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: "learning discrete distributions from untrusted batches"
  Abstract: We consider the problem of learning a discrete distribution in the presence of an $\epsilon$ fraction of malicious data sources. Specifically, we consider the setting where there is some underlying distribution, $p$, and each data source provides a batch of $\ge k$ samples, with the guarantee that at least a $(1-\epsilon)$ fraction of the sources draw their samples from a distribution with total variation distance at most $\eta$ from $p$. We make no assumptions on the data provided by the remaining $\epsilon$ fraction of sources--this data can even be chosen as an adversarial function of the $(1-\epsilon)$ fraction of "good" batches. We provide two algorithms: one with runtime exponential in the support size, $n$, but polynomial in $k$, $1/\epsilon$ and $1/\eta$ that takes $O((n+k)/\epsilon^2)$ batches and recovers $p$ to error $O(\eta+\epsilon/\sqrt{k})$. This recovery accuracy is information theoretically optimal, to constant factors, even given an infinite number of data sources. Our second algorithm applies to the $\eta = 0$ setting and also achieves an $O(\epsilon/\sqrt{k})$ recover guarantee, though it runs in $\mathrm{poly}((nk)^k)$ time. This second algorithm, which approximates a certain tensor via a rank-1 tensor minimizing $\ell_1$ distance, is surprising in light of the hardness of many low-rank tensor approximation problems, and may be of independent interest.

Connected through hyperedge HE-1 (induced by source paper "learning structured distributions from untrusted batches faster and simpler"):
  with members:
    - "optimal robust learning of discrete distributions from batches"
    - "recent advances in algorithmic high dimensional robust statistics"
    - "efficiently learning structured distributions from untrusted batches"
    - "quantum entropy scoring for fast robust mean estimation and improved outlier detection"
    - "federated learning strategies for improving communication efficiency"
    - "sever a robust meta algorithm for stochastic optimization"
    - "being robust in high dimensions can be practical"
    - "learning populations of parameters"

Connected through hyperedge HE-2 (induced by source paper "on the sample complexity of adversarial multi source pac learning"):
  with members:
    - "optimal robust learning of discrete distributions from batches"
    - "byzantine stochastic gradient descent"
    - "do outliers ruin collaboration"
    - "byzantine robust distributed learning towards optimal statistical rates"
    - "mitigating sybils in federated learning poisoning"
    - "defending against saddle point attack in byzantine robust distributed learning"
    - "enhancing the reliability of out of distribution image detection in neural networks"
    - "distributed statistical machine learning in adversarial settings byzantine gradient descent"

Connected through hyperedge HE-3 (induced by source paper "efficiently learning structured distributions from untrusted batches"):
  with members:
    - "list decodable linear regression"
    - "list decodable learning via sum of squares"
    - "high dimensional estimation via sum of squares proofs"
    - "federated learning strategies for improving communication efficiency"
    - "being robust in high dimensions can be practical"
    - "list decodable robust mean estimation and learning mixtures of spherical gaussians"
    - "learning populations of parameters"
    - "mixture models robustness and sum of squares proofs"

Connected through hyperedge HE-4 (induced by source paper "robust learning from untrusted sources"):
  with members:
    - "byzantine stochastic gradient descent"
    - "algorithms and theory for multiple source adaptation"
    - "the convergence of stochastic gradient descent in asynchronous shared memory"
    - "byzantine robust distributed learning towards optimal statistical rates"
    - "improving the generalization of adversarial training with domain adaptation"
    - "mitigating sybils in federated learning poisoning"
    - "using trusted data to train deep networks on labels corrupted by severe noise"
    - "on fundamental limits of robust learning"

Connected through hyperedge HE-5 (induced by source paper "a little is enough circumventing defenses for distributed learning"):
  with members:
    - "detecting backdoor attacks on deep neural networks by activation clustering"
    - "federated learning strategies for improving communication efficiency"
    - "generalized byzantine tolerant sgd"
    - "byzantine robust distributed learning towards optimal statistical rates"
    - "spectral signatures in backdoor attacks"
    - "how to backdoor federated learning"
    - "an alternative view when does sgd escape local minima"
    - "mitigating sybils in federated learning poisoning"

Connected through hyperedge HE-6 (induced by source paper "optimal robust learning of discrete distributions from batches"):
  with members:
    - "efficiently learning structured distributions from untrusted batches"
    - "being robust in high dimensions can be practical"
    - "resilience a criterion for learning in the presence of arbitrary outliers"
    - "learning from untrusted data"
    - "agnostic estimation of mean and covariance"
    - "robust estimators in high dimensions without the computational intractability"
    - "communication efficient learning of deep networks from decentralized data"

Connected through hyperedge HE-7 (induced by source paper "how to backdoor federated learning"):
  with members:
    - "strip a defence against trojan attacks on deep neural networks"
    - "towards federated learning at scale system design"
    - "contamination attacks and mitigation in multi party machine learning"
    - "a little is enough circumventing defenses for distributed learning"
    - "distributed training with heterogeneous data bridging median and mean based algorithms"
    - "detecting backdoor attacks on deep neural networks by activation clustering"
    - "analyzing federated learning through an adversarial lens"
    - "fine pruning defending against backdooring attacks on deep neural networks"

Connected through hyperedge HE-8 (induced by source paper "sever a robust meta algorithm for stochastic optimization"):
  with members:
    - "efficient algorithms and lower bounds for robust linear regression"
    - "robust physical world attacks on deep learning models"
    - "certified defenses for data poisoning attacks"
    - "learning geometric concepts with nasty noise"
    - "outlier robust moment estimation via sum of squares"
    - "being robust in high dimensions can be practical"
    - "meta qsar a large scale application of meta learning to drug design and discovery"
    - "the consciousness prior"

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.LG(Machine Learning)