}

  void VerifyFDefInputs(const tensorflow::FunctionDef& fdef,
                        const std::vector<IOSpec>& inputs) {
    const OpDef& signature = fdef.signature();
    ASSERT_EQ(inputs.size(), signature.input_arg_size());
    for (int i = 0; i < inputs.size(); ++i) {
      const OpDef::ArgDef& arg = signature.input_arg(i);
      const IOSpec& in = inputs[i];
      if (in.second != DT_INVALID) {