Class: MHL::HyperMutationPlusRechenbergController

Inherits:
Object
  • Object
show all
Defined in:
lib/mhl/hm_plus_rechenberg_controller.rb

Constant Summary collapse

DEFAULT_HM_GENERATIONS = 
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Instance Method Summary collapse

Constructor Details

#initialize(params = {}) ⇒ HyperMutationPlusRechenbergController

Returns a new instance of HyperMutationPlusRechenbergController.



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# File 'lib/mhl/hm_plus_rechenberg_controller.rb', line 7

def initialize(params={})
  @opts = { keep_for: DEFAULT_HM_GENERATIONS }.merge!(params)
  @rc = RechenbergController.new
  @gen = @gens_from_last_reset = 1
end

Instance Method Details

#call(solver, best) ⇒ Object 



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# File 'lib/mhl/hm_plus_rechenberg_controller.rb', line 13

def call(solver, best)
  if @pending_reset
    # set mutation_probability to HM value
    solver.mutation_probability = @pending_reset

    # reinitialize controller
    @rc = RechenbergController.new

    # reinitialize counter of generations from last reset
    @gens_from_last_reset = 0

    # undefine pending_reset
    # NOTE: not sure if we should we go as far as calling
    # remove_instance_variable(:@pending_reset) here
    @pending_reset = nil
  end

  # do nothing for the first @opts[:keep_for] generations
  if @gens_from_last_reset > @opts[:keep_for]
    @rc.call(solver, best)
  end

  # update counters
  @gen += 1
  @gens_from_last_reset += 1
end

#reset_mutation_probability(value) ⇒ Object 



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# File 'lib/mhl/hm_plus_rechenberg_controller.rb', line 40

def reset_mutation_probability(value)
  @pending_reset = value
end