nn/Sum.lua at legacy · dominikgrewe/nn

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

function Sum:__init(dimension)

parent.__init(self)

dimension = dimension or 1

self.dimension = dimension

end

function Sum:updateOutput(input)

if type(self.output) == 'number' then

self.output = input.new()

end

input.torch.sum(self.output, input, self.dimension)

self.output = self.output:select(self.dimension, 1)

return self.output

end

function Sum:updateGradInput(input, gradOutput)

local size = gradOutput:size():totable()

local stride = gradOutput:stride():totable()

table.insert(size, self.dimension, input:size(self.dimension))

table.insert(stride, self.dimension, 0)

self.gradInput:set(gradOutput:storage(),

torch.LongStorage(size),

torch.LongStorage(stride))

return self.gradInput

end