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: "optimal task scheduling benefits from a duplicate free state space"
  Abstract: The NP-hard problem of task scheduling with communication delays (P|prec,c_{ij}|C_{\mathrm{max}}) is often tackled using approximate methods, but guarantees on the quality of these heuristic solutions are hard to come by. Optimal schedules are therefore invaluable for properly evaluating these heuristics, as well as being very useful for applications in time critical systems. Optimal solving using branch-and-bound algorithms like A* has been shown to be promising in the past, with a state-space model we refer to as exhaustive list scheduling (ELS). The obvious weakness of this model is that it leads to the production of large numbers of duplicate states during a search, requiring special techniques to mitigate this which cost additional time and memory. In this paper we define a new state-space model (AO) in which we divide the problem into two distinct sub-problems: first we decide the allocations of all tasks to processors, and then we order the tasks on their allocated processors in order to produce a complete schedule. This two-phase state-space model offers no potential for the production of duplicates. We also describe how the pruning techniques and optimisations developed for the ELS model were adapted or made obsolete by the AO model. An experimental evaluation shows that the use of this new state-space model leads to a significant increase in the number of task graphs able to be scheduled within a feasible time-frame, particularly for task graphs with a high communication-to-computation ratio. Finally, some advanced lower bound heuristics are proposed for the AO model, and evaluation demonstrates that significant gains can be achieved from the consideration of necessary idle time.

Connected through hyperedge HE-1 (induced by source paper "parallel and memory limited algorithms for optimal task scheduling using a duplicate free state space"):
  with members:
    - "best first heuristic search for multicore machines"

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.DC(Distributed, Parallel, and Cluster Computing)