Class: CooCoo::ActivationFunctions::ZeroSafeNormalize

Inherits:
Identity show all
Defined in:
lib/coo-coo/activation_functions.rb

Overview

Like the Normalize but safe when the input is all the same value.

Instance Method Summary collapse

Methods inherited from Identity

#initial_bias, #initial_weights, method_missing, #name, #prep_input, #to_s

Instance Method Details

#call(x) ⇒ Object 



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# File 'lib/coo-coo/activation_functions.rb', line 316

def call(x)
  if x.respond_to?(:normalize)
    m = x.magnitude
    if m == 0.0
      0.0
    else
      x / magnitude
    end
  else
    x.coerce(0)
  end
end

#derivative(x, y = nil) ⇒ Object 



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# File 'lib/coo-coo/activation_functions.rb', line 329

def derivative(x, y = nil)
  mag = x.magnitude()
  if mag == 0.0
    0.0
  else
    y ||= call(x)
    1.0 / mag - y * y / mag
  end
end

#prep_output_target(x) ⇒ Object 



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# File 'lib/coo-coo/activation_functions.rb', line 339

def prep_output_target(x)
  x.normalize
end