VLOG(4) << "Visiting " << curr_node->name();
    order->push_back(curr_node);

    for (const Edge* out_edge : curr_node->out_edges()) {
      Node* out = out_edge->dst();
      int out_id = out->id();
      if (IsNextIteration(curr_node) && IsMerge(out)) {
        // Edge NextIteration->Merge has been counted.
        continue;
      }
      ++num_ready_inputs[out->id()];

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