return -1;
  }
  return iter->second.second - iter->second.first;
}

TF_Output TF_OperationInput(TF_Input oper_in) {
  const tensorflow::Edge* edge;
  Status s = oper_in.oper->node.input_edge(oper_in.index, &edge);
  if (!s.ok()) {
    return {nullptr, -1};
  }

  return {ToOperation(edge->src()), edge->src_output()};
}

    TFE_TensorHandle* input_eager = TestScalarTensorHandle(eager_ctx, 2.0f);
    func_args.push_back(TF_CreateAbstractTensorFromEagerTensor(input_eager, s));
    ASSERT_EQ(TF_OK, TF_GetCode(s)) << TF_Message(s);
    input_eager = TestScalarTensorHandle(eager_ctx, 3.0f);
    func_args.push_back(TF_CreateAbstractTensorFromEagerTensor(input_eager, s));
    ASSERT_EQ(TF_OK, TF_GetCode(s)) << TF_Message(s);
  }