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: "software defined optical networks sdons a comprehensive survey"
  Abstract: The emerging software defined networking (SDN) paradigm separates the data plane from the control plane and centralizes network control in an SDN controller. Applications interact with controllers to implement network services, such as network transport with quality of service. SDN facilitates the virtualization of network functions so that multiple virtual networks can operate over a given installed physical network infrastructure. Due to the specific characteristics of optical (photonic) communication components and the high optical transmission capacities, SDN-based optical networking poses particular challenges, but holds also great potential. In this article, we comprehensively survey studies that examine the SDN paradigm in optical networks; in brief, we survey the area of software defined optical networks (SDONs). We mainly organize the SDON studies into studies focused on the infrastructure layer, the control layer, and the application layer. Moreover, we cover SDON studies focused on network virtualization, as well as SDON studies focused on the orchestration of multilayer and multidomain networking. Based on the survey, we identify open challenges for SDONs and outline future directions.

Connected through hyperedge HE-1 (induced by source paper "a survey of big data machine learning applications optimization in cloud data centers and networks"):
  with members:
    - "fog assisted caching employing solar renewable energy for delivering video on demand service"
    - "energy efficient and resilient infrastructure for fog computing health monitoring applications"
    - "virtual machines embedding for cloud pon awgr and server based data centres"
    - "a survey on geographically distributed big data processing using mapreduce"
    - "disaggregation for improved efficiency in fog computing era"
    - "experimental evaluation of server centric passive optical network based data centre architecture"
    - "energy efficient distributed processing in vehicular cloud architecture"
    - "energy efficient software matching in vehicular fog"

Connected through hyperedge HE-2 (induced by source paper "network service orchestration a survey"):
  with members:
    - "research challenges in nextgen service orchestration"
    - "network slicing for 5g with sdn nfv concepts architectures and challenges"
    - "understand your chains towards performance profile based network service management"
    - "sonata service programming and orchestration for virtualized software networks"
    - "network function virtualization state of the art and research challenges"
    - "survey of promising technologies for 5g networks"
    - "software defined networking a comprehensive survey"
    - "internet of things iot a vision architectural elements and future directions"

Connected through hyperedge HE-3 (induced by source paper "a survey of controller placement problem in software defined networks"):
  with members:
    - "lazyctrl scalable network control for cloud data centers"
    - "software defined networking a comprehensive survey"
    - "bandwidth aware scheduling with sdn in hadoop a new trend for big data"
    - "use of devolved controllers in data center networks"

Connected through hyperedge HE-4 (induced by source paper "a survey of energy efficiency in sdn software based methods and optimization models"):
  with members:
    - "dynamic environments for virtual machine placement considering elasticity and overbooking"
    - "network function virtualization state of the art and research challenges"
    - "software defined networking a comprehensive survey"

Connected through hyperedge HE-5 (induced by source paper "software defined networks based smart grid communication a comprehensive survey"):
  with members:
    - "response time and availability study of raft consensus in distributed sdn control plane"
    - "software defined microgrid control for resilience against cyber attacks"
    - "enabling hard service guarantees in software defined smart grid infrastructures"
    - "survey on network virtualization hypervisors for software defined networking"
    - "an iot architecture for wide area measurement systems a virtualized pmu based approach"
    - "iot cloud based distribution system state estimation virtual objects and context awareness"
    - "network function virtualization state of the art and research challenges"
    - "smart grid communications overview of research challenges solutions and standardization activities"

Connected through hyperedge HE-6 (induced by source paper "underwater optical wireless communications networking and localization a survey"):
  with members:
    - "end to end performance analysis of underwater optical wireless relaying and routing techniques under location uncertainty"
    - "performance analysis of connectivity and localization in multi hop underwater optical wireless sensor networks"
    - "communicating using spatial mode multiplexing potentials challenges and perspectives"
    - "on distributed routing in underwater optical wireless sensor networks"
    - "non orthogonal multiple access for visible light communications"
    - "performance characterization of relay assisted wireless optical cdma networks in turbulent underwater channel"
    - "connectivity scaling laws in wireless networks"
    - "extremal properties of three dimensional sensor networks with applications"

Connected through hyperedge HE-7 (induced by source paper "r fft function split at ifft fft in unified lte cran and cable access network"):
  with members:
    - "on the fronthaul statistical multiplexing gain"
    - "recent advances in cloud radio access networks system architectures key techniques and open issues"
    - "cluster content caching an energy efficient approach to improve quality of service in cloud radio access networks"
    - "statistical multiplexing gain analysis of heterogeneous virtual base station pools in cloud radio access networks"
    - "upstream polling protocols for flow control in pon xdsl hybrid access networks"
    - "green ofdma resource allocation in cache enabled cran"
    - "optimized configurable architectures for scalable soft input soft output mimo detectors with 256 qam"
    - "quantized massive mu mimo ofdm uplink"

Connected through hyperedge HE-8 (induced by source paper "bounds for energy efficient survivable ip over wdm networks with network coding"):
  with members:
    - "detour planning for fast and reliable failure recovery in sdn with openstate"
    - "network coding based protection strategy against node failures"
    - "network protection codes against link failures using network coding"

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.NI(Networking and Internet Architecture)