const float const0_val[] = {1.0, 2.0, 3.0, 4.0};
    TF_Operation* const0 = FloatConst2x2(graph_, s_, const0_val, "Const_0");
    TF_Operation* nograd = NoGradientOp(graph_, s_, const0, "NoGrad");
    inputs[0] = TF_Output{const0, 0};
    outputs[0] = TF_Output{nograd, 0};
    EXPECT_EQ(TF_OK, TF_GetCode(s_)) << TF_Message(s_);
  }

  void BuildSuccessGraph(TF_Output* inputs, TF_Output* outputs) {

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