human: Given a node-centered hypergraph: <hypergraph>, where nodes represent papers and hyperedges represent sets of papers co-cited by a source paper.

Details of the hypergraph:
Center node: "empirical evidence of large scale diversity in api usage of object oriented software"
  Abstract: In this paper, we study how object-oriented classes are used across thousands of software packages. We concentrate on “usage diversity”, defined as the different statically observable combinations of methods called on the same object. We present empirical evidence that there is a significant usage diversity for many classes. For instance, we observe in our dataset that Java's String is used in 2460 manners. We discuss the reasons of this observed diversity and the consequences on software engineering knowledge and research.

Connected through hyperedge HE-1 (induced by source paper "analyzing 2 3 million maven dependencies to reveal an essential core in apis"):
  with members:
    - "the emergence of software diversity in maven central"
    - "vulnerable open source dependencies counting those that matter"
    - "an empirical comparison of dependency network evolution in seven software packaging ecosystems"
    - "learning api usages from bytecode a statistical approach"

Connected through hyperedge HE-2 (induced by source paper "a4 automatically assisting android api migrations using code examples"):
  with members:
    - "the android update problem an empirical study"
    - "mdroid a mutation testing framework for android"

Connected through hyperedge HE-3 (induced by source paper "bridging ecology and cloud transposing ecological prespective to enable better cloud autoscaling"):
  with members:
    - "online qos modeling in the cloud a hybrid and adaptive multi learners approach"
    - "the handbook of engineering self aware and self expressive systems"
    - "ecosystem oriented distributed evolutionary computing"

Connected through hyperedge HE-4 (induced by source paper "the multiple facets of software diversity recent developments in year 2000 and beyond"):
  with members:
    - "tailored source code transformations to synthesize computationally diverse program variants"
    - "software mutational robustness"

Question: Please tell me which class the center node belongs to. The 40 classes are: cs.NA(Numerical Analysis), cs.MM(Multimedia), cs.LO(Logic in Computer Science), cs.CY(Computers and Society), cs.CR(Cryptography and Security), cs.DC(Distributed, Parallel, and Cluster Computing), cs.HC(Human-Computer Interaction), cs.CE(Computational Engineering, Finance, and Science), cs.NI(Networking and Internet Architecture), cs.CC(Computational Complexity), cs.AI(Artificial Intelligence), cs.MA(Multiagent Systems), cs.GL(General Literature), cs.NE(Neural and Evolutionary Computing), cs.SC(Symbolic Computation), cs.AR(Hardware Architecture), cs.CV(Computer Vision and Pattern Recognition), cs.GR(Graphics), cs.ET(Emerging Technologies), cs.SY(Systems and Control), cs.CG(Computational Geometry), cs.OH(Other Computer Science), cs.PL(Programming Languages), cs.SE(Software Engineering), cs.LG(Machine Learning), cs.SD(Sound), cs.SI(Social and Information Networks), cs.RO(Robotics), cs.IT(Information Theory), cs.PF(Performance), cs.CL(Computation and Language), cs.IR(Information Retrieval), cs.MS(Mathematical Software), cs.FL(Formal Languages and Automata Theory), cs.DS(Data Structures and Algorithms), cs.OS(Operating Systems), cs.GT(Computer Science and Game Theory), cs.DB(Databases), cs.DL(Digital Libraries), cs.DM(Discrete Mathematics). Directly output the class name.

gpt: cs.SE(Software Engineering)