}

  // Populate return_tensors
  DCHECK(tf_results->return_tensors.empty());
  tf_results->return_tensors.resize(results.return_tensors.size());
  for (int i = 0; i < results.return_tensors.size(); ++i) {
    tf_results->return_tensors[i].oper =
        ToOperation(results.return_tensors[i].first);
    tf_results->return_tensors[i].index = results.return_tensors[i].second;
  }