Class: NN::Identity

Inherits:
Object
  • Object
show all
Includes:
Numo
Defined in:
lib/nn.rb

Instance Method Summary collapse

Constructor Details

#initialize(nn) ⇒ Identity

Returns a new instance of Identity.



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# File 'lib/nn.rb', line 338

def initialize(nn)
  @nn = nn
end

Instance Method Details

#backward(y) ⇒ Object 



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# File 'lib/nn.rb', line 346

def backward(y)
  @out - y
end

#forward(x) ⇒ Object 



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# File 'lib/nn.rb', line 342

def forward(x)
  @out = x
end

#loss(y) ⇒ Object 



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# File 'lib/nn.rb', line 350

def loss(y)
  ridge = 0.5 * @nn.weight_decay * @nn.weights.reduce(0){|sum, weight| sum + (weight ** 2).sum}
  0.5 * ((@out - y) ** 2).sum / @nn.batch_size + ridge
end