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: "are happy developers more productive"
  Abstract: For decades now, it has been claimed that a way to improve software developers’ productivity is to focus on people. Indeed, while human factors have been recognized in Software Engineering research, few empirical investigations have attempted to verify the claim. Development tasks are undertaken through cognitive processing abilities. Affective states – emotions, moods, and feelings - have an impact on work-related behaviors, cognitive processing activities, and the productivity of individuals. In this paper, we report an empirical study on the impact of affective states on software developers’ performance while programming. Two affective states dimensions are positively correlated with self-assessed productivity. We demonstrate the value of applying psychometrics in Software Engineering studies and echo a call to valorize the human, individualized aspects of software developers. We introduce and validate a measurement instrument and a linear mixed-effects model to study the correlation of affective states and the productivity of software developers.

Connected through hyperedge HE-1 (induced by source paper "an empirical assessment on affective reactions of novice developers when applying test driven development"):
  with members:
    - "what happens when software developers are un happy"
    - "a dissection of the test driven development process does it really matter to test first or to test last"
    - "mining valence arousal and dominance possibilities for detecting burnout and productivity"

Connected through hyperedge HE-2 (induced by source paper "using experience sampling to link software repositories with emotions and work well being"):
  with members:
    - "a systematic review of productivity factors in software development"
    - "a benchmark study on sentiment analysis for software engineering research"
    - "need for sleep the impact of a night of sleep deprivation on novice developers performance"
    - "bootstrapping a lexicon for emotional arousal in software engineering"
    - "understanding the affect of developers theoretical background and guidelines for psychoempirical software engineering"

Connected through hyperedge HE-3 (induced by source paper "toward a better understanding of how to develop software under stress drafting the lines for future research"):
  with members:
    - "happy software developers solve problems better psychological measurements in empirical software engineering"

Connected through hyperedge HE-4 (induced by source paper "towards a theory of affect and software developers performance"):
  with members:
    - "understanding the affect of developers theoretical background and guidelines for psychoempirical software engineering"
    - "in need of creative mobile service ideas forget adults and ask young children"
    - "software developers moods emotions and performance"
    - "a framework for systematic analysis of open access journals and its application in software engineering and information systems"
    - "happy software developers solve problems better psychological measurements in empirical software engineering"
    - "the role of emotions in contributors activity a case study on the gentoo community"
    - "commitment nets in software process improvement"

Connected through hyperedge HE-5 (induced by source paper "understanding the affect of developers theoretical background and guidelines for psychoempirical software engineering"):
  with members:
    - "the affect of software developers common misconceptions and measurements"
    - "do feelings matter on the correlation of affects and the self assessed productivity in software engineering"
    - "software developers moods emotions and performance"
    - "happy software developers solve problems better psychological measurements in empirical software engineering"
    - "the dynamics of creativity in software development"

Connected through hyperedge HE-6 (induced by source paper "do feelings matter on the correlation of affects and the self assessed productivity in software engineering"):
  with members:
    - "happy software developers solve problems better psychological measurements in empirical software engineering"

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.SE(Software Engineering)