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: "non linear estimation is easy"
  Abstract: Non-linear state estimation and some related topics like parametric estimation, fault diagnosis and perturbation attenuation are tackled here via a new methodology in numerical differentiation. The corresponding basic system theoretic definitions and properties are presented within the framework of differential algebra, which permits to handle system variables and their derivatives of any order. Several academic examples and their computer simulations, with online estimations, illustrate our viewpoint.

Connected through hyperedge HE-1 (induced by source paper "bullwhip effect attenuation in supply chain management via control theoretic tools and short term forecasts a preliminary study with an application to perishable inventories"):
  with members:
    - "la production de nitrites lors de la denitrification des eaux usees par biofiltration strategie de controle et de reduction des concentrations residuelles"
    - "energy saving for building heating via a simple and efficient model free control design first steps with computer simulations"
    - "an efficient model free setting for longitudinal and lateral vehicle control validation through the interconnected pro sivic rtmaps prototyping platform"
    - "an overview and comparative analysis of recurrent neural networks for short term load forecasting"

Connected through hyperedge HE-2 (induced by source paper "easily implementable time series forecasting techniques for resource provisioning in cloud computing"):
  with members:
    - "time series modeling and large scale global solar radiation forecasting from geostationary satellites data"
    - "algebraic change point detection"
    - "analyse non standard du bruit"

Connected through hyperedge HE-3 (induced by source paper "energy saving for building heating via a simple and efficient model free control design first steps with computer simulations"):
  with members:
    - "an efficient model free setting for longitudinal and lateral vehicle control validation through the interconnected pro sivic rtmaps prototyping platform"
    - "a simple and efficient feedback control strategy for wastewater denitrification"

Connected through hyperedge HE-4 (induced by source paper "short term solar irradiance and irradiation forecasts via different time series techniques a preliminary study"):
  with members:
    - "analyse non standard du bruit"

Connected through hyperedge HE-5 (induced by source paper "model free control of nonlinear power converters"):
  with members:
    - "variational and symplectic approach of the model free control"

Connected through hyperedge HE-6 (induced by source paper "algebraic change point detection"):
  with members:
    - "analyse non standard du bruit"

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.CE(Computational Engineering, Finance, and Science)