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: "lessons learned from an experiment in crowdsourcing complex citizen engineering tasks with amazon mechanical turk"
  Abstract: MATTHEW STAFFELBACH, PETER SEMPOLINSKI, DAVID HACHEN, AHSAN KAREEM, TRACY KIJEWSKI-CORREA, DOUGLAS THAIN, DANIEL WEI AND GREGORY MADEY, University of Notre Dame INTRODUCTION 1.1 Citizen Engineering America’s dated infrastructure is failing to keep pace with its burgeoning population. In fact, the average grade in ASCE’s (American Society of Civil Engineers) 2013 report card for America’s infrastructure was a D+, with a 3.6 trillion dollar estimated investment needed by 2020 and needs for inspection and assessment that far surpass available manpower. Crowdsourcing is increasingly being seen as one potentially powerful way of increasing the supply of labor for problem solving tasks, but there are a number of concerns over the quality of the data or analysis conducted. This is a significant concern when dealing with civil infrastructure for obvious reasons: flawed data could lead to loss of lives. Our goal was to determine if workers on Mechanical Turk were capable of developing basic engineering analysis skills using only the training afforded by comprehensive tutorials and guided questionnaires.

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.SI(Social and Information Networks)