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: "npefix automatic runtime repair of null pointer exceptions in java"
  Abstract: Null pointer exceptions, also known as null dereferences are the number one exceptions in the field. In this paper, we propose 9 alternative execution semantics when a null pointer exception is about to happen. We implement those alternative execution strategies using code transformation in a tool called NPEfix. We evaluate our prototype implementation on 11 field null dereference bugs and 519 seeded failures and show that NPEfix is able to repair at runtime 10/11 and 318/519 failures.

Connected through hyperedge HE-1 (induced by source paper "getafix learning to fix bugs automatically"):
  with members:
    - "learning to represent edits"
    - "deepbugs a learning approach to name based bug detection"
    - "coming a tool for mining change pattern instances from git commits"
    - "learning quick fixes from code repositories"
    - "semantic code repair using neuro symbolic transformation networks"
    - "a survey of machine learning for big code and naturalness"
    - "learning syntactic program transformations from examples"
    - "mining software repair models for reasoning on the search space of automated program fixing"

Connected through hyperedge HE-2 (induced by source paper "a comprehensive study of automatic program repair on the quixbugs benchmark"):
  with members:
    - "alleviating patch overfitting with automatic test generation a study of feasibility and effectiveness for the nopol repair system"
    - "automatic software repair a bibliography"
    - "arja automated repair of java programs via multi objective genetic programming"
    - "nopol automatic repair of conditional statement bugs in java programs"
    - "precise condition synthesis for program repair"
    - "automatic repair of real bugs an experience report on the defects4j dataset"
    - "a critical review of automatic patch generation learned from human written patches essay on the problem statement and the evaluation of automatic software repair"

Connected through hyperedge HE-3 (induced by source paper "how to design a program repair bot insights from the repairnator project"):
  with members:
    - "automatic software repair a bibliography"
    - "automatic repair of real bugs in java a large scale experiment on the defects4j dataset"
    - "nopol automatic repair of conditional statement bugs in java programs"
    - "test case generation for program repair a study of feasibility and effectiveness"
    - "an analysis of the search spaces for generate and validate patch generation systems"
    - "continuous integration in a social coding world empirical evidence from github"

Connected through hyperedge HE-4 (induced by source paper "dynamic patch generation for null pointer exceptions using metaprogramming"):
  with members:
    - "automatic software repair a bibliography"
    - "automatic repair of real bugs in java a large scale experiment on the defects4j dataset"
    - "nopol automatic repair of conditional statement bugs in java programs"
    - "an analysis of the search spaces for generate and validate patch generation systems"
    - "automatic repair of buggy if conditions and missing preconditions with smt"

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)