Class: GABenchmark::StrategiesDSL

Inherits:
Object
  • Object
show all
Defined in:
lib/charlie/gabenchmark.rb

Overview

Used in the GABenchmark#benchmark function.

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ StrategiesDSL

Returns a new instance of StrategiesDSL.



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# File 'lib/charlie/gabenchmark.rb', line 159

def initialize
  @repeat          = 10
  @population_size = 20 
  @generations     = 50
  selection []
  crossover []
  mutator   []
  track_stat{|best| best.fitness } # tracks maximum fitness by default
end

Class Method Details

.attr_dsl(x) ⇒ Object 



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# File 'lib/charlie/gabenchmark.rb', line 132

def attr_dsl(x)
  x = x.to_s
  attr_accessor x
  alias_method 'get_'+x, x  # rename reader
  define_method(x) {|*args| # reader with 0 args, write with 1 arg
    return send('get_'+x) if args.empty?
    args.size > 1 ? send(x+'=',args) : send(x+'=',*args)
  }
end

Instance Method Details

#get_tests ⇒ Object

Get all the tests. Basically a cartesian product of all selection, crossover and mutation methods.



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# File 'lib/charlie/gabenchmark.rb', line 180

def get_tests
  t = []

  defmod = Module.new{self.name='default'}

  selection = [@selection].flatten ; selection = [defmod] if selection.empty?
  crossover = [@crossover].flatten ; crossover = [defmod] if crossover.empty?
  mutator   = [@mutator].flatten   ; mutator   = [defmod] if   mutator.empty?

  selection.each{|s|
   crossover.each{|c| 
    mutator.each{|m|
     t << [s,c,m]
    }
   }
  }
  t
end

#track_stat(&b) ⇒ Object Also known as: track_stats

Pass a block that returns one or more statistics to track. Block is passed the individual with the highest fitness after each run.

  • Can be used to track, for example, training error vs generalization error.

  • Default is fitness of the best solution.

  • When returning multiple values, <=> for arrays is used to determine the best individual in the info table (i.e. second elements only for tie-breaking), but min/max/avg/stddev stats are calculated independently for each component



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# File 'lib/charlie/gabenchmark.rb', line 173

def track_stat(&b)
  return @track_stat unless block_given?
  @track_stat = b
end