Module: Annealing::Configuration::Coolers

Defined in:
lib/annealing/configuration/coolers.rb

Overview

Built-in cool down functions

Class Method Summary collapse

Class Method Details

.exponential ⇒ Object

Reduce temperature exponentially on each step by the cooling rate



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# File 'lib/annealing/configuration/coolers.rb', line 17

def exponential
  lambda { |_energy, temperature, cooling_rate, steps|
    temperature - (Math.exp(steps - 1) * cooling_rate)
  }
end

.geometric(ratio = 2) ⇒ Object

Reduce temperature geometrically at a given ratio by the cooling rate



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# File 'lib/annealing/configuration/coolers.rb', line 24

def geometric(ratio = 2)
  unless ratio.positive?
    raise(Annealing::Configuration::ConfigurationError,
          "geometric ratio must be positive")
  end

  lambda { |_energy, temperature, cooling_rate, steps|
    temperature - (cooling_rate * (ratio**(steps - 1)))
  }
end

.linear ⇒ Object

Reduce temperature linearly by the cooling rate



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# File 'lib/annealing/configuration/coolers.rb', line 10

def linear
  lambda { |_energy, temperature, cooling_rate, _steps|
    temperature - cooling_rate
  }
end