Class: EvoSynth::Selections::NStageTournamentSelection

Inherits:
Object
  • Object
show all
Defined in:
lib/evosynth/operators/selections/n_stage_tournament_selection.rb

Overview

Q-STUFIGE-TURNIER-SELEKTION (Weicker Page 69)

Constant Summary collapse

DEFAULT_STAGES = 
2

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(stages = DEFAULT_STAGES) ⇒ NStageTournamentSelection

Returns a new instance of NStageTournamentSelection.



37
38
39
 
# File 'lib/evosynth/operators/selections/n_stage_tournament_selection.rb', line 37

def initialize(stages = DEFAULT_STAGES)
	@stages = stages
end

Instance Attribute Details

#stages ⇒ Object

Returns the value of attribute stages.



33
34
35
 
# File 'lib/evosynth/operators/selections/n_stage_tournament_selection.rb', line 33

def stages
  @stages
end

Instance Method Details

#select(population, select_count = 1) ⇒ Object 



41
42
43
44
45
46
47
48
49
 
# File 'lib/evosynth/operators/selections/n_stage_tournament_selection.rb', line 41

def select(population, select_count = 1)
	selected_population = EvoSynth::Population.new

	scores = calculate_scores(population)
	scores = scores.sort { |first, second| first[0] <=> second[0] * -1 }
	scores.first(select_count).each { |winner| selected_population.add(winner[1]) }

	selected_population
end

#to_s ⇒ Object 



51
52
53
 
# File 'lib/evosynth/operators/selections/n_stage_tournament_selection.rb', line 51

def to_s
	"n-stage tournament selection <stages: #{@stages}>"
end