Class: Wallace::Operators::UniformCrossoverOperator

Inherits:
Wallace::Operator show all
Defined in:
lib/operators/uniform_crossover_operation.rb

Overview

Uniform crossover takes two individuals as parents, A and B, and produces two children, C and D, by swapping genes according to the mixing ratio probability. Using a mixing ratio of 0.5 should result in individuals which share half of their genes with a given parent.

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Wallace::Operator

#produce

Constructor Details

#initialize(opts = {}) ⇒ UniformCrossoverOperator

Constructs a new uniform crossover operator.

Parameters:

  • opts, a hash of keyword options for this method. -> id, the unique identifier for this operator. -> inputs, an array of inputs (OperatorInput) to this operator. -> ratio, the mixing ratio to use during crossover. (default = 0.5).



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# File 'lib/operators/uniform_crossover_operation.rb', line 18

def initialize(opts = {})
  super(opts)
  @ratio = opts[:ratio] || 0.5
end

Instance Attribute Details

#ratio ⇒ Object

Allow the mixing ratio to be dynamically adjusted.



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# File 'lib/operators/uniform_crossover_operation.rb', line 9

def ratio
  @ratio
end

Instance Method Details

#operate(rng, inputs) ⇒ Object 



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# File 'lib/operators/uniform_crossover_operation.rb', line 23

def operate(rng, inputs)
  (0...inputs[0].length).each do |i|
    inputs[0][i], inputs[1][i] = inputs[1][i], inputs[0][i] if rng.rand <= @ratio
  end
  return inputs
end