[GitHub] [incubator-singa] chrishkchris commented on issue #488: SINGA -475 add Sign operator to singa

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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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