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: "modeling variations of first order horn abduction in answer set programming"
  Abstract: We study abduction in First Order Horn logic theories where all atoms can be abduced and we are looking for preferred solutions with respect to three objective functions: cardinality minimality, coherence, and weighted abduction. We represent this reasoning problem in Answer Set Programming (ASP), in order to obtain a flexible framework for experimenting with global constraints and objective functions, and to test the boundaries of what is possible with ASP. Realizing this problem in ASP is challenging as it requires value invention and equivalence between certain constants, because the Unique Names Assumption does not hold in general. To permit reasoning in cyclic theories, we formally describe fine-grained variations of limiting Skolemization. We identify term equivalence as a main instantiation bottleneck, and improve the efficiency of our approach with on-demand constraints that were used to eliminate the same bottleneck in state-of-the-art solvers. We evaluate our approach experimentally on the ACCEL benchmark for plan recognition in Natural Language Understanding. Our encodings are publicly available, modular, and our approach is more efficient than state-of-the-art solvers on the ACCEL benchmark.

Connected through hyperedge HE-1 (induced by source paper "the external interface for extending wasp"):
  with members:
    - "shared aggregate sets in answer set programming"
    - "constraint answer set solver ezcsp and why integration schemas matter"
    - "constraints lazy constraints or propagators in asp solving an empirical analysis"
    - "combining answer set programming and domain heuristics for solving hard industrial problems application paper"
    - "optimizing phylogenetic supertrees using answer set programming"
    - "generating explanations for biomedical queries"
    - "clingo asp control preliminary report"
    - "asp modulo csp the clingcon system"

Connected through hyperedge HE-2 (induced by source paper "technical report adjudication of coreference annotations via answer set optimization"):
  with members:
    - "asp core 2 input language format"
    - "marmara turkish coreference corpus and coreference resolution baseline"
    - "tight logic programs"
    - "minimal change integrity maintenance using tuple deletions"

Connected through hyperedge HE-3 (induced by source paper "constraints lazy constraints or propagators in asp solving an empirical analysis"):
  with members:
    - "constraint answer set solver ezcsp and why integration schemas matter"
    - "the power of non ground rules in answer set programming"
    - "combining answer set programming and domain heuristics for solving hard industrial problems application paper"
    - "a model building framework for answer set programming with external computations"
    - "the dlvhex system for knowledge representation recent advances system description"
    - "optimizing phylogenetic supertrees using answer set programming"
    - "generating explanations for biomedical queries"
    - "lazy model expansion interleaving grounding with search"

Connected through hyperedge HE-4 (induced by source paper "improving scalability of inductive logic programming via pruning and best effort optimisation"):
  with members:
    - "iiscnlp at semeval 2016 task 2 interpretable sts with ilp based multiple chunk aligner"
    - "anytime answer set optimization via unsatisfiable core shrinking"
    - "learning weak constraints in answer set programming"
    - "incremental learning of event definitions with inductive logic programming"
    - "introduction to the conll 2000 shared task chunking"

Connected through hyperedge HE-5 (induced by source paper "modeling variations of first order horn abduction in answer set programming using on demand constraints and flexible value invention"):
  with members:
    - "a model building framework for answer set programming with external computations"
    - "asperix a first order forward chaining approach for answer set computing"
    - "lazy model expansion interleaving grounding with search"
    - "clingo asp control preliminary report"
    - "the ciff proof procedure for abductive logic programming with constraints theory implementation and experiments"

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)