Class: DNN::Layers::Dropout

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

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Layer

#build, #built?, #prev_layer, #shape

Constructor Details

#initialize(dropout_ratio = 0.5) ⇒ Dropout

Returns a new instance of Dropout.



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# File 'lib/dnn/core/layers.rb', line 225

def initialize(dropout_ratio = 0.5)
  super()
  @dropout_ratio = dropout_ratio
  @mask = nil
end

Instance Attribute Details

#dropout_ratio ⇒ Object (readonly)

Returns the value of attribute dropout_ratio.



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# File 'lib/dnn/core/layers.rb', line 219

def dropout_ratio
  @dropout_ratio
end

Class Method Details

.load_hash(hash) ⇒ Object 



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# File 'lib/dnn/core/layers.rb', line 221

def self.load_hash(hash)
  self.new(hash[:dropout_ratio])
end

Instance Method Details

#backward(dout) ⇒ Object 



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# File 'lib/dnn/core/layers.rb', line 241

def backward(dout)
  dout[@mask] = 0 if @model.training?
  dout
end

#forward(x) ⇒ Object 



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# File 'lib/dnn/core/layers.rb', line 231

def forward(x)
  if @model.training?
    @mask = SFloat.ones(*x.shape).rand < @dropout_ratio
    x[@mask] = 0
  else
    x *= (1 - @dropout_ratio)
  end
  x
end

#to_hash ⇒ Object 



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# File 'lib/dnn/core/layers.rb', line 246

def to_hash
  super({dropout_ratio: @dropout_ratio})
end