// Don't set any value field in the proto, since it is only going to be used
  // for shape inference.

  GraphDefBuilder::Options options(graph_out, /*status=*/nullptr);
  NodeBuilder node_builder(options.GetNameForOp("KnownShape"), "Const",
                           options.op_registry());
  node_builder.Attr("dtype", data_type).Attr("value", dummy_proto);
  Node* node = options.FinalizeBuilder(&node_builder);