Class: DNN::Layers::Sum

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

Instance Attribute Summary

Attributes inherited from Layer

#input_shape

Instance Method Summary collapse

Methods included from LayerNode

#backward, #forward

Methods inherited from Layer

#build, #built?, #call, call, #clean, #forward, from_hash, #load_hash, #output_shape, #to_hash

Constructor Details

#initialize(axis: 0) ⇒ Sum

Returns a new instance of Sum.



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# File 'lib/dnn/core/layers/math_layers.rb', line 119

def initialize(axis: 0)
  super()
  @axis = axis
end

Instance Method Details

#backward_node(dy) ⇒ Object 



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# File 'lib/dnn/core/layers/math_layers.rb', line 133

def backward_node(dy)
  dx = dy.clone
  if @axis
    (@dim - 1).times do
      dx = dx.concatenate(dy, axis: @axis)
    end
  end
  dx
end

#forward_node(x) ⇒ Object 



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# File 'lib/dnn/core/layers/math_layers.rb', line 124

def forward_node(x)
  if @axis
    @dim = x.shape[@axis]
    x.sum(axis: @axis, keepdims: true)
  else
    x.sum
  end
end