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 "contact implicit trajectory optimization based on a variable smooth contact model and successive convexification"):
  Abstract: In this paper, we propose a contact-implicit trajectory optimization (CITO) method based on a variable smooth contact model (VSCM) and successive convexification (SCvx). The VSCM facilitates the convergence of gradient-based optimization without compromising physical fidelity. On the other hand, SCvx combines the advantages of direct and shooting methods for CITO. For evaluations, non-prehensile manipulation tasks are considered. We compare the proposed method to a version based on iterative linear quadratic regulator (iLQR) on a planar example. The proposed SCvx-based method is also tested on a standard robot platform. The results demonstrate that both methods can find physically-consistent motions that achieve the tasks without a meaningful initial guess owing to the VSCM. The proposed SCvx-based method outperforms the iLQR-based method in terms of convergence, computation time, and the quality of motions found. Finally, the proposed approach is shown to perform efficiently for real-world applications.

Includes members:
  Member "a comparative analysis of contact models in trajectory optimization for manipulation":
    also connected through other hyperedges:
      (none)
  Member "whole body nonlinear model predictive control through contacts for quadrupeds":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "guided constrained policy optimization for dynamic quadrupedal robot locomotion")
  Member "a family of iterative gauss newton shooting methods for nonlinear optimal control":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "optimizing dynamic trajectories for robustness to disturbances using polytopic projections")
  Member "automatic differentiation of rigid body dynamics for optimal control and estimation":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "automatic differentiation and continuous sensitivity analysis of rigid body dynamics")
  Member "trajectory optimization through contacts and automatic gait discovery for quadrupeds":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "learning how to walk warm starting optimal control solver with memory of motion")
  Member "hierarchical planning of dynamic movements without scheduled contact sequences":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "contact planning for the anymal quadruped robot using an acyclic reachability based planner")

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)