'Apply the backward pass transformation to the input data.
Arguments:
error (Tensor): deltas back propagated from the adjacent higher layer
Returns:
Tensor: deltas to propagate to the adjacent lower layer'

def bprop(self, error):

    if self.deltas:
        self.be.bprop_lrn(self.nglayer, self.inputs, self.outputs, error, self.deltas, self.denom, self.alpha, self.beta, self.ascale, self.bpower)
    return self.deltas
