Class: Chainer::Functions::Array::Assign

Inherits:
Chainer::FunctionNode show all
Defined in:
lib/chainer/functions/array/select_item.rb

Instance Attribute Summary

Attributes inherited from Chainer::FunctionNode

#inputs, #outputs, #rank

Instance Method Summary collapse

Methods inherited from Chainer::FunctionNode

#apply, #backward_accumulate, #forward_cpu, #get_retained_inputs, #get_retained_outputs, #label, #output_data, #retain_inputs, #retain_outputs, #unchain

Constructor Details

#initialize(shape, dtype, t) ⇒ Assign

Returns a new instance of Assign.



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# File 'lib/chainer/functions/array/select_item.rb', line 48

def initialize(shape, dtype, t)
  @shape = shape
  @dtype = dtype
  @t = t.data
end

Instance Method Details

#backward(indexes, gy) ⇒ Object 



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# File 'lib/chainer/functions/array/select_item.rb', line 66

def backward(indexes, gy)
  SelectItem.new.apply([gy[0], @t])
end

#forward(inputs) ⇒ Object 



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# File 'lib/chainer/functions/array/select_item.rb', line 54

def forward(inputs)
  gx = @dtype.zeros(*@shape)

  # TODO: gx[six.moves.range(self.t.size), self.t] = inputs[0]
  # binding.pry
  @t.size.times.each do |i|
    gx[i, @t[i]] = inputs[0][i]
  end

  [gx]
end