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 "nimbro op2x adult sized open source 3d printed humanoid robot"):
  Abstract: Humanoid robotics research depends on capable robot platforms, but recently developed advanced platforms are often not available to other research groups, expensive, dangerous to operate, or closed-source. The lack of available platforms forces researchers to work with smaller robots, which have less strict dynamic constraints or with simulations, which lack many real-world effects. We developed NimbRo-OP2X to address this need. At a height of 135 cm our robot is large enough to interact in a human environment. Its low weight of only 19 kg makes the operation of the robot safe and easy, as no special operational equipment is necessary. Our robot is equipped with a fast onboard computer and a GPU to accelerate parallel computations. We extend our already open-source software by a deep-learning based vision system and gait parameter optimisation. The NimbRo-OP2X was evaluated during RoboCup 2018 in Montr\'eal, Canada, where it won all possible awards in the Humanoid AdultSize class.

Includes members:
  Member "on the convergence of adam and beyond":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "disentangling adaptive gradient methods from learning rates")
  Member "grown up nimbro robots winning robocup 2017 humanoid adultsize soccer competitions":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "nimbro robots winning robocup 2018 humanoid adultsize soccer competitions")
  Member "fused angles a representation of body orientation for balance":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "nimbro robots winning robocup 2018 humanoid adultsize soccer competitions")
  Member "omnidirectional bipedal walking with direct fused angle feedback mechanisms":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "nimbro robots winning robocup 2018 humanoid adultsize soccer competitions")
  Member "a ros based software framework for the nimbro op humanoid open platform":
    also connected through other hyperedges:
      - Hyperedge HE-5 (induced by source paper "motion generation interface of ros to podo software framework for wheeled huamanoid robot")
  Member "a monocular vision system for playing soccer in low color information environments":
    also connected through other hyperedges:
      - Hyperedge HE-6 (induced by source paper "utilizing temporal information in deep convolutional network for efficient soccer ball detection and tracking")
  Member "child sized 3d printed igus humanoid open platform":
    also connected through other hyperedges:
      - Hyperedge HE-7 (induced by source paper "online visual robot tracking and identification using deep lstm networks")
  Member "combining simulations and real robot experiments for bayesian optimization of bipedal gait stabilization":
    also connected through other hyperedges:
      - Hyperedge HE-8 (induced by source paper "nimbro robots winning robocup 2018 humanoid adultsize soccer competitions")

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)