Method ReleaseNode

tensorflow/core/graph/graph.cc:794–800

}

void Graph::ReleaseNode(Node* node) {
  TF_DCHECK_OK(IsValidNode(node)) << node->DebugString();
  nodes_[node->id()] = nullptr;
  free_nodes_.push_back(node);
  --num_nodes_;
  node->Clear();
}

// Ensures that 'device_name' is present in the device name table, and returns
// the index of that device name. The index is stable, and can be used in