CAddTable.lua


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local CAddTable, parent = torch.class('nn.CAddTable', 'nn.Module')

function CAddTable:__init()
   parent.__init(self)
   self.gradInput = {}
end

function CAddTable:forward(input)
   self.output:resizeAs(input[1]):copy(input[1])
   for i=2,#input do
      self.output:add(input[i])
   end
   return self.output
end

function CAddTable:backward(input, gradOutput)
   for i=1,#input do
      self.gradInput[i] = self.gradInput[i] or torch.Tensor()
      self.gradInput[i]:resizeAs(input[i])
      self.gradInput[i]:copy(gradOutput)
   end
   return self.gradInput
end

function CAddTable:write(file)
   parent.write(self, file)
end

function CAddTable:read(file)
   parent.read(self, file)
   self.gradInput = {}
end