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: "capacity achieving pir schemes with optimal sub packetization"
  Abstract: Suppose a database containing $M$ records is replicated across $N$ servers, and a user wants to privately retrieve one record by accessing the servers such that identity of the retrieved record is secret against any up to $T$ servers. A scheme designed for this purpose is called a private information retrieval (PIR) scheme. In practice, capacity-achieving and small sub-packetization are both desired for PIR schemes, because the former implies the highest download rate and the latter usually means simple realization. #R##N#For general values of $N,T,M$, the only known capacity-achieving PIR scheme was designed by Sun and Jafar in 2016 with sub-packetization $N^M$. In this paper, we design a linear capacity-achieving PIR scheme with much smaller sub-packetization $dn^{M-1}$, where $d={\rm gcd}(N,T)$ and $n=N/d$. Furthermore, we prove that for any linear capacity-achieving PIR scheme it must have sub-packetization no less than $dn^{M-1}$, implying our scheme has the optimal sub-packetization. Moreover, comparing with Sun and Jafar's scheme, our scheme reduces the field size by a factor of $\frac{1}{Nd^{M-2}}$.

Connected through hyperedge HE-1 (induced by source paper "towards the capacity of private information retrieval from coded and colluding servers"):
  with members:
    - "on the capacity of private information retrieval from coded colluding and adversarial servers"
    - "lifting private information retrieval from two to any number of messages"
    - "private information retrieval from coded storage systems with colluding byzantine and unresponsive servers"
    - "on the capacity of single server multi message private information retrieval with side information"
    - "capacity of single server single message private information retrieval with coded side information"
    - "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"

Connected through hyperedge HE-2 (induced by source paper "on the capacity of private information retrieval from coded colluding and adversarial servers"):
  with members:
    - "capacity achieving private information retrieval codes from mds coded databases with minimum message size"
    - "private information retrieval from coded storage systems with colluding byzantine and unresponsive servers"
    - "on the capacity of single server multi message private information retrieval with side information"
    - "capacity of single server single message private information retrieval with coded side information"
    - "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 "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"
    - "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"
    - "the capacity of symmetric private information retrieval"

Connected through hyperedge HE-4 (induced by source paper "building capacity achieving pir schemes with optimal sub packetization over small fields"):
  with members:
    - "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"
    - "2 server pir with sub polynomial communication"

Connected through hyperedge HE-5 (induced by source paper "on sub packetization of capacity achieving pir schemes for mds coded databases"):
  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"
    - "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"
    - "the capacity of symmetric private information retrieval"

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)