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: "instanton based techniques for analysis and reduction of error floors of ldpc codes"
  Abstract: We describe a family of instanton-based optimization methods developed recently for the analysis of the error floors of low-density parity-check (LDPC) codes. Instantons are the most probable configurations of the channel noise which result in decoding failures. We show that the general idea and the respective optimization technique are applicable broadly to a variety of channels, discrete or continuous, and variety of sub-optimal decoders. Specifically, we consider: iterative belief propagation (BP) decoders, Gallager type decoders, and linear programming (LP) decoders performing over the additive white Gaussian noise channel (AWGNC) and the binary symmetric channel (BSC). The instanton analysis suggests that the underlying topological structures of the most probable instanton of the same code but different channels and decoders are related to each other. Armed with this understanding of the graphical structure of the instanton and its relation to the decoding failures, we suggest a method to construct codes whose Tanner graphs are free of these structures, and thus have less significant error floors.

Connected through hyperedge HE-1 (induced by source paper "the admm penalized decoder for ldpc codes"):
  with members:
    - "hierarchical and high girth qc ldpc codes"
    - "linear programming decoding of spatially coupled codes"
    - "an improved three weight message passing algorithm"
    - "counting in graph covers a combinatorial characterization of the bethe entropy function"
    - "mathematical programming decoding of binary linear codes theory and algorithms"
    - "error floor approximation for ldpc codes in the awgn channel"
    - "adaptive cut generation algorithm for improved linear programming decoding of binary linear codes"
    - "decomposition methods for large scale lp decoding"

Connected through hyperedge HE-2 (induced by source paper "new decoding scheme for ldpc codes based on simple product code structure"):
  with members:
    - "multilevel decoders surpassing belief propagation on the binary symmetric channel"
    - "lowering the error floor of ldpc codes using cyclic liftings"

Connected through hyperedge HE-3 (induced by source paper "thresholds of absorbing sets in low density parity check codes"):
  with members:
    - "the cycle consistency matrix approach to absorbing sets in separable circulant based ldpc codes"
    - "error floor approximation for ldpc codes in the awgn channel"
    - "two bit bit flipping decoding of ldpc codes"
    - "on trapping sets and guaranteed error correction capability of ldpc codes and gldpc codes"
    - "on the dynamics of the error floor behavior in regular ldpc codes"
    - "error correction capability of column weight three ldpc codes"
    - "error correction capability of column weight three ldpc codes"

Connected through hyperedge HE-4 (induced by source paper "polytope of correct linear programming decoding and low weight pseudo codewords"):
  with members:
    - "worst configurations instantons for compressed sensing over reals a channel coding approach"
    - "guessing facets polytope structure and improved lp decoder"
    - "adaptive methods for linear programming decoding"
    - "reducing the error floor"
    - "loop calculus helps to improve belief propagation and linear programming decodings of low density parity check codes"
    - "towards low complexity linear programming decoding"
    - "graph cover decoding and finite length analysis of message passing iterative decoding of ldpc codes"

Connected through hyperedge HE-5 (induced by source paper "ldpc codes from latin squares free of small trapping sets"):
  with members:
    - "on trapping sets and guaranteed error correction capability of ldpc codes and gldpc codes"
    - "a message passing algorithm for counting short cycles in a graph"
    - "ldpc codes which can correct three errors under iterative decoding"
    - "shortened array codes of large girth"
    - "pseudocodewords of tanner graphs"

Connected through hyperedge HE-6 (induced by source paper "lowering the error floor of ldpc codes using cyclic liftings"):
  with members:
    - "quasi cyclic ldpc codes influence of proto and tanner graph structure on minimum hamming distance upper bounds"
    - "code annealing and the suppressing effect of the cyclically lifted ldpc code ensemble"
    - "instanton analysis of low density parity check codes in the error floor regime"
    - "a general method for finding low error rates of ldpc codes"

Connected through hyperedge HE-7 (induced by source paper "structured ldpc codes from permutation matrices free of small trapping sets"):
  with members:
    - "shortened array codes of large girth"

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.IT(Information Theory)