// ordered.
void SortControlInputs(GraphDef* gdef) {
  int64_t num_nodes = gdef->node_size();
  for (int64_t i = 0; i < num_nodes; ++i) {
    NodeDef* node = gdef->mutable_node(i);
    // Stable sort control inputs and leave the order of data inputs unchanged.
    std::stable_sort(node->mutable_input()->begin(),
                     node->mutable_input()->end(),

    auto& attr = iter.second;
    if (attr.has_func()) {
      try_use_original_func_name(attr.mutable_func()->mutable_name());
    } else if (attr.has_list()) {
      for (auto& func_attr : *attr.mutable_list()->mutable_func()) {
        try_use_original_func_name(func_attr.mutable_name());
      }
    }
  }
}

Status Exporter::AddInstructionNode(Operation* inst) {
  std::unique_ptr<NodeDef> node_def;

    auto& attr = iter.second;
    if (attr.has_func()) {
      try_use_original_func_name(attr.mutable_func()->mutable_name());
    } else if (attr.has_list()) {
      for (auto& func_attr : *attr.mutable_list()->mutable_func()) {
        try_use_original_func_name(func_attr.mutable_name());
      }
    }
  }
}

Status Exporter::AddInstructionNode(Operation* inst) {
  std::unique_ptr<NodeDef> node_def;