arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1804.07155cs.CVcs.LGstat.ML
收藏

实例选择提高几何平均精度:不平衡数据分类研究

Instance Selection Improves Geometric Mean Accuracy: A Study on Imbalanced Data Classification

Bangor University(班戈大学);Universidad de Burgos(布尔戈斯大学);Middlesex University(密德萨斯大学)

Ludmila I. Kuncheva, Álvar Arnaiz-González, José-Francisco Díez-Pastor, Iain A. D. Gunn

摘要:

处理不平衡数据的一种自然方法是尝试均衡类频率并在平衡数据上训练选择的分类器。对于两类不平衡问题,分类成功率通常由真阳性率和真阴性率的几何平均值(GM)来衡量。在这里,我们证明了GM模型可以通过实例选择来改进,并给出了这种改进的理论条件。我们证明,GM是非单调的保留实例的数量,这阻碍了系统的实例选择。我们还表明,平衡的分布频率是劣于直接最大化的GM。为了验证我们的理论研究结果,我们进行了实验研究的12个实例选择方法的不平衡数据,使用66个标准的基准数据集。结果揭示了新的实例选择方法的不平衡数据的可能空间。

英文摘要:

A natural way of handling imbalanced data is to attempt to equalise the class frequencies and train the classifier of choice on balanced data. For two-class imbalanced problems, the classification success is typically measured by the geometric mean (GM) of the true positive and true negative rates. Here we prove that GM can be improved upon by instance selection, and give the theoretical conditions for such an improvement. We demonstrate that GM is non-monotonic with respect to the number of retained instances, which discourages systematic instance selection. We also show that balancing the distribution frequencies is inferior to a direct maximisation of GM. To verify our theoretical findings, we carried out an experimental study of 12 instance selection methods for imbalanced data, using 66 standard benchmark data sets. The results reveal possible room for new instance selection methods for imbalanced data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑