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: "when gravity fails local search topology"
  Abstract: Local search algorithms for combinatorial search problems frequently encounter a sequence of states in which it is impossible to improve the value of the objective function; moves through these regions, called plateau moves, dominate the time spent in local search. We analyze and characterize plateaus for three different classes of randomly generated Boolean Satisfiability problems. We identify several interesting features of plateaus that impact the performance of local search algorithms. We show that local minima tend to be small but occasionally may be very large. We also show that local minima can be escaped without unsatisfying a large number of clauses, but that systematically searching for an escape route may be computationally expensive if the local minimum is large. We show that plateaus with exits, called benches, tend to be much larger than minima, and that some benches have very few exit states which local search can use to escape. We show that the solutions (i.e., global minima) of randomly generated problem instances form clusters, which behave similarly to local minima. We revisit several enhancements of local search algorithms and explain their performance in light of our results. Finally we discuss strategies for creating the next generation of local search algorithms.

Connected through hyperedge HE-1 (induced by source paper "exploiting problem structure in combinatorial landscapes a case study on pure mathematics application"):
  with members:
    - "recursive decomposition for nonconvex optimization"
    - "phase transitions and backbones of the asymmetric traveling salesman problem"

Connected through hyperedge HE-2 (induced by source paper "local optima networks of nk landscapes with neutrality"):
  with members:
    - "the connectivity of nk landscapes basins a network analysis"
    - "a study of nk landscapes basins and local optima networks"
    - "fitness landscape of the cellular automata majority problem view from the olympus"
    - "scuba search when selection meets innovation"

Connected through hyperedge HE-3 (induced by source paper "the road to vegas guiding the search over neutral networks"):
  with members:
    - "nils a neutrality based iterated local search and its application to flowshop scheduling"
    - "on the neutrality of flowshop scheduling fitness landscapes"
    - "fitness landscape of the cellular automata majority problem view from the olympus"

Connected through hyperedge HE-4 (induced by source paper "structure and problem hardness goal asymmetry and dpll proofs in sat based planning"):
  with members:
    - "engineering benchmarks for planning the domains used in the deterministic part of ipc 4"
    - "where ignoring delete lists works local search topology in planning benchmarks"
    - "the deterministic part of ipc 4 an overview"
    - "beyond hypertree width decomposition methods without decompositions"
    - "ordered landmarks in planning"
    - "towards understanding and harnessing the potential of clause learning"
    - "the 3rd international planning competition results and analysis"
    - "planning through stochastic local search and temporal action graphs in lpg"

Connected through hyperedge HE-5 (induced by source paper "engineering benchmarks for planning the domains used in the deterministic part of ipc 4"):
  with members:
    - "supply restoration in power distribution systems a case study in integrating model based diagnosis and repair planning"
    - "the fast downward planning system"
    - "an approach to temporal planning and scheduling in domains with predictable exogenous events"
    - "where ignoring delete lists works local search topology in planning benchmarks"
    - "the deterministic part of ipc 4 an overview"
    - "taming numbers and durations in the model checking integrated planning system"
    - "pddl2 1 an extension to pddl for expressing temporal planning domains"
    - "the metric ff planning system translating ignoring delete lists to numeric state variables"

Connected through hyperedge HE-6 (induced by source paper "barriers and local minima in energy landscapes of stochastic local search"):
  with members:
    - "on the asymptotic weight and stopping set distribution of regular ldpc ensembles"
    - "on the solution space geometry of random constraint satisfaction problems"
    - "a new look at survey propagation and its generalizations"
    - "threshold values of random k sat from the cavity method"

Connected through hyperedge HE-7 (induced by source paper "understanding algorithm performance on an oversubscribed scheduling application"):
  with members:
    - "an indirect genetic algorithm for a nurse scheduling problem"
    - "backbone fragility and the local search cost peak"
    - "squeaky wheel optimization"

Connected through hyperedge HE-8 (induced by source paper "where ignoring delete lists works local search topology in planning benchmarks"):
  with members:
    - "engineering benchmarks for planning the domains used in the deterministic part of ipc 4"
    - "the deterministic part of ipc 4 an overview"
    - "taming numbers and durations in the model checking integrated planning system"
    - "the metric ff planning system translating ignoring delete lists to numeric state variables"
    - "the 3rd international planning competition results and analysis"
    - "planning through stochastic local search and temporal action graphs in lpg"
    - "the ff planning system fast plan generation through heuristic search"
    - "the grt planning system backward heuristic construction in forward state space planning"

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.AI(Artificial Intelligence)