opts->tensor_id_data.push_back(oper_name);
  const string& oper_name_str = opts->tensor_id_data.back();
  opts->opts.return_tensors.emplace_back(oper_name_str, index);
}

int TF_ImportGraphDefOptionsNumReturnOutputs(
    const TF_ImportGraphDefOptions* opts) {
  return opts->opts.return_tensors.size();
}

void TF_ImportGraphDefOptionsAddReturnOperation(TF_ImportGraphDefOptions* opts,