Class: NEAT::Evaluator

Inherits:

Operator

• Object
• NeatOb
• Operator
• NEAT::Evaluator

show all

Defined in:

lib/rubyneat/evaluator.rb

Overview

Instance Attribute Summary

Attributes inherited from NeatOb

#controller, #name

Instance Method Summary (collapse)

• - (Object) analyze_for_fitness!(critter)

  Analyze the evaluation and compute a fitness for the given critter.

• - (Object) evaluate!(critter)

  Evaluate one step of a sequence of evaluations.

• - (Object) ready_for_evaluation(pop)

  This is call prior to any sequence evaluation.

Methods inherited from NeatOb

#initialize, #log, log, #to_s

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# File 'lib/rubyneat/evaluator.rb', line 40

def analyze_for_fitness!(critter)
  fitvec = @crit_hist[critter].map{|seq, vio| @controller.fitness_func.(vio[0], vio[1], seq) }
  # Average the fitness vector to get a scalar fitness.
  critter.fitness = unless @controller.cost_func.nil?
                      @controller.cost_func.(fitvec, critter.genotype.fitness_cost)
                    else
                      fitvec.reduce {|a,r| a+r} / fitvec.size.to_f + critter.genotype.fitness_cost
                    end
  log.debug "Fitness Vector: #{fitvec}, fitness of #{critter.fitness} assigned to #{critter}"
end

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# File 'lib/rubyneat/evaluator.rb', line 24

def evaluate!(critter)
  vin = @controller.query_func.(@controller.seq_num)
  @crit_hist[critter] = {} unless @crit_hist.member? critter
  begin
    vout = critter.phenotype.stimulate *vin, &@controller.recurrence_func
    log.debug "Critter #{critter.name}: vin=#{vin}. vout=#{vout}"
    @crit_hist[critter][@controller.seq_num] = [vin, vout]
  rescue Exception => e
    log.error "Exception #{e} on code:\n#{critter.phenotype.code}"
    @crit_hist[critter][@controller.seq_num] = [vin, :error]
  end
end

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# File 'lib/rubyneat/evaluator.rb', line 10

def ready_for_evaluation(pop)
  @crit_hist = {}
  pop.initialize_for_recurrence!
end