Module: EvoSynth::Evolvers

Defined in:
lib/evosynth/evolvers/elitism.rb,
lib/evosynth/evolvers/evolver.rb,
lib/evosynth/evolvers/runnable_evolver.rb,
lib/evosynth/evolvers/basic/hillclimber.rb,
lib/evosynth/evolvers/basic/steady_state_ga.rb,
lib/evosynth/evolvers/profile_using_evolver.rb,
lib/evosynth/evolvers/basic/genetic_algorithm.rb,
lib/evosynth/evolvers/basic/memetic_algorithm.rb,
lib/evosynth/evolvers/local_search/local_search.rb,
lib/evosynth/evolvers/basic/population_hillclimber.rb,
lib/evosynth/evolvers/evolution_strategies/adaptive_es.rb,
lib/evosynth/evolvers/local_search/acceptance_threshold.rb,
lib/evosynth/evolvers/local_search/acceptance_hillclimber.rb,
lib/evosynth/evolvers/evolution_strategies/derandomized_es.rb,
lib/evosynth/evolvers/evolution_strategies/selfadaptive_es.rb,
lib/evosynth/evolvers/local_search/acceptance_great_deluge.rb,
lib/evosynth/evolvers/coevolutionary/balanced_coevolutionary.rb,
lib/evosynth/evolvers/local_search/acceptance_record_to_record.rb,
lib/evosynth/evolvers/coevolutionary/round_robin_coevolutionary.rb,
lib/evosynth/evolvers/local_search/acceptance_simulated_annealing.rb

Defined Under Namespace

Modules: Evolver, ProfileUsingEvolver, RunnableEvolver Classes: AdaptiveES, BalancedCoevolutionary, DerandomizedES, GeneticAlgorithm, Hillclimber, LocalSearch, MemeticAlgorithm, PopulationHillclimber, RoundRobinCoevolutionary, SelfAdaptiveES, SteadyStateGA

Class Method Summary collapse

Class Method Details

.add_strong_elistism(evolver, n = 1) ⇒ Object

this function adds weak elistism to a evolver using instance_eval

strong elitism: copy best n parents into offspring population (replace worst n childrens)

TODO: add some elegance to this code ;-)



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# File 'lib/evosynth/evolvers/elitism.rb', line 65

def Evolvers.add_strong_elistism(evolver, n = 1)
	evolver.population rescue raise "Evolver not supported!"

	if (n == 1)
		evolver.instance_eval("
			alias :original_next_generation :next_generation
			alias :original_to_s :to_s

			def next_generation
				best = population.best

				original_next_generation

				population.remove(population.worst)
				population.add(best)
			end

			def to_s
				'<< strong elitism >> ' + original_to_s
			end
		")
	else
		evolver.instance_eval("
			alias :original_next_generation :next_generation
			alias :original_to_s :to_s

			def next_generation
				best = population.best(#{n})

				original_next_generation

				worst = population.worst(#{n})
				worst.each { |individual| population.remove(individual) }
				best.each { |individual| population.add(individual) }
			end

			def to_s
				'<< strong elitism >> ' + original_to_s
			end
		")
	end
end

.add_weak_elistism(evolver) ⇒ Object

this function adds weak elistism to a evolver using instance_eval

weak elitism: if fitness of childrens decreased, replace worst individual with best parent



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# File 'lib/evosynth/evolvers/elitism.rb', line 35

def Evolvers.add_weak_elistism(evolver)
	evolver.population rescue raise "Evolver not supported!"

	evolver.instance_eval(%q{
		alias :original_next_generation :next_generation
		alias :original_to_s :to_s

		def next_generation
			best_individual = population.best

			original_next_generation

			if population.best < best_individual
				population.remove(population.worst)
				population.add(best_individual)
			end
		end

		def to_s
			"<< weak elitism >> " + original_to_s
		end
	})
end