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: "a polylogarithimic approximation algorithm for edge disjoint paths with congestion 2"
  Abstract: In the Edge-Disjoint Paths with Congestion problem (EDPwC), we are given an undirected n-vertex graph G, a collection M={(s_1,t_1),...,(s_k,t_k)} of demand pairs and an integer c. The goal is to connect the maximum possible number of the demand pairs by paths, so that the maximum edge congestion - the number of paths sharing any edge - is bounded by c. When the maximum allowed congestion is c=1, this is the classical Edge-Disjoint Paths problem (EDP). #R##N#The best current approximation algorithm for EDP achieves an $O(\sqrt n)$-approximation, by rounding the standard multi-commodity flow relaxation of the problem. This matches the $\Omega(\sqrt n)$ lower bound on the integrality gap of this relaxation. We show an $O(poly log k)$-approximation algorithm for EDPwC with congestion c=2, by rounding the same multi-commodity flow relaxation. This gives the best possible congestion for a sub-polynomial approximation of EDPwC via this relaxation. Our results are also close to optimal in terms of the number of pairs routed, since EDPwC is known to be hard to approximate to within a factor of $\tilde{\Omega}((\log n)^{1/(c+1)})$ for any constant congestion c. Prior to our work, the best approximation factor for EDPwC with congestion 2 was $\tilde O(n^{3/7})$, and the best algorithm achieving a polylogarithmic approximation required congestion 14.

Connected through hyperedge HE-1 (induced by source paper "packing directed circuits quarter integrally"):
  with members:
    - "routing symmetric demands in directed minor free graphs with constant congestion"
    - "the directed grid theorem"
    - "large treewidth graph decompositions and applications"
    - "polynomial bounds for the grid minor theorem"

Connected through hyperedge HE-2 (induced by source paper "routing symmetric demands in directed minor free graphs with constant congestion"):
  with members:
    - "improved approximation for node disjoint paths in planar graphs"

Connected through hyperedge HE-3 (induced by source paper "new algorithms for maximum disjoint paths based on tree likeness"):
  with members:
    - "new hardness results for routing on disjoint paths"
    - "improved approximation for node disjoint paths in planar graphs"
    - "on routing disjoint paths in bounded treewidth graphs"
    - "maximum edge disjoint paths in k sums of graphs"
    - "routing in undirected graphs with constant congestion"
    - "flow cut gaps for integer and fractional multiflows"

Connected through hyperedge HE-4 (induced by source paper "improved bounds for the excluded grid theorem"):
  with members:
    - "maximum edge disjoint paths in k sums of graphs"
    - "polynomial bounds for the grid minor theorem"
    - "routing in undirected graphs with constant congestion"

Connected through hyperedge HE-5 (induced by source paper "routing with congestion in acyclic digraphs"):
  with members:
    - "congestion free rerouting of flows on dags"
    - "vertex disjoint path in upward planar graphs"
    - "the planar directed k vertex disjoint paths problem is fixed parameter tractable"

Connected through hyperedge HE-6 (induced by source paper "new hardness results for routing on disjoint paths"):
  with members:
    - "improved approximation for node disjoint paths in planar graphs"
    - "routing in undirected graphs with constant congestion"

Connected through hyperedge HE-7 (induced by source paper "improved approximation for node disjoint paths in planar graphs"):
  with members:
    - "routing in undirected graphs with constant congestion"
    - "the hardness of routing two pairs on one face"

Connected through hyperedge HE-8 (induced by source paper "the inapproximability of maximum single sink unsplittable priority and confluent flow problems"):
  with members:
    - "a constant factor approximation algorithm for unsplittable flow on paths"
    - "routing in undirected graphs with constant congestion"

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)