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: "physarum machine implementation of a kolmogorov uspensky machine on a biological substrate"
  Abstract: We implement a Kolmogorov-Uspensky machine on the Plasmodium of the slime mold Physarum polycephalum. We provide experimental findings on realization of the machine instructions, illustrate basic operations, and elements of programming.

Connected through hyperedge HE-1 (induced by source paper "unconventional bio inspired model for design of logic gates"):
  with members:
    - "computation of the travelling salesman problem by a shrinking blob"

Connected through hyperedge HE-2 (induced by source paper "a survey on analog models of computation"):
  with members:
    - "real time computability of real numbers by chemical reaction networks"
    - "robustness of expressivity in chemical reaction networks"
    - "efficient analog circuits for boolean satisfiability"
    - "axiomatizing analog algorithms"
    - "homonym population protocols"
    - "physical computation p poly and p log"
    - "a uniform substitution calculus for differential dynamic logic"
    - "on recurrent reachability for continuous linear dynamical systems"

Connected through hyperedge HE-3 (induced by source paper "slime mould the fundamental mechanisms of cognition"):
  with members:
    - "low algorithmic complexity entropy deceiving graphs"
    - "algorithmically probable mutations reproduce aspects of evolution such as convergence rate genetic memory and modularity"
    - "algorithmic complexity for short binary strings applied to psychology a primer"
    - "algorithmic complexity for psychology a user friendly implementation of the coding theorem method"
    - "natural scene statistics mediate the perception of image complexity"
    - "on creativity of slime mould"

Connected through hyperedge HE-4 (induced by source paper "thirty eight things to do with live slime mould"):
  with members:
    - "material approximation of data smoothing and spline curves inspired by slime mould"
    - "on hybrid circuits exploiting thermistive properties of slime mould"
    - "slime mould electronic oscillators"
    - "towards slime mould chemical sensor mapping chemical inputs onto electrical potential dynamics of physarum polycephalum"
    - "bio imitation of mexican migration routes to the usa with slime mould on 3d terrains"
    - "towards slime mould colour sensor recognition of colours by physarum polycephalum"
    - "slime mould tactile sensor"
    - "computation of the travelling salesman problem by a shrinking blob"

Connected through hyperedge HE-5 (induced by source paper "towards lateral inhibition and collective perception in unorganised non neural systems"):
  with members:
    - "slime mould memristors"
    - "the emergence and dynamical evolution of complex transport networks from simple low level behaviours"
    - "emergence of self organized amoeboid movement in a multi agent approximation of physarum polycephalum"
    - "towards physarum robots computing and manipulating on water surface"

Connected through hyperedge HE-6 (induced by source paper "slime mould inspired generalised voronoi diagrams with repulsive fields"):
  with members:
    - "the emergence and dynamical evolution of complex transport networks from simple low level behaviours"
    - "emergence of self organized amoeboid movement in a multi agent approximation of physarum polycephalum"
    - "physarum boats if plasmodium sailed it would never leave a port"
    - "towards physarum robots computing and manipulating on water surface"

Connected through hyperedge HE-7 (induced by source paper "mechanisms inducing parallel computation in a model of physarum polycephalum transport networks"):
  with members:
    - "the emergence and dynamical evolution of complex transport networks from simple low level behaviours"
    - "emergence of self organized amoeboid movement in a multi agent approximation of physarum polycephalum"
    - "towards physarum robots computing and manipulating on water surface"

Connected through hyperedge HE-8 (induced by source paper "a morphological adaptation approach to path planning inspired by slime mould"):
  with members:
    - "material approximation of data smoothing and spline curves inspired by slime mould"
    - "computation of the travelling salesman problem by a shrinking blob"

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)