Class: Spea2

Inherits:
AlgorithmBase show all
Includes:
Breed, PhenotypicTruncation
Defined in:
../algorithm/spea2.rb

Instance Attribute Summary (collapse)

Attributes included from PhenotypicTruncation

#duplicate_elimination, #shorten_individual

Attributes included from Breed

#inject

Attributes inherited from AlgorithmBase

#init, #population_size, #probabilities, #termination

Instance Method Summary (collapse)

Methods included from PhenotypicTruncation

#eliminate_duplicates, #phenotypic_truncation

Methods inherited from AlgorithmBase

#finished?

Instance Attribute Details

- (Object) max_archive_size

Returns the value of attribute max_archive_size 



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# File '../algorithm/spea2.rb', line 37

def max_archive_size
  @max_archive_size
end

- (Object) shorten_archive_individual

Returns the value of attribute shorten_archive_individual 



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# File '../algorithm/spea2.rb', line 37

def shorten_archive_individual
  @shorten_archive_individual
end

Instance Method Details

- (Object) setup(config) 



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# File '../algorithm/spea2.rb', line 39

def setup config
  super

  @ranker = @selection.ranker
  @ranker.shorten_individual = @shorten_archive_individual 
  
  @archive, @population = @store.load
  @archive = [] if @archive.nil?
  @population = [] if @population.nil?

  @report << "loaded #{@population.size} population individuals"   
  @report << "creating #{@population_size - @population.size} population individuals"
  init_population( @population, @population_size )
  @report << "loaded #{@archive.size} archive individuals"
  
  @report.next    
  return @report 
end

- (Object) step 



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# File '../algorithm/spea2.rb', line 64

def step
  @report.next    
  @report << "--------- step #{@steps += 1}"

  combined = @population.clone
  combined.concat @archive
  @ranker.population = combined

  @archive = @ranker.environmental_selection @max_archive_size

   
  if @duplicate_elimination
    @cross, @injections, @mutate = 0, 0, 0  
    sizes = []

    @population = []
    while @population.size < @population_size
      @selection.population = @archive.clone
      new_populaton = breed_by_selector_no_report( @selection, @population_size )
      @population.concat new_populaton
      @population = eliminate_duplicates @population
      sizes << @population.size
    end

    @report['eliminated_sizes'] << sizes
    @report['numof_crossovers'] << @cross   
    @report['numof_injections'] << @injections
    @report['numof_mutations'] << @mutate
    @report['time_eval'] << @time_eval        
    @report['numof_evaluations'] << @evaluator.jobs_processed if defined? @evaluator

  else
    @selection.population = @archive
    @population = breed_by_selector( @selection, @population_size )  
  end
 
  @report.report @archive
  return @report
end

- (Object) teardown 



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# File '../algorithm/spea2.rb', line 58

def teardown
  @report << "--------- finished:"
  @store.save [@archive, @population]
  return @report   
end