REGISTER_NO_GRADIENT_OP("NonMaxSuppressionV2");
REGISTER_NO_GRADIENT_OP("NonMaxSuppressionV3");
REGISTER_NO_GRADIENT_OP("NonMaxSuppressionV4");
REGISTER_NO_GRADIENT_OP("NonMaxSuppressionV5");

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