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: "advances in run time performance and interoperability for the adapteva epiphany coprocessor"
  Abstract: The energy-efficient Adapteva Epiphany architecture exhibits massive many-core scalability in a physically compact 2D array of RISC cores with a fast network-on-chip (NoC). The architecture presents many features and constraints which contribute to software design challenges for the application developer. Addressing these challenges within the software stack that supports application development is critical to improving productivity and expanding the range of applications for the architecture. We report here on advances that have been made in the COPRTHR-2 software stack targeting the Epiphany architecture that address critical issues identified in previous work. Specifically, we describe improvements that bring greater control and precision to the design of compact compiled binary programs in the context of the limited per-core local memory of the architecture. We describe a new design for run-time support that has been implemented to dramatically improve the program load and execute performance and capabilities. Finally, we describe developments that advance host-coprocessor interoperability to expand the functionality available to the application developer.

Connected through hyperedge HE-1 (induced by source paper "a distributed shared memory model and c templated meta programming interface for the epiphany risc array processor"):
  with members:
    - "opencl openshmem hybrid programming model for the adapteva epiphany architecture"
    - "implementing openshmem for the adapteva epiphany risc array processor"
    - "an openshmem implementation for the adapteva epiphany coprocessor"
    - "programming the adapteva epiphany 64 core network on chip coprocessor"
    - "kickstarting high performance energy efficient manycore architectures with epiphany"

Connected through hyperedge HE-2 (induced by source paper "i can has supercomputer a novel approach to teaching parallel and distributed computing concepts using a meme based programming language"):
  with members:
    - "an openshmem implementation for the adapteva epiphany coprocessor"
    - "kickstarting high performance energy efficient manycore architectures with epiphany"

Connected through hyperedge HE-3 (induced by source paper "an openshmem implementation for the adapteva epiphany coprocessor"):
  with members:
    - "implementing openshmem for the adapteva epiphany risc array processor"
    - "parallel programming model for the epiphany many core coprocessor using threaded mpi"

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.DC(Distributed, Parallel, and Cluster Computing)