options.allow_internal_ops = true;
  std::unique_ptr<Graph> graph(new Graph(lib_def.get()));
  s = ConvertGraphDefToGraph(options, *graphdef, graph.get());
  if (!s.ok()) return s;

  s = PerformStaticShapeInferenceBeforeEncapsulation(graph.get());
  if (!s.ok()) return s;

  // Create FunctionLibraryRuntime.
  SessionOptions session_options;
  std::vector<std::unique_ptr<Device>> devices;