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: "big city 3d visual analysis"
  Abstract: A big city visual analysis platform based on Web Virtual Reality Geographical Information System (WEBVRGIS) is presented. Extensive model editing functions and spatial analysis functions are available, including terrain analysis, spatial analysis, sunlight analysis, traffic analysis, population analysis and community analysis.

Connected through hyperedge HE-1 (induced by source paper "touch less interactive augmented reality game on vision based wearable device"):
  with members:
    - "webvrgis based city bigdata 3d visualization and analysis"
    - "preprint a game based assistive tool for rehabilitation of dysphonic patients"
    - "serious game based dysphonic rehabilitation tool"
    - "a game based assistive tool for rehabilitation of dysphonic patients"
    - "evaluation of pervasive games recruitment of qualified participants through preparatory game phases"

Connected through hyperedge HE-2 (induced by source paper "preprint touch less interactive augmented reality game on vision based wearable device"):
  with members:
    - "webvrgis based city bigdata 3d visualization and analysis"
    - "serious game based dysphonic rehabilitation tool"
    - "a game based assistive tool for rehabilitation of dysphonic patients"
    - "evaluation of pervasive games recruitment of qualified participants through preparatory game phases"

Connected through hyperedge HE-3 (induced by source paper "preprint virtual geographic environment based coach passenger flow forecasting"):
  with members:
    - "webvrgis based city bigdata 3d visualization and analysis"
    - "a game based assistive tool for rehabilitation of dysphonic patients"
    - "3d visual analysis of seabed on smartphone"

Connected through hyperedge HE-4 (induced by source paper "preprint virtual reality based gis analysis platform"):
  with members:
    - "regularized maximum correntropy machine"

Connected through hyperedge HE-5 (induced by source paper "virtual reality gis and cloud service based traffic analysis platform"):
  with members:
    - "webvrgis based city bigdata 3d visualization and analysis"

Connected through hyperedge HE-6 (induced by source paper "preprint virtual reality gis and cloud service based traffic analysis platform"):
  with members:
    - "webvrgis based city bigdata 3d visualization and analysis"

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.GR(Graphics)