const char* oper_name) {
  opts->opts.return_nodes.push_back(oper_name);
}

int TF_ImportGraphDefOptionsNumReturnOperations(
    const TF_ImportGraphDefOptions* opts) {
  return opts->opts.return_nodes.size();
}

void TF_ImportGraphDefResultsReturnOutputs(TF_ImportGraphDefResults* results,

  TF_ImportGraphDefOptionsAddReturnOutput(opts, "scalar", 0);
  EXPECT_EQ(2, TF_ImportGraphDefOptionsNumReturnOutputs(opts));
  TF_ImportGraphDefOptionsAddReturnOperation(opts, "scalar");
  EXPECT_EQ(1, TF_ImportGraphDefOptionsNumReturnOperations(opts));
  tensorflow::GraphDef graph_def_proto;
  ASSERT_TRUE(tensorflow::ParseProtoUnlimited(&graph_def_proto, graph_def->data,
                                              graph_def->length));