nn/CSubTable.lua at fb · dominikgrewe/nn

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

function CSubTable:__init()

parent.__init(self)

self.gradInput = {}

end

function CSubTable:updateOutput(input)

self.output:resizeAs(input[1]):copy(input[1])

self.output:add(-1,input[2])

return self.output

end

function CSubTable:updateGradInput(input, gradOutput)

self.gradInput[1] = self.gradInput[1] or input[1].new()

self.gradInput[2] = self.gradInput[2] or input[1].new()

self.gradInput[1]:resizeAs(input[1]):copy(gradOutput)

self.gradInput[2]:resizeAs(input[2]):copy(gradOutput):mul(-1)

return self.gradInput

end