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: "flat combining and the synchronization parallelism tradeoff"
  Abstract: Traditional data structure designs, whether lock-based or lock-free, provide parallelism via fine grained synchronization among threads.   We introduce a new synchronization paradigm based on coarse locking, which we call flat combining. The cost of synchronization in flat combining is so low, that having a single thread holding a lock perform the combined access requests of all others, delivers, up to a certain non-negligible concurrency level, better performance than the most effective parallel finely synchronized implementations. We use flat-combining to devise, among other structures, new linearizable stack, queue, and priority queue algorithms that greatly outperform all prior algorithms.

Connected through hyperedge HE-1 (induced by source paper "using skip graphs for increased numa locality"):
  with members:
    - "global local view scalable consistency for concurrent data types"
    - "the lock free k lsm relaxed priority queue"
    - "the adaptive priority queue with elimination and combining"

Connected through hyperedge HE-2 (induced by source paper "adapting persistent data structures for concurrency and speculation"):
  with members:
    - "distributionally linearizable data structures"
    - "pam parallel augmented maps"
    - "pragmatic primitives for non blocking data structures"
    - "techniques for constructing efficient lock free data structures"
    - "a general technique for non blocking trees"
    - "non determinism in byzantine fault tolerant replication"
    - "well structured futures and cache locality"
    - "a critique of ansi sql isolation levels"

Connected through hyperedge HE-3 (induced by source paper "parallel finger search structures"):
  with members:
    - "optimal parallel algorithms in the binary forking model"
    - "optimal multithreaded batch parallel 2 3 trees"
    - "parallel working set search structures"
    - "batch parallel euler tour trees"
    - "parallel combining benefits of explicit synchronization"
    - "a general technique for non blocking trees"
    - "fast parallel operations on search trees"

Connected through hyperedge HE-4 (induced by source paper "specifying concurrent programs in separation logic morphisms and simulations"):
  with members:
    - "proving linearizability using forward simulations"
    - "concurrent data structures linked in time"
    - "hoare style specifications as correctness conditions for non linearizable concurrent objects"
    - "between linearizability and quiescent consistency quantitative quiescent consistency"
    - "specifying and verifying concurrent algorithms with histories and subjectivity"
    - "linearizability with ownership transfer"

Connected through hyperedge HE-5 (induced by source paper "multiversion concurrency with bounded delay and precise garbage collection"):
  with members:
    - "delay free concurrency on faulty persistent memory"
    - "pam parallel augmented maps"
    - "reclaiming memory for lock free data structures there has to be a better way"
    - "a general technique for non blocking trees"
    - "minuet a scalable distributed multiversion b tree"

Connected through hyperedge HE-6 (induced by source paper "a scalable learned index scheme in storage systems"):
  with members:
    - "a tree a bounded approximate index structure"
    - "outrageously large neural networks the sparsely gated mixture of experts layer"
    - "the case for learned index structures"
    - "very deep convolutional networks for large scale image recognition"

Connected through hyperedge HE-7 (induced by source paper "monotonically relaxing concurrent data structure semantics for performance an efficient 2d design framework"):
  with members:
    - "the power of choice in priority scheduling"
    - "the lock free k lsm relaxed priority queue"
    - "a dynamic elimination combining stack algorithm"

Connected through hyperedge HE-8 (induced by source paper "path sensitive atomic commit local coordination avoidance for distributed transactions technical report"):
  with members:
    - "keeping calm when distributed consistency is easy"
    - "conflict free replicated data types crdts"

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.DB(Databases)