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 primal dual approximation algorithm for min sum single machine scheduling problems"
  Abstract: We consider the following single-machine scheduling problem, which is often denoted $1||\sum f_{j}$: we are given $n$ jobs to be scheduled on a single machine, where each job $j$ has an integral processing time $p_j$, and there is a nondecreasing, nonnegative cost function $f_j(C_{j})$ that specifies the cost of finishing $j$ at time $C_{j}$; the objective is to minimize $\sum_{j=1}^n f_j(C_j)$. Bansal \& Pruhs recently gave the first constant approximation algorithm with a performance guarantee of 16. We improve on this result by giving a primal-dual pseudo-polynomial-time algorithm based on the recently introduced knapsack-cover inequalities. The algorithm finds a schedule of cost at most four times the constructed dual solution. Although we show that this bound is tight for our algorithm, we leave open the question of whether the integrality gap of the LP is less than 4. Finally, we show how the technique can be adapted to yield, for any $\epsilon >0$, a $(4+\epsilon )$-approximation algorithm for this problem.

Connected through hyperedge HE-1 (induced by source paper "a water filling primal dual algorithm for approximating non linear covering problems"):
  with members:
    - "geometry of scheduling on multiple machines"
    - "scheduling to approximate minimization objectives on identical machines"
    - "constant approximation algorithm for non uniform capacitated multi item lot sizing via strong covering inequalities"
    - "small extended formulation for knapsack cover inequalities from monotone circuits"
    - "lp based algorithms for capacitated facility location"
    - "how unsplittable flow covering helps scheduling with job dependent cost functions"
    - "the geometry of scheduling"

Connected through hyperedge HE-2 (induced by source paper "a fast exact algorithm for airplane refueling problem"):
  with members:
    - "a polynomial time approximation scheme for the airplane refueling problem"
    - "how unsplittable flow covering helps scheduling with job dependent cost functions"
    - "the local global conjecture for scheduling with non linear cost"
    - "dual techniques for scheduling on a machine with varying speed"
    - "the geometry of scheduling"

Connected through hyperedge HE-3 (induced by source paper "geometry of scheduling on multiple machines"):
  with members:
    - "scheduling to approximate minimization objectives on identical machines"
    - "a polynomial time constant approximation for minimizing total weighted flow time"
    - "how unsplittable flow covering helps scheduling with job dependent cost functions"
    - "on column restricted and priority covering integer programs"
    - "the geometry of scheduling"

Connected through hyperedge HE-4 (induced by source paper "scheduling to approximate minimization objectives on identical machines"):
  with members:
    - "a 4 approximation for scheduling on a single machine with general cost function"
    - "the geometry of scheduling"

Connected through hyperedge HE-5 (induced by source paper "risk averse single machine scheduling complexity and approximation"):
  with members:
    - "single machine scheduling problems with uncertain parameters and the owa criterion"
    - "complexity of interval minmax regret scheduling on parallel identical machines with total completion time criterion"

Connected through hyperedge HE-6 (induced by source paper "small extended formulation for knapsack cover inequalities from monotone circuits"):
  with members:
    - "extension complexity of independent set polytopes"
    - "addition is exponentially harder than counting for shallow monotone circuits"
    - "a 4 approximation for scheduling on a single machine with general cost function"
    - "lower bounds on the size of semidefinite programming relaxations"
    - "approximate constraint satisfaction requires large lp relaxations"
    - "the matching polytope has exponential extension complexity"
    - "approximation limits of linear programs beyond hierarchies"
    - "the geometry of scheduling"

Connected through hyperedge HE-7 (induced by source paper "a polynomial time approximation scheme for the airplane refueling problem"):
  with members:
    - "how unsplittable flow covering helps scheduling with job dependent cost functions"
    - "polynomial time approximation schemes for the traveling repairman and other minimum latency problems"
    - "dual techniques for scheduling on a machine with varying speed"
    - "the geometry of scheduling"

Connected through hyperedge HE-8 (induced by source paper "how unsplittable flow covering helps scheduling with job dependent cost functions"):
  with members:
    - "a 4 approximation for scheduling on a single machine with general cost function"
    - "dual techniques for scheduling on a machine with varying speed"
    - "a constant factor approximation algorithm for unsplittable flow on paths"
    - "the geometry of scheduling"

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)