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: "predicate generation for learning based quantifier free loop invariant inference"
  Abstract: We address the predicate generation problem in the context of loop invariant#N#inference. Motivated by the interpolation-based abstraction refinement#N#technique, we apply the interpolation theorem to synthesize predicates#N#implicitly implied by program texts. Our technique is able to improve the#N#effectiveness and efficiency of the learning-based loop invariant inference#N#algorithm in [14]. We report experiment results of examples from Linux,#N#SPEC2000, and Tar utility.

Connected through hyperedge HE-1 (induced by source paper "synthesizing basic semialgebraic invariants by semidefinite programming"):
  with members:
    - "horn ice learning for synthesizing invariantsand contracts"
    - "polynomial invariants for affine programs"
    - "abstraction of elementary hybrid systems by variable transformation"
    - "julia a fresh approach to numerical computing"
    - "generating non linear interpolants by semidefinite programming"

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.LO(Logic in Computer Science)