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: "through a gender lens an empirical study of emoji usage over large scale android users"
  Abstract: Emojis have gained incredible popularity in recent years and become a new ubiquitous language for Computer-Mediated Communication (CMC) by worldwide users. Various research efforts have been made to understand the behaviors of using emojis. Gender-specific study is always meaningful for HCI community, however, so far we know very little about whether and how much males and females vary in emoji usage. To bridge such a knowledge gap, this paper makes the first effort to explore the emoji usage through a gender lens. Our analysis is based on the largest data set to date, which covers 134,419 users from 183 countries, along with their over 401 million messages collected in three months. We conduct a multi-dimensional statistical analysis from various aspects of emoji usage, including the frequency, preferences, input patterns, public/private CMC-scenario patterns, temporal patterns, and sentiment patterns. The results demonstrate that emoji usage can significantly vary between males and females. Accordingly, we propose some implications that can raise useful insights to HCI community.

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.HC(Human-Computer Interaction)