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: "enabling user driven checkpointing strategies in reverse mode automatic differentiation"
  Abstract: This paper presents a new functionality of the Automatic Differentiation (AD) tool Tapenade. Tapenade generates adjoint codes which are widely used for optimization or inverse problems. Unfortunately, for large applications the adjoint code demands a great deal of memory, because it needs to store a large set of intermediates values. To cope with that problem, Tapenade implements a sub-optimal version of a technique called checkpointing, which is a trade-off between storage and recomputation. Our long-term goal is to provide an optimal checkpointing strategy for every code, not yet achieved by any AD tool. Towards that goal, we first introduce modifications in Tapenade in order to give the user the choice to select the checkpointing strategy most suitable for their code. Second, we conduct experiments in real-size scientific codes in order to gather hints that help us to deduce an optimal checkpointing strategy. Some of the experimental results show memory savings up to 35% and execution time up to 90%.

Connected through hyperedge HE-1 (induced by source paper "meta learning with implicit gradients"):
  with members:
    - "meta learning with differentiable convex optimization"
    - "meta learning for low resource natural language generation in task oriented dialogue systems"
    - "a differentiable augmented lagrangian method for bilevel nonlinear optimization"
    - "infinite mixture prototypes for few shot learning"
    - "meta dataset a dataset of datasets for learning to learn from few examples"
    - "on first order meta learning algorithms"
    - "recasting gradient based meta learning as hierarchical bayes"
    - "meta learning with latent embedding optimization"

Connected through hyperedge HE-2 (induced by source paper "truncated back propagation for bilevel optimization"):
  with members:
    - "introduction to online convex optimization"
    - "learning to optimize neural nets"
    - "online learning rate adaptation with hypergradient descent"
    - "prototypical networks for few shot learning"
    - "model agnostic meta learning for fast adaptation of deep networks"
    - "learning to learn by gradient descent by gradient descent"
    - "hyperface a deep multi task learning framework for face detection landmark localization pose estimation and gender recognition"
    - "on differentiating parameterized argmin and argmax problems with application to bi level optimization"

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.DS(Data Structures and Algorithms)