Class GABenchmark::StrategiesDSL
In: lib/charlie/gabenchmark.rb
Parent: Object

Used in the GABenchmark#benchmark function.

Methods

attr_dsl   get_tests   new   setup   teardown   track_stat   track_stats  

External Aliases

mutator -> mutation
mutator= -> mutation=

Public Class methods

attr_dsl(x)

[Source]

     # File lib/charlie/gabenchmark.rb, line 141
141:     def attr_dsl(x)
142:       x = x.to_s
143:       attr_accessor x
144:       alias_method 'get_'+x, x  # rename reader
145:       define_method(x) {|*args| # reader with 0 args, write with 1 arg
146:         return send('get_'+x) if args.empty?
147:         args.size > 1 ? send(x+'=',args) : send(x+'=',*args)
148:       }
149:     end
new()

[Source]

     # File lib/charlie/gabenchmark.rb, line 168
168:   def initialize
169:     @repeat          = 10
170:     @population_size = 20 
171:     @generations     = 50 
172:     @setup = @teardown = proc{}
173:     selection []
174:     crossover []
175:     mutator   []
176:     track_stat{|best| best.fitness } # tracks maximum fitness by default
177:   end

Public Instance methods

get_tests()

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

[Source]

     # File lib/charlie/gabenchmark.rb, line 202
202:   def get_tests
203:     t = []
204: 
205:     defmod = Module.new{self.name='default'}
206: 
207:     selection = [@selection].flatten ; selection = [defmod] if selection.empty?
208:     crossover = [@crossover].flatten ; crossover = [defmod] if crossover.empty?
209:     mutator   = [@mutator].flatten   ; mutator   = [defmod] if   mutator.empty?
210: 
211:     selection.each{|s|
212:      crossover.each{|c| 
213:       mutator.each{|m|
214:        t << [s,c,m]
215:       }
216:      }
217:     }
218:     t
219:   end
setup(&b)

Pass a block that does the setup. Rarely needed. The proc is passes the population before each test (i.e. between Population.new and evolve_silent)

[Source]

     # File lib/charlie/gabenchmark.rb, line 190
190:   def setup(&b)
191:     return @setup unless block_given?
192:     @setup = b
193:   end
teardown(&b)

Pass a block that does the setup. Rarely needed. Called with the population as argument AFTER track_stats.

[Source]

     # File lib/charlie/gabenchmark.rb, line 196
196:   def teardown(&b)
197:     return @teardown unless block_given?
198:     @teardown = b
199:   end
track_stat(&b)

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

[Source]

     # File lib/charlie/gabenchmark.rb, line 183
183:   def track_stat(&b)
184:     return @track_stat unless block_given?
185:     @track_stat = b
186:   end
track_stats(&b)

Alias for track_stat

[Validate]