//        |         |
    //      Const_0    Const_1
    //
    const float const0_val[] = {1.0, 2.0, 3.0, 4.0};
    const float const1_val[] = {1.0, 0.0, 0.0, 1.0};
    TF_Operation* const0 = FloatConst2x2(graph_, s_, const0_val, "Const_0");
    TF_Operation* const1 = FloatConst2x2(graph_, s_, const1_val, "Const_1");
    TF_Operation* matmul = MatMul(graph_, s_, const0, const1, "MatMul");

      root_dir_ = tensorflow::strings::StrCat(
          "/", tmp_dir_,
          tensorflow::strings::StrCat("tf_fs_", rng_val_, "_", test_name), "/");
    } else {
      root_dir_ = tensorflow::io::JoinPath(
          tmp_dir_,
          tensorflow::strings::StrCat("tf_fs_", rng_val_, "_", test_name));
    }
    if (!GetParam().empty()) {
      root_dir_ = tensorflow::strings::StrCat(GetParam(), "://", cloud_path_,