human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge is induced by one source paper and its member nodes are the cited papers.

Details of the hypergraph:
Center hyperedge (induced by source paper "feedback control of an exoskeleton for paraplegics toward robustly stable hands free dynamic walking"):
  Abstract: This paper presents a design methodology for feedback control policy that enables lower-limb exoskeletons with paraplegic patients to walk without the use of crutches. The objective is to translate formal control design methodologies from bipedal robots to exoskeleton systems to achieve dynamic hands-free walking. Built upon the unique combination of fast offline trajectory optimization and machine learning algorithms, we develop a smooth policy that provides a systematic means for coordinating limb motion and providing corrective actions to follow commands and attenuate disturbances. This approach is validated both numerically and in pre-clinical experimental testing, the latter enabling people with paraplegia to walk hands-free, with all control actions required for stable dynamic walking provided by an onboard controller.

Includes members:
  Member "an efficiently solvable quadratic program for stabilizing dynamic locomotion":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "an inverse dynamics approach to control lyapunov functions")
  Member "torque saturation in bipedal robotic walking through control lyapunov function based quadratic programs":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "episodic learning with control lyapunov functions for uncertain robotic systems")

Question: Please tell me which class the source paper 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.RO(Robotics)