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: "extasy scalable and flexible coupling of md simulations and advanced sampling techniques"
  Abstract: For many macromolecular systems the accurate sampling of the relevant regions on the potential energy surface cannot be obtained by a single, long Molecular Dynamics (MD) trajectory. New approaches are required to promote more efficient sampling. We present the design and implementation of the Extensible Toolkit for Advanced Sampling and analYsis (ExTASY) for building and executing advanced sampling workflows on HPC systems. ExTASY provides Python based "templated scripts" that interface to an interoperable and high-performance pilot-based run time system, which abstracts the complexity of managing multiple simulations. ExTASY supports the use of existing highly-optimised parallel MD code and their coupling to analysis tools based upon collective coordinates which do not require a priori knowledge of the system to bias. We describe two workflows which both couple large "ensembles" of relatively short MD simulations with analysis tools to automatically analyse the generated trajectories and identify molecular conformational structures that will be used on-the-fly as new starting points for further "simulation-analysis" iterations. One of the workflows leverages the Locally Scaled Diffusion Maps technique; the other makes use of Complementary Coordinates techniques to enhance sampling and generate start-points for the next generation of MD simulations. We show that the ExTASY tools have been deployed on a range of HPC systems including ARCHER (Cray CX30), Blue Waters (Cray XE6/XK7), and Stampede (Linux cluster), and that good strong scaling can be obtained up to 1000s of MD simulations, independent of the size of each simulation. We discuss how ExTASY can be easily extended or modified by end-users to build their own workflows, and ongoing work to improve the usability and robustness of ExTASY.

Connected through hyperedge HE-1 (induced by source paper "radical cybertools middleware building blocks for scalable science"):
  with members:
    - "rapid concurrent and adaptive extreme scale binding free energy calculation"
    - "repex a flexible framework for scalable replica exchange molecular dynamics simulations"
    - "using pilot systems to execute many task workloads on supercomputers"
    - "integrating abstractions to enhance the execution of distributed applications"

Connected through hyperedge HE-2 (induced by source paper "middleware building blocks for workflow systems"):
  with members:
    - "microservices yesterday today and tomorrow"
    - "hadoop on hpc integrating hadoop and pilot based dynamic resource management"
    - "a comprehensive perspective on pilot job systems"
    - "scientific computing meets big data technology an astronomy use case"

Connected through hyperedge HE-3 (induced by source paper "task parallel analysis of molecular dynamics trajectories"):
  with members:
    - "high throughput binding affinity calculations at extreme scales"
    - "hadoop on hpc integrating hadoop and pilot based dynamic resource management"
    - "repex a flexible framework for scalable replica exchange molecular dynamics simulations"
    - "using pilot systems to execute many task workloads on supercomputers"
    - "a comprehensive perspective on pilot job systems"
    - "mllib machine learning in apache spark"
    - "a tale of two data intensive paradigms applications abstractions and architectures"
    - "p a model of pilot abstractions"

Connected through hyperedge HE-4 (induced by source paper "pilot streaming a stream processing framework for high performance computing"):
  with members:
    - "hadoop on hpc integrating hadoop and pilot based dynamic resource management"
    - "radical pilot scalable execution of heterogeneous and dynamic workloads on supercomputers"
    - "mllib machine learning in apache spark"
    - "a tale of two data intensive paradigms applications abstractions and architectures"
    - "p a model of pilot abstractions"

Connected through hyperedge HE-5 (induced by source paper "design and performance characterization of radical pilot on titan"):
  with members:
    - "repex a flexible framework for scalable replica exchange molecular dynamics simulations"
    - "synapse bridging the gap towards predictable workload placement"

Connected through hyperedge HE-6 (induced by source paper "high throughput binding affinity calculations at extreme scales"):
  with members:
    - "rapid concurrent and adaptive extreme scale binding free energy calculation"
    - "converging high throughput and high performance computing a case study"
    - "ensemble toolkit scalable and flexible execution of ensembles of tasks"
    - "analysis of distributed execution of workloads"
    - "repex a flexible framework for scalable replica exchange molecular dynamics simulations"

Connected through hyperedge HE-7 (induced by source paper "designing workflow systems using building blocks"):
  with members:
    - "synapse synthetic application profiler and emulator"
    - "converging high throughput and high performance computing a case study"
    - "microservices yesterday today and tomorrow"
    - "ensemble toolkit scalable and flexible execution of ensembles of tasks"
    - "analysis of distributed execution of workloads"
    - "repex a flexible framework for scalable replica exchange molecular dynamics simulations"
    - "executing dynamic and heterogeneous workloads on super computers"
    - "integrating abstractions to enhance the execution of distributed applications"

Connected through hyperedge HE-8 (induced by source paper "ensemble toolkit scalable and flexible execution of ensembles of tasks"):
  with members:
    - "repex a flexible framework for scalable replica exchange molecular dynamics simulations"
    - "radical pilot scalable execution of heterogeneous and dynamic workloads on supercomputers"
    - "integrating abstractions to enhance the execution of distributed applications"

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.CE(Computational Engineering, Finance, and Science)