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: "mutual information is copula entropy"
  Abstract: We prove that mutual information is actually negative copula entropy, based on which a method for mutual information estimation is proposed.

Connected through hyperedge HE-1 (induced by source paper "predicting tug score from gait characteristics based on video analysis and machine learning"):
  with members:
    - "mask r cnn"

Connected through hyperedge HE-2 (induced by source paper "estimating transfer entropy via copula entropy"):
  with members:
    - "discovering association with copula entropy"
    - "estimating the directed information and testing for causality"

Connected through hyperedge HE-3 (induced by source paper "variable selection with copula entropy"):
  with members:
    - "discovering association with copula entropy"

Connected through hyperedge HE-4 (induced by source paper "dependence structure estimation via copula"):
  with members:
    - "learning bayesian networks the combination of knowledge and statistical data"
    - "copula component analysis"

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)