingEvolver

#init_profile, #use_profile

Methods included from RunnableEvolver

#run_until, #run_until_fitness_reached, #run_until_generations_reached

Constructor Details

#initialize(profile) ⇒ SelfAdaptiveES

Returns a new instance of SelfAdaptiveES.


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# File 'lib/evosynth/evolvers/evolution_strategies/selfadaptive_es.rb', line 38

def initialize(profile)
	init_profile :population,
	    :evaluator,
	    :child_factor			=> DEFAULT_CHILD_FACTOR,
	    :mutation				=> DEFAULT_MUTATION,
	    :enviromental_selection => DEFAULT_ENV_SELECTION,
	    :parent_selection		=> DEFAULT_PARENT_SELECTION

	use_profile profile

	@population.each { |individual| @evaluator.calculate_and_set_initial_fitness(individual) }
end

Instance Method Details

#best_solution ⇒ Object 


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# File 'lib/evosynth/evolvers/evolution_strategies/selfadaptive_es.rb', line 55

def best_solution
	@population.best
end

#next_generation ⇒ Object 


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# File 'lib/evosynth/evolvers/evolution_strategies/selfadaptive_es.rb', line 67

def next_generation
	child_population = EvoSynth::Population.new

	(@child_factor * @population.size).times do
		parent = @parent_selection.select(@population, 1).first
		child = @mutation.mutate(parent)
		@evaluator.calculate_and_set_fitness(child)
		child_population << child
	end

	@population = @enviromental_selection.select(child_population, @population.size)
end

#return_result ⇒ Object 


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# File 'lib/evosynth/evolvers/evolution_strategies/selfadaptive_es.rb', line 63

def return_result
	@population
end

#to_s ⇒ Object 


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# File 'lib/evosynth/evolvers/evolution_strategies/selfadaptive_es.rb', line 51

def to_s
	"selfadaptive ES <mutation: #{@mutation}, parent selection: #{@parent_selection}, parent selection: #{@parent_selection}, enviromental selection: #{@enviromental_selection}>"
end

#worst_solution ⇒ Object 


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# File 'lib/evosynth/evolvers/evolution_strategies/selfadaptive_es.rb', line 59

def worst_solution
	@population.worst
end