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: "2 server pir with sub polynomial communication"
  Abstract: A 2-server Private Information Retrieval (PIR) scheme allows a user to retrieve the $i$th bit of an $n$-bit database replicated among two servers (which do not communicate) while not revealing any information about $i$ to either server. In this work we construct a 1-round 2-server PIR with total communication cost $n^{O({\sqrt{\log\log n/\log n}})}$. This improves over the currently known 2-server protocols which require $O(n^{1/3})$ communication and matches the communication cost of known 3-server PIR schemes. Our improvement comes from reducing the number of servers in existing protocols, based on Matching Vector Codes, from 3 or 4 servers to 2. This is achieved by viewing these protocols in an algebraic way (using polynomial interpolation) and extending them using partial derivatives.

Connected through hyperedge HE-1 (induced by source paper "private proximity retrieval codes"):
  with members:
    - "capacity of private linear computation for coded databases"
    - "private information retrieval from mds coded data in distributed storage systems"
    - "private computation of systematically encoded data with colluding servers"
    - "private polynomial computation from lagrange encoding"
    - "achieving private information retrieval capacity in distributed storage using an arbitrary linear code"
    - "the capacity of private information retrieval from byzantine and colluding databases"
    - "private function retrieval"
    - "linear symmetric private information retrieval for mds coded distributed storage with colluding servers"

Connected through hyperedge HE-2 (induced by source paper "private information retrieval over random linear networks"):
  with members:
    - "noisy private information retrieval on separability of channel coding and information retrieval"
    - "private information retrieval from coded storage systems with colluding byzantine and unresponsive servers"
    - "private information retrieval from mds coded data in distributed storage systems"
    - "achieving private information retrieval capacity in distributed storage using an arbitrary linear code"
    - "the capacity of private information retrieval from byzantine and colluding databases"
    - "private information retrieval from mds coded data with colluding servers settling a conjecture by freij hollanti et al"
    - "secure symmetric private information retrieval from colluding databases with adversaries"
    - "t private information retrieval schemes using transitive codes"

Connected through hyperedge HE-3 (induced by source paper "capacity achieving private information retrieval codes with optimal message size and upload cost"):
  with members:
    - "an mds pir capacity achieving protocol for distributed storage using non mds linear codes"
    - "a generic transformation to enable optimal repair in mds codes for distributed storage systems"
    - "linear network coding over rings part ii vector codes and non commutative alphabets"
    - "asymmetry hurts private information retrieval under asymmetric traffic constraints"
    - "linear network coding over rings part i scalar codes and commutative alphabets"
    - "private information retrieval from mds coded data in distributed storage systems"
    - "the capacity of cache aided private information retrieval"
    - "on the placement delivery array design for centralized coded caching scheme"

Connected through hyperedge HE-4 (induced by source paper "private information retrieval in graph based replication systems"):
  with members:
    - "private information retrieval from mds coded data in distributed storage systems"
    - "private computation of systematically encoded data with colluding servers"
    - "codes for graph erasures"
    - "private information retrieval from storage constrained databases coded caching meets pir"
    - "multi message private information retrieval capacity results and near optimal schemes"
    - "codes for erasures over directed graphs"
    - "pir array codes with optimal virtual server rate"
    - "multiround private information retrieval capacity and storage overhead"

Connected through hyperedge HE-5 (induced by source paper "on sub packetization and access number of capacity achieving pir schemes for mds coded non colluding servers"):
  with members:
    - "a general private information retrieval scheme for mds coded databases with colluding servers"
    - "fundamental limits of cache aided private information retrieval with unknown and uncoded prefetching"
    - "the capacity of private information retrieval with private side information"
    - "the capacity of cache aided private information retrieval"
    - "private information retrieval with side information"
    - "capacity achieving pir schemes with optimal sub packetization"
    - "a tight lower bound on the sub packetization level of optimal access msr and mds codes"
    - "the capacity of robust private information retrieval with colluding databases"

Connected through hyperedge HE-6 (induced by source paper "private information retrieval from mds coded data in distributed storage systems"):
  with members:
    - "the capacity of private information retrieval from byzantine and colluding databases"
    - "private information retrieval from mds coded data with colluding servers settling a conjecture by freij hollanti et al"
    - "robust private information retrieval on coded data"
    - "pir array codes with optimal virtual server rate"
    - "blind interference alignment for private information retrieval"
    - "private information retrieval in distributed storage systems using an arbitrary linear code"
    - "the capacity of robust private information retrieval with colluding databases"
    - "private information retrieval from coded databases with colluding servers"

Connected through hyperedge HE-7 (induced by source paper "robust private information retrieval from coded systems with byzantine and colluding servers"):
  with members:
    - "private information retrieval from mds coded data in distributed storage systems"
    - "the capacity of private information retrieval from byzantine and colluding databases"
    - "secure symmetric private information retrieval from colluding databases with adversaries"
    - "robust private information retrieval on coded data"
    - "private information retrieval in distributed storage systems using an arbitrary linear code"
    - "the capacity of robust private information retrieval with colluding databases"
    - "private information retrieval from coded databases with colluding servers"
    - "the capacity of private information retrieval"

Connected through hyperedge HE-8 (induced by source paper "building capacity achieving pir schemes with optimal sub packetization over small fields"):
  with members:
    - "capacity achieving pir schemes with optimal sub packetization"
    - "the capacity of robust private information retrieval with colluding databases"
    - "the capacity of symmetric private information retrieval"
    - "the capacity of private information retrieval"
    - "the capacity of private information retrieval from coded databases"
    - "symmetric private information retrieval for mds coded distributed storage"
    - "optimal download cost of private information retrieval for arbitrary message length"
    - "private information retrieval for coded storage"

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.CC(Computational Complexity)