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: "low memory implementation of orthogonal matching pursuit like greedy algorithms analysis and applications"
  Abstract: The convergence analysis of a low memory implementation of the Orthogonal Matching Pursuit method, which is termed Self Projected Matching Pursuit, is presented. The approach is extended to improve the sparsity ratio of a signal representation when approximating the signal by partitioning. A backward strategy, for reducing terms in a signal decomposition, is discussed. The suitability of the methods, to be applied on cases where standard implementations of Orthogonal Matching Pursuit are not feasible due to memory requirements, is illustrated by producing high quality approximation of melodic music and X-Ray medical images.

Connected through hyperedge HE-1 (induced by source paper "effective sparse representation of x ray medical images"):
  with members:
    - "cooperative greedy pursuit strategies for sparse signal representation by partitioning"
    - "hierarchized block wise image approximation by greedy pursuit strategies"
    - "block sparse signals uncertainty relations and efficient recovery"

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.CV(Computer Vision and Pattern Recognition)