Module: Ai::Neat

Defined in:
lib/ai/neat.rb,
lib/ai/neat/node.rb,
lib/ai/neat/layer.rb,
lib/ai/neat/method.rb,
lib/ai/neat/network.rb,
lib/ai/neat/version.rb,
lib/ai/neat/creature.rb

Defined Under Namespace

Classes: Creature, Layer, Neat, Network, Node

Constant Summary collapse

VERSION = 
"0.2.5"

Class Method Summary collapse

Class Method Details

.activationfunc(method, value) ⇒ Object 



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# File 'lib/ai/neat/method.rb', line 5

def self.activationfunc(method, value)
  case method.to_sym
  when :relu
    value.positive? ? value : 0
  when :tanh
    Math.tanh(value)
  when :sigmoid
    (1 / (1 + Math.exp(-value)))
  when :leaky_relu
    value.positive? ? value : (value * 0.01)
  when :softmax
    sum = 0
    result = []

    value.each do |v|
      sum += Math.exp(v)
    end

    value.each do |v|
      result.push(Math.exp(v) / sum)
    end

    result
  end
end

.crossover(method, genes_x, genes_y) ⇒ Object 



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# File 'lib/ai/neat/method.rb', line 31

def self.crossover(method, genes_x, genes_y)
  case method.to_sym
  when :random
    genes = []

    (0..(genes_x.count - 1)).each do |i|
      rand < 0.5 ? genes.push(genes_x[i]) : genes.push(genes_y[i])
    end

    genes
  when :slice
    start_index = (rand * genes_x.count).to_i
    end_index = (rand * (genes_x.count - start_index + 2)).to_i + start_index + 1
    cut_genes = genes_x[start_index..end_index]

    genes = genes_y.clone

    genes.slice!(start_index..end_index)
    genes.concat(cut_genes)

    genes
  end
end

.mutate(method, genes, rate) ⇒ Object 



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# File 'lib/ai/neat/method.rb', line 55

def self.mutate(method, genes, rate)
  genes = genes.clone

  case method.to_sym
  when :random
    (0..(genes.count - 1)).each do |i|
      genes[i] = rand(-1.0..1.0) if rand < rate
    end
  when :edit
    (0..(genes.count - 1)).each do |i|
      genes[i] += rand(-0.5..0.5) if rand < rate
    end
  end

  genes
end