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• W3178061567 abstract "Defect prediction aims to automatically identify potential defective code with minimal human intervention and has been widely studied in the literature. Just-in-Time (JIT) defect prediction focuses on program changes rather than whole programs, and has been widely adopted in continuous testing. CC2Vec, state-of-the-art JIT defect prediction tool, first constructs a hierarchical attention network (HAN) to learn distributed vector representations of both code additions and deletions, and then concatenates them with two other embedding vectors representing commit messages and overall code changes extracted by the existing DeepJIT approach to train a model for predicting whether a given commit is defective. Although CC2Vec has been shown to be the state of the art for JIT defect prediction, it was only evaluated on a limited dataset and not compared with all representative baselines. Therefore, to further investigate the efficacy and limitations of CC2Vec, this paper performs an extensive study of CC2Vec on a large-scale dataset with over 310,370 changes (8.3 X larger than the original CC2Vec dataset). More specifically, we also empirically compare CC2Vec against DeepJIT and representative traditional JIT defect prediction techniques. The experimental results show that CC2Vec cannot consistently outperform DeepJIT, and neither of them can consistently outperform traditional JIT defect prediction. We also investigate the impact of individual traditional defect prediction features and find that the added-line-number feature outperforms other traditional features. Inspired by this finding, we construct a simplistic JIT defect prediction approach which simply adopts the added-line-number feature with the logistic regression classifier. Surprisingly, such a simplistic approach can outperform CC2Vec and DeepJIT in defect prediction, and can be 81k X/120k X faster in training/testing. Furthermore, the paper also provides various practical guidelines for advancing JIT defect prediction in the near future." @default.
• W3178061567 created "2021-07-19" @default.
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• W3178061567 date "2021-07-11" @default.
• W3178061567 modified "2023-10-06" @default.
• W3178061567 title "Deep just-in-time defect prediction: how far are we?" @default.
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• W3178061567 doi "https://doi.org/10.1145/3460319.3464819" @default.
• W3178061567 hasPublicationYear "2021" @default.
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