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: "improved approximation for 3 dimensional matching via bounded pathwidth local search"
  Abstract: One of the most natural optimization problems is the k-Set Packing problem, where given a family of sets of size at most k one should select a maximum size subfamily of pairwise disjoint sets. A special case of 3-Set Packing is the well known 3-Dimensional Matching problem. Both problems belong to the Karp`s list of 21 NP-complete problems. The best known polynomial time approximation ratio for k-Set Packing is (k + eps)/2 and goes back to the work of Hurkens and Schrijver [SIDMA`89], which gives (1.5 + eps)-approximation for 3-Dimensional Matching. Those results are obtained by a simple local search algorithm, that uses constant size swaps. #R##N#The main result of the paper is a new approach to local search for k-Set Packing where only a special type of swaps is considered, which we call swaps of bounded pathwidth. We show that for a fixed value of k one can search the space of r-size swaps of constant pathwidth in c^r poly(|F|) time. Moreover we present an analysis proving that a local search maximum with respect to O(log |F|)-size swaps of constant pathwidth yields a polynomial time (k + 1 + eps)/3-approximation algorithm, improving the best known approximation ratio for k-Set Packing. In particular we improve the approximation ratio for 3-Dimensional Matching from 3/2 + eps to 4/3 + eps.

Connected through hyperedge HE-1 (induced by source paper "approximate multi matroid intersection via iterative refinement"):
  with members:
    - "generalized hypergraph matching via iterated packing and local ratio"
    - "matroidal degree bounded minimum spanning trees"
    - "submodular function maximization via the multilinear relaxation and contention resolution schemes"
    - "robust and maxmin optimization under matroid and knapsack uncertainty sets"
    - "constrained non monotone submodular maximization offline and secretary algorithms"
    - "on generalizations of network design problems with degree bounds"

Connected through hyperedge HE-2 (induced by source paper "a fast approximation scheme for low dimensional k means"):
  with members:
    - "tight analysis of a multiple swap heuristic for budgeted red blue median"
    - "new frameworks for offline and streaming coreset constructions"
    - "better guarantees for k means and euclidean k median by primal dual algorithms"
    - "local search yields a ptas for k means in doubling metrics"
    - "on variants of k means clustering"
    - "optimal parameterized algorithms for planar facility location problems using voronoi diagrams"
    - "a bi criteria approximation algorithm for k means"
    - "the hardness of approximation of euclidean k means"

Connected through hyperedge HE-3 (induced by source paper "stability and recovery for independence systems"):
  with members:
    - "k center clustering under perturbation resilience"
    - "computational feasibility of clustering under clusterability assumptions"
    - "the unreasonable success of local search geometric optimization"
    - "bilu linial stable instances of max cut and minimum multiway cut"
    - "large neighborhood local search for the maximum set packing problem"
    - "clustering is difficult only when it does not matter"
    - "on the practically interesting instances of maxcut"
    - "nash equilibria in perturbation resilient games"

Connected through hyperedge HE-4 (induced by source paper "inapproximability of h transversal packing"):
  with members:
    - "pre reduction graph products hardnesses of properly learning dfas and approximating edp on dags"
    - "characterizing the easy to find subgraphs from the viewpoint of polynomial time algorithms kernels and turing kernels"
    - "packing interval graphs with vertex disjoint triangles"
    - "hardness of vertex deletion and project scheduling"
    - "directed subset feedback vertex set is fixed parameter tractable"
    - "subset feedback vertex set is fixed parameter tractable"
    - "a new multilayered pcp and the hardness of hypergraph vertex cover"

Connected through hyperedge HE-5 (induced by source paper "parameterized approximation algorithms for packing problems"):
  with members:
    - "representative sets of product families"
    - "representative families a unified tradeoff based approach"
    - "mixing color coding related techniques"
    - "efficient computation of representative sets with applications in parameterized and exact algorithms"
    - "narrow sieves for parameterized paths and packings"
    - "determinant sums for undirected hamiltonicity"

Connected through hyperedge HE-6 (induced by source paper "finding perfect matchings in bipartite hypergraphs"):
  with members:
    - "combinatorial algorithm for restricted max min fair allocation"
    - "large neighborhood local search for the maximum set packing problem"
    - "navigating central path with electrical flows from flows to matchings and back"
    - "quasi polynomial local search for restricted max min fair allocation"
    - "santa claus schedules jobs on unrelated machines"
    - "new constructive aspects of the lovasz local lemma"

Connected through hyperedge HE-7 (induced by source paper "greedy matching guarantees and limitations"):
  with members:
    - "set merging for the matching algorithm of micali and vazirani"
    - "on the approximation performance of degree heuristics for matching"
    - "a simplication of the mv matching algorithm and its proof"
    - "ranking on arbitrary graphs rematch via continuous lp with monotone and boundary condition constraints"
    - "matching with our eyes closed"

Connected through hyperedge HE-8 (induced by source paper "the minimum feasible tileset problem"):
  with members:
    - "twins in subdivision drawings of hypergraphs"
    - "large neighborhood local search for the maximum set packing problem"
    - "kernelization of packing problems"

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.DS(Data Structures and Algorithms)