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: "multiplierless approximate 4 point dct vlsi architectures for transform block coding"
  Abstract: Two multiplierless algorithms are proposed for 4 × 4 approximate-discrete cosine transform (DCT) for transform coding in digital video. Computational architectures for one-dimensional (1D)/2D realisations are implemented using Xilinx field programmable gate array devices. CMOS synthesis at the 45 nm node indicates real-time operation at 1 GHz yielding 4 × 4 block rates of 125 MHz at < 120 mW of dynamic power consumption.

Connected through hyperedge HE-1 (induced by source paper "low complexity image and video coding based on an approximate discrete tchebichef transform"):
  with members:
    - "dct like transform for image compression requires 14 additions only"
    - "a dct approximation for image compression"

Connected through hyperedge HE-2 (induced by source paper "a multiplierless pruned dct like transformation for image and video compression that requires ten additions only"):
  with members:
    - "improved 8 point approximate dct for image and video compression requiring only 14 additions"
    - "dct like transform for image compression requires 14 additions only"
    - "a dct approximation for image compression"

Connected through hyperedge HE-3 (induced by source paper "dct like transform for image and video compression requires 10 additions only"):
  with members:
    - "improved 8 point approximate dct for image and video compression requiring only 14 additions"
    - "dct like transform for image compression requires 14 additions only"

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.AR(Hardware Architecture)