Class: DNN::Layers::Dropout

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

Instance Attribute Summary collapse

Attributes inherited from Layer

#input_shape

Instance Method Summary collapse

Methods inherited from Layer

#build, #built?, #call, call, #clean, from_hash, #output_shape

Constructor Details

#initialize(dropout_ratio = 0.5, seed: rand(1 << 31), use_scale: true) ⇒ Dropout 



355
356
357
358
359
360
361
362
 
# File 'lib/dnn/core/layers/basic_layers.rb', line 355

def initialize(dropout_ratio = 0.5, seed: rand(1 << 31), use_scale: true)
  super()
  @dropout_ratio = dropout_ratio
  @seed = seed
  @use_scale = use_scale
  @mask = nil
  @rnd = Random.new(@seed)
end

Instance Attribute Details

#dropout_ratio ⇒ Object

Returns the value of attribute dropout_ratio.



349
350
351
 
# File 'lib/dnn/core/layers/basic_layers.rb', line 349

def dropout_ratio
  @dropout_ratio
end

#use_scale ⇒ Object (readonly)

Returns the value of attribute use_scale.



350
351
352
 
# File 'lib/dnn/core/layers/basic_layers.rb', line 350

def use_scale
  @use_scale
end

Instance Method Details

#backward(dy) ⇒ Object 



375
376
377
378
 
# File 'lib/dnn/core/layers/basic_layers.rb', line 375

def backward(dy)
  dy[@mask] = 0
  dy
end

#forward(x) ⇒ Object 



364
365
366
367
368
369
370
371
372
373
 
# File 'lib/dnn/core/layers/basic_layers.rb', line 364

def forward(x)
  if DNN.learning_phase
    Xumo::SFloat.srand(@rnd.rand(1 << 31))
    @mask = Xumo::SFloat.new(*x.shape).rand < @dropout_ratio
    x[@mask] = 0
  elsif @use_scale
    x *= (1 - @dropout_ratio)
  end
  x
end

#load_hash(hash) ⇒ Object 



384
385
386
 
# File 'lib/dnn/core/layers/basic_layers.rb', line 384

def load_hash(hash)
  initialize(hash[:dropout_ratio], seed: hash[:seed], use_scale: hash[:use_scale])
end

#to_hash ⇒ Object 



380
381
382
 
# File 'lib/dnn/core/layers/basic_layers.rb', line 380

def to_hash
  super(dropout_ratio: @dropout_ratio, seed: @seed, use_scale: @use_scale)
end