chrishkchris commented on issue #488: SINGA -475 add Sign operator to singa URL: https://github.com/apache/incubator-singa/pull/488#issuecomment-519866518 This is what tensorflow use: ```cpp Status SignGrad(const Scope& scope, const Operation& op, const std::vector<Output>& grad_inputs, std::vector<Output>* grad_outputs) { auto shape = Shape(scope, op.input(0)); auto zero = Cast(scope, Const(scope, 0.0), op.input(0).type()); auto dx = Fill(scope, shape, zero); grad_outputs->push_back(dx); return scope.status(); } REGISTER_GRADIENT_OP("Sign", SignGrad); ``` seems to fill the dx with all zero
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