TfLiteRegistration* Register_SUB_REF() {
  static TfLiteRegistration r = {sub::Init, sub::Free, sub::Prepare,
                                 sub::Eval<sub::kReference>};
  return &r;
}
TfLiteRegistration* Register_SUB_REF() {
  static TfLiteRegistration r = {sub::Init, sub::Free, sub::Prepare,
                                 sub::Eval<sub::kReference>};
  return &r;
}