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: "cooperative local caching and file sharing under heterogeneous file preferences"
  Abstract: Wireless device-to-device (D2D) caching has been recently introduced as an effective scheme for reducing the average download delay of mobile terminals (MTs) in cellular network. Specifically, the MTs first cache popular files in their local memories in off-peak hours and then exchange the requested files with each other in the vicinity via D2D communications during the peak hours. Prior works largely overlook MTs' heterogeneity in file preferences and their selfish behaviors. In this paper, we practically categorize the MTs into different interest groups according to their individual file preferences and jointly investigate each group's caching strategies to reduce the average file download delay. By modeling MTs' mobilities as homogeneous Poisson point processes (HPPPs), we analytically characterize MTs' average download delay in closed-form. We first consider the fully cooperative case where a centralizer helps all MT groups to make caching decisions. We formulate the problem as a weighted sum delay minimization problem, through which the minimum delay trade-offs of different groups are characterized. Next, we study two benchmark cases under selfish caching, namely, partial and no cooperation, with and without inter-group file sharing, respectively. The optimal caching distributions for these two cases are derived. Finally, extensive numerical examples are presented to compare the delay performances of different schemes and show the effectiveness of the cooperative D2D caching compared to the two benchmark cases.

Connected through hyperedge HE-1 (induced by source paper "caching policy optimization for d2d communications by learning user preference"):
  with members:
    - "caching at the wireless edge design aspects challenges and future directions"
    - "wireless device to device caching networks basic principles and system performance"
    - "energy saving pushing based on personal interest and context information"
    - "placing dynamic content in caches with small population"
    - "a provably efficient online collaborative caching algorithm for multicell coordinated systems"
    - "optimal geographic caching in cellular networks"
    - "learning based optimization of cache content in a small cell base station"
    - "living on the edge the role of proactive caching in 5g wireless networks"

Connected through hyperedge HE-2 (induced by source paper "coded caching clusters with device to device communications"):
  with members:
    - "mobility increases the data offloading ratio in d2d caching networks"
    - "on consideration of content preference and sharing willingness in d2d assisted offloading"
    - "spatially correlated content caching for device to device communications"
    - "fundamentals of cluster centric content placement in cache enabled device to device networks"
    - "optimal geographic caching in finite wireless networks"
    - "wireless device to device caching networks basic principles and system performance"
    - "wireless content caching for small cell and d2d networks"
    - "energy costs for traffic offloading by cache enabled d2d communications"

Connected through hyperedge HE-3 (induced by source paper "green ofdma resource allocation in cache enabled cran"):
  with members:
    - "fronthaul limited uplink ofdma in ultra dense cran with hybrid decoding"
    - "joint millimeter wave fronthaul and ofdma resource allocation in ultra dense cran"
    - "joint optimization of cloud and edge processing for fog radio access networks"
    - "energy efficiency of downlink transmission strategies for cloud radio access networks"
    - "content centric sparse multicast beamforming for cache enabled cloud ran"
    - "wireless communications in the era of big data"
    - "group sparse beamforming for green cloud ran"
    - "mixed timescale precoding and cache control in cached mimo interference network"

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.IT(Information Theory)