Class: Spea2Ranking

Inherits:

Ranking

• Object
• Ranking
• Spea2Ranking

show all

Includes:

PhenotypicTruncation

Defined in:

../algorithm/spea2.rb

Instance Attribute Summary

Attributes included from PhenotypicTruncation

#duplicate_elimination, #shorten_individual

Instance Method Summary (collapse)

• - (Object) environmental_selection(max_size)
• - (Spea2Ranking) initialize constructor

  A new instance of Spea2Ranking.

• - (Object) population=(pop)
• - (Object) rank(selected)

Methods included from PhenotypicTruncation

#eliminate_duplicates, #phenotypic_truncation

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# File '../algorithm/spea2.rb', line 9

def initialize
  @dominance = Dominance.new
  @reranker = Ranking.new( :spea, :minimize )
end

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# File '../algorithm/spea2.rb', line 25

def environmental_selection max_size
  valid_population = @ranked_pop.find_all { |individual| individual.original.valid? }
  valid_population.sort! {|a,b| a.spea <=> b.spea } 
  limited_population = valid_population[ 0...max_size ].map { |individual| individual.original }
  phenotypic_truncation( limited_population, 0 )   
end

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# File '../algorithm/spea2.rb', line 14

def population= pop
  @ranked_pop = @dominance.rank_count pop
end

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# File '../algorithm/spea2.rb', line 18

def rank selected
  rank_selection = selected.map { |orig| @ranked_pop.find { |r| r.original == orig } }
  reranked = @reranker.rank( rank_selection )   
  reranked.each { |field| field.original = field.original.original } 
  reranked
end