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: "an o log opt approximation for covering and packing minor models of theta _r"
  Abstract: Given two graphs $G$ and $H$, we define $\textsf{v-cover}_{H}(G)$ (resp. $\textsf{e-cover}_{H}(G)$) as the minimum number of vertices (resp. edges) whose removal from $G$ produces a graph without any minor isomorphic to ${H}$. Also $\textsf{v-pack}_{H}(G)$ (resp. $\textsf{v-pack}_{H}(G)$) is the maximum number of vertex- (resp. edge-) disjoint subgraphs of $G$ that contain a minor isomaorphic to $H$. We denote by $\theta_r$ the graph with two vertices and $r$ parallel edges between them. When $H=\theta_r$, the parameters $\textsf{v-cover}_{H}$, $\textsf{e-cover}_{H}$, $\textsf{v-pack}_{H}$, and $\textsf{v-pack}_{H}$ are NP-hard to compute (for sufficiently big values of $r$). Drawing upon combinatorial results in [Minors in graphs of large $\theta_r$-girth, Chatzidimitriou et al., arXiv:1510.03041], we give an algorithmic proof that if $\textsf{v-pack}_{\theta_r}(G)\leq k$, then $\textsf{v-cover}_{\theta_r}(G) = O(k\log k)$, and similarly for $\textsf{v-pack}_{\theta_r}$ and $\textsf{e-cover}_{\theta_r}$. In other words, the class of graphs containing ${\theta_r}$ as a minor has the vertex/edge Erd\H{o}s-P\'osa property, for every positive integer $r$. Using the algorithmic machinery of our proofs, we introduce a unified approach for the design of an $O(\log {\rm OPT})$-approximation algorithm for $\textsf{v-pack}_{\theta_r}$, $\textsf{v-cover}_{\theta_r}$, $\textsf{v-pack}_{\theta_r}$, and $\textsf{e-cover}_{\theta_r}$ that runs in $O(n\cdot \log(n)\cdot m)$ steps. Also, we derive several new Erd\H{o}s-P\'osa-type results from the techniques that we introduce.

Connected through hyperedge HE-1 (induced by source paper "a tight erdos posa function for wheel minors"):
  with members:
    - "recent techniques and results on the erd h o s p osa property"
    - "large treewidth graph decompositions and applications"
    - "polynomial bounds for the grid minor theorem"
    - "planar f deletion approximation and optimal fpt algorithms"

Connected through hyperedge HE-2 (induced by source paper "packing and covering induced subdivisions"):
  with members:
    - "recent techniques and results on the erd h o s p osa property"
    - "approximation and kernelization for chordal vertex deletion"
    - "hitting forbidden minors approximation and kernelization"

Connected through hyperedge HE-3 (induced by source paper "recent techniques and results on the erd h o s p osa property"):
  with members:
    - "hitting minors subdivisions and immersions in tournaments"
    - "linear kernels for edge deletion problems to immersion closed graph classes"
    - "approximation and kernelization for chordal vertex deletion"
    - "an exact characterization of tractable demand patterns for maximum disjoint path problems"
    - "large treewidth graph decompositions and applications"
    - "polynomial bounds for the grid minor theorem"
    - "polynomial gap extensions of the erd h o s p osa theorem"

Connected through hyperedge HE-4 (induced by source paper "cutwidth obstructions and algorithmic aspects"):
  with members:
    - "linear kernels for edge deletion problems to immersion closed graph classes"
    - "faster computation of path width"

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)