.SetIsAggregate();

Node* Sequencer(const GraphDefBuilder::Options& opts,
                const string& call_node_name) {
  if (opts.HaveError()) return nullptr;
  NodeBuilder node_builder(opts.GetNameForOp("NoOp"), "NoOp",
                           opts.op_registry());
  return opts.WithAttr(kXlaHostTransferSequencerAttr, call_node_name)
      .FinalizeBuilder(&node_builder);
}