auto gx_1 = Where3(scope, comparator, grad, zeros);
  auto gx_2 = Where3(scope, comparator, zeros, grad);
  return BinaryGradCommon(scope, op, grad_outputs, gx_1, gx_2);
}

Status MaximumGrad(const Scope& scope, const Operation& op,
                   const std::vector<Output>& grad_inputs,
                   std::vector<Output>* grad_outputs) {
  auto comparator = GreaterEqual(scope, op.input(0), op.input(1));