auto dx = internal::SoftplusGrad(scope, grad_inputs[0], op.input(0));
  grad_outputs->push_back(dx);
  return scope.status();
}
REGISTER_GRADIENT_OP("Softplus", SoftplusGradHelper);

Status SoftsignGradHelper(const Scope& scope, const Operation& op,
                          const std::vector<Output>& grad_inputs,
                          std::vector<Output>* grad_outputs) {