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: "pir schemes with small download complexity and low storage requirements"
  Abstract: In the classical model for (information theoretically secure) Private Information Retrieval (PIR), a user wishes to retrieve one bit of a database that is stored on a set of $n$ servers, in such a way that no individual server gains information about which bit the user is interested in. The aim is to design schemes that minimise communication between the user and the servers. More recently, there have been moves to consider more realistic models where the total storage of the set of servers, or the per server storage, should be minimised (possibly using techniques from distributed storage), and where the database is divided into $R$-bit records with $R>1$, and the user wishes to retrieve one record rather than one bit. When $R$ is large, downloads from the servers to the user dominate the communication complexity and so the aim is to minimise the total number of downloaded bits. Shah, Rashmi and Ramchandran show that at least $R+1$ bits must be downloaded from servers in the worst case, and provide PIR schemes meeting this bound. Sun and Jafar determine the best asymptotic download cost of a PIR scheme (as $R\rightarrow\infty$), where this cost is defined as the ratio of the message length $R$ and the total number of bits downloaded. #R##N#This paper provides various bounds on the download complexity of a PIR scheme, generalising those of Shah et al. to the case when the number $n$ of servers is bounded, and providing links with classical techniques due to Chor et al. The paper also provides a range of constructions for PIR schemes that are either simpler or perform better than previously known schemes, including explicit schemes that achieve the best asymptotic download complexity of Sun and Jafar with significantly lower upload complexity, and general techniques for constructing a scheme with good worst case download complexity from a scheme with good download complexity on average.

Connected through hyperedge HE-1 (induced by source paper "private information retrieval from locally repairable databases with colluding servers"):
  with members:
    - "maximally recoverable codes with hierarchical locality"
    - "one shot pir refinement and lifting"
    - "private information retrieval over networks"
    - "private information retrieval from mds coded data in distributed storage systems"
    - "a general private information retrieval scheme for mds coded databases with colluding servers"
    - "skew and linearized reed solomon codes and maximum sum rank distance codes over any division ring"
    - "private information retrieval from mds coded data with colluding servers settling a conjecture by freij hollanti et al"
    - "bounds and constructions of codes with multiple localities"

Connected through hyperedge HE-2 (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-3 (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-4 (induced by source paper "on the access complexity of pir schemes"):
  with members:
    - "the capacity of private information retrieval from uncoded storage constrained databases"
    - "private information retrieval from mds coded data in distributed storage systems"
    - "private information retrieval from transversal designs"
    - "on sub packetization of capacity achieving pir schemes for mds coded databases"
    - "the capacity of private information retrieval"
    - "the capacity of private information retrieval from coded databases"
    - "optimal download cost of private information retrieval for arbitrary message length"
    - "private information retrieval for coded storage"

Connected through hyperedge HE-5 (induced by source paper "multi file private information retrieval from mds coded databases with colluding servers"):
  with members:
    - "private information retrieval from mds coded data in distributed storage systems"
    - "a general private information retrieval scheme for mds coded databases with colluding servers"
    - "the capacity of private information retrieval with partially known private side information"
    - "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"
    - "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"

Connected through hyperedge HE-6 (induced by source paper "a general private information retrieval scheme for mds coded databases with colluding servers"):
  with members:
    - "private information retrieval from mds coded data in distributed storage systems"
    - "nearly optimal constructions of pir and batch codes"
    - "private information retrieval from mds coded data with colluding servers settling a conjecture by freij hollanti et al"
    - "private information retrieval schemes for coded data with arbitrary collusion patterns"
    - "multi message private information retrieval capacity results and near optimal schemes"
    - "binary shortened projective reed muller codes for coded private information retrieval"
    - "pir array codes with optimal virtual server rate"
    - "multiround private information retrieval capacity and storage overhead"

Connected through hyperedge HE-7 (induced by source paper "t private information retrieval schemes using transitive codes"):
  with members:
    - "on the fundamental limit of private information retrieval for coded distributed storage"
    - "private information retrieval from mds coded data in distributed storage systems"
    - "private information retrieval from mds coded data with colluding servers settling a conjecture by freij hollanti et al"
    - "private information retrieval schemes for coded data with arbitrary collusion patterns"
    - "achieving maximum distance separable private information retrieval capacity with linear codes"
    - "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-8 (induced by source paper "pir array codes with optimal virtual server rate"):
  with members:
    - "private information retrieval from mds coded data in distributed storage systems"
    - "nearly optimal constructions of pir and batch codes"
    - "private information retrieval from mds coded data with colluding servers settling a conjecture by freij hollanti et al"
    - "locality and availability of array codes constructed from subspaces"
    - "lower bound on the redundancy of pir codes"
    - "pir array codes with optimal pir rate"
    - "private information retrieval from coded databases with colluding servers"
    - "vector network coding based on subspace codes outperforms scalar linear network coding"

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.IT(Information Theory)