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: "complexity and compilation of gz aggregates in answer set programming"
  Abstract: Gelfond and Zhang recently proposed a new stable model semantics based on Vicious Circle Principle in order to improve the interpretation of logic programs with aggregates. The paper focuses on this proposal, and analyzes the complexity of both coherence testing and cautious reasoning under the new semantics. Some surprising results highlight similarities and differences versus mainstream stable model semantics for aggregates. Moreover, the paper reports on the design of compilation techniques for implementing the new semantics on top of existing ASP solvers, which eventually lead to realize a prototype system that allows for experimenting with Gelfond-Zhang's aggregates. #R##N#To appear in Theory and Practice of Logic Programming (TPLP), Proceedings of ICLP 2015.

Connected through hyperedge HE-1 (induced by source paper "shared aggregate sets in answer set programming"):
  with members:
    - "asp core 2 input language format"
    - "constraints lazy constraints or propagators in asp solving an empirical analysis"
    - "clingcon the next generation"
    - "combining answer set programming and domain heuristics for solving hard industrial problems application paper"
    - "anytime answer set optimization via unsatisfiable core shrinking"
    - "predicate logic as a modeling language modeling and solving some machine learning and data mining problems with idp3"
    - "rewriting recursive aggregates in answer set programming back to monotonicity"
    - "vicious circle principle and logic programs with aggregates"

Connected through hyperedge HE-2 (induced by source paper "multi shot asp solving with clingo"):
  with members:
    - "plasp 3 towards effective asp planning"
    - "clingcon the next generation"
    - "a framework for easing the development of applications embedding answer set programming"
    - "driving cdcl search"
    - "rewriting recursive aggregates in answer set programming back to monotonicity"
    - "predicate logic as a modelling language the idp system"
    - "clingo asp control preliminary report"
    - "a system for interactive query answering with answer set programming"

Connected through hyperedge HE-3 (induced by source paper "model enumeration in propositional circumscription via unsatisfiable core analysis"):
  with members:
    - "multi shot asp solving with clingo"
    - "anytime answer set optimization via unsatisfiable core shrinking"
    - "rewriting recursive aggregates in answer set programming back to monotonicity"
    - "the dlv system for knowledge representation and reasoning"

Connected through hyperedge HE-4 (induced by source paper "anytime answer set optimization via unsatisfiable core shrinking"):
  with members:
    - "rewriting recursive aggregates in answer set programming back to monotonicity"
    - "anytime computation of cautious consequences in answer set programming"
    - "vicious circle principle and logic programs with aggregates"
    - "complex optimization in answer set programming"
    - "on solving boolean multilevel optimization problems"
    - "algorithms for weighted boolean optimization"
    - "logic programs with propositional connectives and aggregates"

Connected through hyperedge HE-5 (induced by source paper "vicious circle principle and formation of sets in asp based languages"):
  with members:
    - "rewriting recursive aggregates in answer set programming back to monotonicity"
    - "vicious circle principle and logic programs with aggregates"
    - "characterizations of stable model semantics for logic programs with arbitrary constraint atoms"
    - "well founded and stable semantics of logic programs with aggregates"
    - "weight constraints as nested expressions"

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.AI(Artificial Intelligence)