Function DecrementFaninCount

tensorflow/core/grappler/utils/graph_view.cc:444–455

}

inline void DecrementFaninCount(
    absl::flat_hash_map<internal::NodeDefAndPortIndex, int>* fanins_count,
    const internal::NodeDefAndPortIndex& fanin) {
  auto it = fanins_count->find(fanin);
  if (it != fanins_count->end()) {
    if (it->second <= 1) {
      fanins_count->erase(it);
    } else {
      --it->second;
    }
  }
}
}  // namespace

MutableGraphView::MutableGraphView(GraphDef* graph, Status* status)