Class: Musa::Darwin::Darwin

Inherits:
Object
  • Object
show all
Defined in:
lib/musa-dsl/generative/darwin.rb

Defined Under Namespace

Classes: MainContext, Measure, MeasuresEvalContext

Instance Method Summary collapse

Constructor Details

#initialize(&block) ⇒ Darwin

Returns a new instance of Darwin.

Raises:

  • (ArgumentError) 


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# File 'lib/musa-dsl/generative/darwin.rb', line 6

def initialize(&block)
  raise ArgumentError, 'block is needed' unless block

  main_context = MainContext.new &block

  @measures = main_context._measures
  @weights = main_context._weights
end

Instance Method Details

#evaluate_weights(measure_a, measure_b) ⇒ Object 



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# File 'lib/musa-dsl/generative/darwin.rb', line 60

def evaluate_weights(measure_a, measure_b)
  measure_b.evaluate_weight(@weights) <=> measure_a.evaluate_weight(@weights)
end

#select(population) ⇒ Object 



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# File 'lib/musa-dsl/generative/darwin.rb', line 15

def select(population)
  measured_objects = []

  population.each do |object|
    context = MeasuresEvalContext.new

    context.with object, **{}, &@measures
    measure = context._measure

    measured_objects << { object: object, measure: context._measure } unless measure.died?
  end

  limits = {}

  measured_objects.each do |measured_object|
    measure = measured_object[:measure]

    measure.dimensions.each do |measure_name, value|
      limit = limits[measure_name] ||= { min: nil, max: nil }

      limit[:min] = value.to_f if limit[:min].nil? || limit[:min] > value
      limit[:max] = value.to_f if limit[:max].nil? || limit[:max] < value

      limit[:range] = limit[:max] - limit[:min]
    end
  end

  # warn "Darwin.select: weights #{@weights}"

  measured_objects.each do |measured_object|
    measure = measured_object[:measure]

    measure.dimensions.each do |dimension_name, value|
      limit = limits[dimension_name]
      measure.normalized_dimensions[dimension_name] = (value - limit[:min]) / limit[:range]
    end

    # warn "Darwin.select: #{measured_object[:object]} #{measured_object[:measure]} weight=#{measured_object[:measure].evaluate_weight(@weights).round(2)}"
  end

  measured_objects.sort! { |a, b| evaluate_weights a[:measure], b[:measure] }

  measured_objects.collect { |measured_object| measured_object[:object] }
end