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: "optimal transmission policies for energy harvesting two hop networks"
  Abstract: In this paper, a two-hop communication system with energy harvesting nodes is considered. Unlike battery powered wireless nodes, both the source and the relay are able to harvest energy from environment during communication, therefore, both data and energy causality over the two hops need to be considered. Assuming both nodes know the harvested energies in advance, properties of optimal transmission policies to maximize the delivered data by a given deadline are identified. Using these properties, optimal power allocation and transmission schedule for the case in which both nodes harvest two energy packets is developed.

Connected through hyperedge HE-1 (induced by source paper "distributed user association in energy harvesting small cell networks a probabilistic bandit model"):
  with members:
    - "multi armed bandits with application to 5g small cells"
    - "user association in 5g networks a survey and an outlook"
    - "multi access communications with energy harvesting a multi armed bandit model and the optimality of the myopic policy"
    - "cooperative interference mitigation and handover management for heterogeneous cloud small cell networks"
    - "optimizing user association and spectrum allocation in hetnets a utility perspective"
    - "channel selection for network assisted d2d communication via no regret bandit learning with calibrated forecasting"
    - "a context aware matching game for user association in wireless small cell networks"
    - "matching theory for priority based cell association in the downlink of wireless small cell networks"

Connected through hyperedge HE-2 (induced by source paper "multi agent reinforcement learning for energy harvesting two hop communications with a partially observable state"):
  with members:
    - "multi access communications with energy harvesting a multi armed bandit model and the optimality of the myopic policy"
    - "iterative dynamic water filling for fading multiple access channels with energy harvesting"
    - "energy harvesting two hop communication networks"
    - "a learning theoretic approach to energy harvesting communication system optimization"
    - "optimal scheduling and power allocation for two hop energy harvesting communication systems"
    - "throughput optimal policies for energy harvesting wireless transmitters with non ideal circuit power"
    - "throughput maximization for an energy harvesting communication system with processing cost"
    - "optimal save then transmit protocol for energy harvesting wireless transmitters"

Connected through hyperedge HE-3 (induced by source paper "transmit power minimization for wireless networks with energy harvesting relays"):
  with members:
    - "energy harvesting wireless communications a review of recent advances"
    - "energy harvesting small cell networks feasibility deployment and operation"
    - "a lyapunov optimization approach for green cellular networks with hybrid energy supplies"
    - "power allocation for conventional and buffer aided link adaptive relaying systems with energy harvesting nodes"
    - "throughput maximization for the gaussian relay channel with energy harvesting constraints"
    - "optimal scheduling and power allocation for two hop energy harvesting communication systems"
    - "training optimization for energy harvesting communication systems"
    - "sum rate optimal power policies for energy harvesting transmitters in an interference channel"

Connected through hyperedge HE-4 (induced by source paper "energy harvesting wireless communications a review of recent advances"):
  with members:
    - "renewable powered cellular networks energy field modeling and network coverage"
    - "dynamic compression transmission for energy harvesting multihop networks with correlated sources"
    - "constrained codes for joint energy and information transfer"
    - "energy harvesting broadband communication systems with processing energy cost"
    - "spatial throughput of mobile ad hoc networks powered by energy harvesting"
    - "energy cooperation in energy harvesting communications"
    - "interactive joint transfer of energy and information"
    - "opportunistic wireless energy harvesting in cognitive radio networks"

Connected through hyperedge HE-5 (induced by source paper "optimal policies for wireless networks with energy harvesting transmitters and receivers effects of decoding costs"):
  with members:
    - "iterative dynamic water filling for fading multiple access channels with energy harvesting"
    - "convex separable problems with linear constraints in signal processing and communications"
    - "energy harvesting broadband communication systems with processing energy cost"
    - "energy cooperation in energy harvesting communications"
    - "throughput maximization for the gaussian relay channel with energy harvesting constraints"
    - "optimal scheduling and power allocation for two hop energy harvesting communication systems"
    - "throughput optimal policies for energy harvesting wireless transmitters with non ideal circuit power"
    - "training optimization for energy harvesting communication systems"

Connected through hyperedge HE-6 (induced by source paper "energy harvesting systems with continuous energy and data arrivals the optimal offline and a heuristic online algorithms"):
  with members:
    - "optimal offline and competitive online strategies for transmitter receiver energy harvesting"
    - "power allocation for energy harvesting transmitter with causal information"
    - "optimal power and rate allocation in the degraded gaussian relay channel with energy harvesting nodes"
    - "energy cooperation in energy harvesting communications"
    - "throughput maximization for the gaussian relay channel with energy harvesting constraints"
    - "optimal scheduling and power allocation for two hop energy harvesting communication systems"
    - "throughput optimal policies for energy harvesting wireless transmitters with non ideal circuit power"
    - "broadcasting with an energy harvesting rechargeable transmitter"

Connected through hyperedge HE-7 (induced by source paper "throughput maximization for two way relay channels with energy harvesting nodes the impact of relaying strategies"):
  with members:
    - "power allocation for conventional and buffer aided link adaptive relaying systems with energy harvesting nodes"
    - "throughput maximization for the gaussian relay channel with energy harvesting constraints"
    - "a learning theoretic approach to energy harvesting communication system optimization"
    - "optimal scheduling and power allocation for two hop energy harvesting communication systems"
    - "optimal save then transmit protocol for energy harvesting wireless transmitters"
    - "broadcasting with an energy harvesting rechargeable transmitter"
    - "sum rate optimal power policies for energy harvesting transmitters in an interference channel"
    - "two hop communication with energy harvesting"

Connected through hyperedge HE-8 (induced by source paper "an optimal transmission policy for energy harvesting systems with continuous energy and data arrivals"):
  with members:
    - "optimal offline and competitive online strategies for transmitter receiver energy harvesting"
    - "optimal power and rate allocation in the degraded gaussian relay channel with energy harvesting nodes"
    - "energy cooperation in energy harvesting communications"
    - "throughput maximization for the gaussian relay channel with energy harvesting constraints"
    - "optimal scheduling and power allocation for two hop energy harvesting communication systems"
    - "broadcasting with an energy harvesting rechargeable transmitter"
    - "two hop communication with energy harvesting"
    - "a general framework for the optimization of energy harvesting communication systems with battery imperfections"

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)