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local DotProduct, parent = torch.class('nn.DotProduct', 'nn.Module')
function DotProduct:__init()
parent.__init(self)
self.gradInput = {torch.Tensor(), torch.Tensor()}
self.output=torch.Tensor(1)
end
function DotProduct:updateOutput(input,y)
self.output[1] = input[1]:dot(input[2])
return self.output
end
function DotProduct:updateGradInput(input, gradOutput)
local v1 = input[1]
local v2 = input[2]
local gw1=self.gradInput[1];
local gw2=self.gradInput[2];
gw1:resizeAs(v1)
gw2:resizeAs(v1)
gw1:copy( v2)
gw1:mul(gradOutput[1])
gw2:copy( v1)
gw2:mul(gradOutput[1])
return self.gradInput
end
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