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: "the daala directional deringing filter"
  Abstract: This paper presents the deringing filter used in the Daala royalty-free video codec. The filter is based on a non-linear conditional replacement filter and is designed for vectorization efficiency. It takes into account the direction of edges and patterns by operating, on a block-by-block basis, along the direction detected in each block. Objective results show a bit-rate reduction between 4% and 8% on video sequences.

Connected through hyperedge HE-1 (induced by source paper "perceptually driven video coding with the daala video codec"):
  with members:
    - "daala building a next generation video codec from unconventional technology"
    - "high quality low delay music coding in the opus codec"
    - "predicting chroma from luma with frequency domain intra prediction"
    - "perceptual vector quantization for video coding"

Connected through hyperedge HE-2 (induced by source paper "daala building a next generation video codec from unconventional technology"):
  with members:
    - "high quality low delay music coding in the opus codec"
    - "predicting chroma from luma with frequency domain intra prediction"
    - "perceptual vector quantization for video coding"

Connected through hyperedge HE-3 (induced by source paper "daala a perceptually driven still picture codec"):
  with members:
    - "daala a perceptually driven next generation video codec"
    - "predicting chroma from luma with frequency domain intra prediction"
    - "perceptual vector quantization for video coding"

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.MM(Multimedia)