class NEAT::Critter

Critters for NEAT¶ ↑

The Critter class comprises a Genotype and a Phenotype.
The Genotype comprises Genes and Neurons.

Attributes

fitness[RW]

Ratings assigned by Evaluator

genotype[RW]

novelty[RW]

Ratings assigned by Evaluator

phenotype[RW]

population[R]

Public Class Methods

new(pop, mating = false, &block) click to toggle source

Critter construction. We construct the genotype. The phenotype will be constructed by the Expressor operator.

Calls superclass method

# File lib/rubyneat/critter.rb, line 20
def initialize(pop, mating = false, &block)
  super pop.controller
  @population = pop
  @genotype = Genotype.new(self, mating)
  block.(self) unless block.nil?
end

Public Instance Methods

compare(oc) click to toggle source

Compare ourselves against another critter for compability.

The function to be used here is:

distance = c1*E + c2*D + c3*W

Where:

E, D - The number of excess and disjoint genes repesctively.
N - The number of genes in the largest genome.
W - The sum of absolute weight differences.

This is a variation of the formulation suggested by the Stanley paper, which normalizes the E and D terms by N.

# File lib/rubyneat/critter.rb, line 333
def compare(oc)
  c1 = @controller.parms.excess_coefficient
  c2 = @controller.parms.disjoint_coefficient
  c3 = @controller.parms.weight_coefficient
  e = excess(oc)
  d = disjoint(oc)
  w = weight_diff(oc)
  return c1 * e + c2 * d + c3 * w
end

dump_s() click to toggle source

Critter print

# File lib/rubyneat/critter.rb, line 344
def dump_s
  to_s + @genotype.dump_s + "\n" + @phenotype.to_s + "\n"
end

evaluate!() click to toggle source

A single evaluation step. Evaluate and generate fitness, novelty, etc. Returns the result.

# File lib/rubyneat/critter.rb, line 50
def evaluate!
  @controller.evaluator.evaluate! self
end

express!() click to toggle source

Exoress this critter using the Expressor plugin.

# File lib/rubyneat/critter.rb, line 36
def express!
  @controller.expressor.express! self
end

initialize_neurons!() click to toggle source

This initializes neurons in preparation for recurrence. Note that the Critter should already have expressed its genotype before this is called.

# File lib/rubyneat/critter.rb, line 43
def initialize_neurons!
  @phenotype.initialize_neurons
end

ready_for_expression!() click to toggle source

Get the Critter ready for the Expressor to express the geneotype.

# File lib/rubyneat/critter.rb, line 29
def ready_for_expression!
  @genotype.wire!
  @phenotype = NEAT::Critter::Phenotype[self]
  @phenotype
end