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: "the convergence of bird flocking"
  Abstract: We bound the time it takes for a group of birds to reach steady state in a standard flocking model. We prove that (i) within single exponential time fragmentation ceases and each bird settles on a fixed flying direction; (ii) the flocking network converges only after a number of steps that is an iterated exponential of height logarithmic in the number of birds. We also prove the highly surprising result that this bound is optimal. The model directs the birds to adjust their velocities repeatedly by averaging them with their neighbors within a fixed radius. The model is deterministic, but we show that it can tolerate a reasonable amount of stochastic or even adversarial noise. Our methods are highly general and we speculate that the results extend to a wider class of models based on undirected flocking networks, whether defined metrically or topologically. This work introduces new techniques of broader interest, including the "flight net," the "iterated spectral shift," and a certain "residue-clearing" argument in circuit complexity.

Connected through hyperedge HE-1 (induced by source paper "ares adaptive receding horizon synthesis of optimal plans"):
  with members:
    - "policy learning for time bounded reachability in continuous time markov decision processes via doubly stochastic gradient ascent"
    - "path integral policy improvement with covariance matrix adaptation"
    - "v like formations in flocks of artificial birds"
    - "experiments with infinite horizon policy gradient estimation"

Connected through hyperedge HE-2 (induced by source paper "amortized averaging algorithms for approximate consensus"):
  with members:
    - "approximate consensus in highly dynamic networks the role of averaging algorithms"
    - "orientation and connectivity based criteria for asymptotic consensus"
    - "optimal strategies in the average consensus problem"

Connected through hyperedge HE-3 (induced by source paper "coordinated robot navigation via hierarchical clustering"):
  with members:
    - "efficient multi robot motion planning for unlabeled discs in simple polygons"
    - "k color multi robot motion planning"

Connected through hyperedge HE-4 (induced by source paper "continuous time consensus under non instantaneous reciprocity"):
  with members:
    - "the role of persistent graphs in the agreement seeking of social networks"
    - "multi agent coordination using nearest neighbor rules revisiting the vicsek model"

Connected through hyperedge HE-5 (induced by source paper "convergence of type symmetric and cut balanced consensus seeking systems extended version"):
  with members:
    - "multi agent coordination using nearest neighbor rules revisiting the vicsek model"

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.CG(Computational Geometry)