VLOG(2) << "# iterations = " << iterations;

  return absl::OkStatus();
}

// Sorts control inputs of a graphdef so that they are deterministically
// 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);