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: "cola decentralized linear learning"
  Abstract: Decentralized machine learning is a promising emerging paradigm in view of global challenges of data ownership and privacy. We consider learning of linear classification and regression models, in the setting where the training data is decentralized over many user devices, and the learning algorithm must run on-device, on an arbitrary communication network, without a central coordinator. We propose COLA, a new decentralized training algorithm with strong theoretical guarantees and superior practical performance. Our framework overcomes many limitations of existing methods, and achieves communication efficiency, scalability, elasticity as well as resilience to changes in data and participating devices.

Connected through hyperedge HE-1 (induced by source paper "turbo aggregate breaking the quadratic aggregation barrier in secure federated learning"):
  with members:
    - "advances and open problems in federated learning"
    - "central server free federated learning over single sided trust social networks"
    - "towards federated learning at scale system design"
    - "can you really backdoor federated learning"
    - "semi cyclic stochastic gradient descent"
    - "local model poisoning attacks to byzantine robust federated learning"
    - "peer to peer federated learning on graphs"
    - "federated learning challenges methods and future directions"

Connected through hyperedge HE-2 (induced by source paper "central server free federated learning over single sided trust social networks"):
  with members:
    - "decentralized online learning take benefits from others data without sharing your own to track global trend"
    - "introduction to online convex optimization"
    - "federated machine learning concept and applications"
    - "asynchronous subgradient push"
    - "pipe sgd a decentralized pipelined sgd framework for distributed deep net training"
    - "federated learning strategies for improving communication efficiency"
    - "don t use large mini batches use local sgd"
    - "stochastic gradient push for distributed deep learning"

Connected through hyperedge HE-3 (induced by source paper "federated pca with adaptive rank estimation"):
  with members:
    - "federated learning strategies for improving communication efficiency"
    - "moses a streaming algorithm for linear dimensionality reduction"
    - "differentially private federated learning a client level perspective"
    - "robust frequent directions with application in online learning"
    - "federated multi task learning"
    - "communication efficient learning of deep networks from decentralized data"
    - "improved practical matrix sketching with guarantees"
    - "frequent directions simple and deterministic matrix sketching"

Connected through hyperedge HE-4 (induced by source paper "texttt deepsqueeze decentralization meets error compensated compression"):
  with members:
    - "decentralized stochastic optimization and gossip algorithms with compressed communication"
    - "pipe sgd a decentralized pipelined sgd framework for distributed deep net training"
    - "communication compression for decentralized training"
    - "sparsified sgd with memory"
    - "error compensated quantized sgd and its applications to large scale distributed optimization"
    - "gradient sparsification for communication efficient distributed optimization"
    - "terngrad ternary gradients to reduce communication in distributed deep learning"
    - "qsgd communication efficient sgd via gradient quantization and encoding"

Connected through hyperedge HE-5 (induced by source paper "asynchronous decentralized optimization in directed networks"):
  with members:
    - "asynchronous subgradient push"
    - "pipe sgd a decentralized pipelined sgd framework for distributed deep net training"
    - "asyspa an exact asynchronous algorithm for convex optimization over digraphs"
    - "accurate large minibatch sgd training imagenet in 1 hour"
    - "asynchronous stochastic gradient descent with delay compensation"
    - "optimal distributed online prediction using mini batches"

Connected through hyperedge HE-6 (induced by source paper "distributed estimation via network regularization"):
  with members:
    - "federated learning strategies for improving communication efficiency"
    - "federated multi task learning"
    - "communication efficient learning of deep networks from decentralized data"
    - "network lasso clustering and optimization in large graphs"

Connected through hyperedge HE-7 (induced by source paper "distributed learning over unreliable networks"):
  with members:
    - "byzantine stochastic gradient descent"
    - "communication compression for decentralized training"
    - "sparcml high performance sparse communication for machine learning"
    - "byzantine robust distributed learning towards optimal statistical rates"
    - "gossipgrad scalable deep learning using gossip communication based asynchronous gradient descent"
    - "don t use large mini batches use local sgd"
    - "sparsified sgd with memory"
    - "d 2 decentralized training over decentralized data"

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.DC(Distributed, Parallel, and Cluster Computing)