}

        @Override
        public void setSessionId(String sessionId) {
            // Do nothing in test
        }

        @Override
        public void setRuleId(String ruleId) {
            // Do nothing in test
        }

        @Override
        public void setUrl(String url) {
            // Do nothing in test
        }

        @Override

}

}  // end extern "C"

namespace tensorflow {

void RecordMutation(TF_Graph* graph, const TF_Operation& op,
                    const char* mutation_type) {
  // If any session has already run this node_id, mark this session as
  // unrunnable.
  for (auto it : graph->sessions) {
    mutex_lock session_lock(it.first->mu);
    if (it.first->last_num_graph_nodes > op.node.id()) {
      it.second = strings::StrCat(