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: "when can helper node selection improve regenerating codes part ii an explicit exact repair code construction"
  Abstract: Part I of this work answered the following fundamental question: Under and only under what (n,k,d) values does proactively choosing the helper nodes improve the storage-bandwidth tradeoff of regenerating codes (RCs)? A critical component of the achievability results in Part I is a low-complexity helper selection solution, termed the family helper selection (FHS) scheme. In Part I, FHS was proved to be optimal or weakly optimal (depending on the underlying scenario) based on the assumption that as long as the minimum min-cut value of FHS is no less than the file size, we can always find a distributed storage code that can reconstruct the original file. This work relaxes this assumption by providing an exact-repair code construction that attains the minimum-bandwidth-regenerating (MBR) point of FHS, previously calculated/predicted only by the min-cut analysis in Part I. As an outcome, for the MBR points, FHS is indeed optimal or weakly optimal under various scenarios. #R##N#In addition to closing the loop of the graph-based study in Part I, the proposed construction can also be viewed as a generalization of the existing fractional repetition (FR) codes. FR codes are exact-repair codes that admit the highly-desirable repair-by-transfer property. However, the unique construction of FR codes limits its application to a restricted set of (n,k,d) system parameters. In contrast, our new construction, termed the generalized FR (GFR) codes, can be applied to arbitrary (n,k,d) values. Our GFR codes retain most of the practical benefits of FR codes, i.e., being exact-repair and being almost repairable-by-transfer.

Connected through hyperedge HE-1 (induced by source paper "explicit constructions of optimal access mds codes with nearly optimal sub packetization"):
  with members:
    - "optimal repair of reed solomon codes achieving the cut set bound"
    - "progress on high rate msr codes enabling arbitrary number of helper nodes"
    - "minimum storage regenerating codes for all parameters"
    - "when can helper node selection improve regenerating codes part i graph based analysis"
    - "an explicit coupled layer construction of a high rate msr code with low sub packetization level small field size and all node repair"
    - "explicit constructions of high rate mds array codes with optimal repair bandwidth"
    - "a high rate msr code with polynomial sub packetization level"
    - "repairing reed solomon codes"

Connected through hyperedge HE-2 (induced by source paper "locally repairable regenerating code constructions"):
  with members:
    - "when can helper node selection improve regenerating codes part i graph based analysis"
    - "when locally repairable codes meet regenerating codes what if some helpers are unavailable"
    - "locally repairable regenerating codes node unavailability and the insufficiency of stationary local repair"
    - "optimal locally repairable and secure codes for distributed storage systems"

Connected through hyperedge HE-3 (induced by source paper "when locally repairable codes meet regenerating codes what if some helpers are unavailable"):
  with members:
    - "when can helper node selection improve regenerating codes part i graph based analysis"
    - "when and by how much can helper node selection improve regenerating codes"
    - "optimal locally repairable and secure codes for distributed storage systems"
    - "characterizing the rate region of the 4 3 3 exact repair regenerating codes"
    - "replication based storage systems with local repair"
    - "locally repairable codes with multiple repair alternatives"
    - "explicit mbr all symbol locality codes"
    - "distributed storage codes with repair by transfer and nonachievability of interior points on the storage bandwidth tradeoff"

Connected through hyperedge HE-4 (induced by source paper "locally repairable regenerating codes node unavailability and the insufficiency of stationary local repair"):
  with members:
    - "when can helper node selection improve regenerating codes part i graph based analysis"
    - "locally repairable regenerating code constructions"
    - "optimal locally repairable and secure codes for distributed storage systems"
    - "characterizing the rate region of the 4 3 3 exact repair regenerating codes"
    - "locally repairable codes with multiple repair alternatives"
    - "explicit mbr all symbol locality codes"
    - "distributed storage codes with repair by transfer and nonachievability of interior points on the storage bandwidth tradeoff"
    - "optimal linear codes with a local error correction property"

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)