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 "a robust model based biped locomotion framework based on three mass model from planning to control"):
  Abstract: Biped robots are inherently unstable because of their complex kinematics as well as dynamics. Despite types of research in developing biped locomotion, the performance of biped locomotion is still far from the expectations. #R##N#This paper proposes a model-based framework to generate stable biped locomotion. The core of this framework is an abstract dynamics model which is composed of three masses to consider the dynamics of stance leg, torso and swing leg for minimizing the tracking problems. According to this dynamics model, we propose a modular walking reference trajectories planner which takes into account obstacles to plan all the references. Moreover, this dynamics model is used to formulate the low-level controller as a Model Predictive Control~(MPC) scheme which can consider some constraints in the states of the system, inputs, outputs and also mixed input-output. #R##N#The performance and the robustness of the proposed framework are validated by performing several simulations using~\mbox{MATLAB}. The simulation results show that the proposed framework is capable of generating the biped locomotion robustly.

Includes members:
  Member "footstep planning for autonomous walking over rough terrain":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "deepgait planning and control of quadrupedal gaits using deep reinforcement learning")
  Member "a fast and stable omnidirectional walking engine for the nao humanoid robot":
    also connected through other hyperedges:
      (none)
  Member "a whole body model predictive control scheme including external contact forces and com height variations":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "whole body mpc for a dynamically stable mobile manipulator")
  Member "3lp a linear 3d walking model including torso and swing dynamics":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "optimal reduced order modeling of bipedal locomotion")

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)