grad_outputs->push_back(Conj(scope, grad_inputs[0]));
  return scope.status();
}
REGISTER_GRADIENT_OP("Conj", ConjGrad);

// Integer division x / y, assuming x and y >=0, but treats x/0 = x
Output SafeDivHelper(const Scope& scope, const Output& x, const Output& y) {
  return Div(scope, x, Maximum(scope, y, Const(scope, 1)));
}

// SumGradHelper returns the gradient for the Sum operator, and is used