TF_EXCLUSIVE_LOCKS_REQUIRED(desc->graph->mu) {
  Node* ret = nullptr;

  if (desc->graph->name_map.count(desc->node_builder.node_name())) {
    status->status = InvalidArgument("Duplicate node name in graph: '",
                                     desc->node_builder.node_name(), "'");
  } else {
    if (!desc->colocation_constraints.empty()) {
      desc->node_builder.Attr(
          tensorflow::kColocationAttrName,