Class: DNN::Optimizers::AdaGrad

Inherits:
Object
  • Object
show all
Defined in:
lib/dnn/core/optimizers.rb

Instance Method Summary collapse

Constructor Details

#initialize(learning_rate = 0.01) ⇒ AdaGrad

Returns a new instance of AdaGrad.



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# File 'lib/dnn/core/optimizers.rb', line 46

def initialize(learning_rate = 0.01)
  super(learning_rate)
  @g = {}
end

Instance Method Details

#update(layer) ⇒ Object 



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# File 'lib/dnn/core/optimizers.rb', line 51

def update(layer)
  @g[layer] ||= {}
  layer.params.each_key do |key|
    @g[layer][key] ||= 0
    @g[layer][key] += layer.grads[key]**2
    layer.params[key] -= (@learning_rate / NMath.sqrt(@g[layer][key] + 1e-7)) * layer.grads[key]
  end
end