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arXiv 1801.01899cs.LGstat.ML
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去除离群点的聚类

Clustering with Outlier Removal

Brandeis University(布兰迪斯大学);Massachusetts Institute of Technology(麻省理工学院);Northeastern University(东北大学)

Hongfu Liu, Jun Li, Yue Wu, Yun Fu

摘要:

聚类分析和孤立点检测是数据采掘领域中的两个强耦合任务。簇结构很容易被少数离群点破坏;相反,离群点是由簇的概念定义的,它被认为是不属于任何簇的点。遗憾的是,大多数现有的研究没有注意到这两个任务之间的耦合关系,并单独处理。鉴于此,我们考虑了联合聚类分析和孤立点检测问题,提出了带孤立点去除的聚类(COR)算法。一般来说,通过生成基本划分将原始空间转化为二进制空间,以定义聚类。然后设计了一个基于全息熵的目标函数,在去除少量离群点的同时提高了聚类的紧凑性。通过对目标函数的进一步分析,发现K-均值优化只能处理部分问题。为了提供一个综合的解决方案,一个辅助的二进制矩阵nontrivally引入,使COR完全有效地解决了具有挑战性的问题,通过统一的K-均值-理论支持。在不同领域的大量数据集上进行的大量实验结果表明,COR在聚类有效性和离群点检测方面的有效性和效率明显优于最先进的方法。进一步分析了COR中的一些关键因素,以供实际应用。最后,通过飞行轨迹的仿真验证了COR算法的有效性。

英文摘要:

Cluster analysis and outlier detection are strongly coupled tasks in data mining area. Cluster structure can be easily destroyed by few outliers; on the contrary, outliers are defined by the concept of cluster, which are recognized as the points belonging to none of the clusters. Unfortunately, most existing studies do not notice the coupled relationship between these two task and handle them separately. In light of this, we consider the joint cluster analysis and outlier detection problem, and propose the Clustering with Outlier Removal (COR) algorithm. Generally speaking, the original space is transformed into the binary space via generating basic partitions in order to define clusters. Then an objective function based Holoentropy is designed to enhance the compactness of each cluster with a few outliers removed. With further analyses on the objective function, only partial of the problem can be handled by K-means optimization. To provide an integrated solution, an auxiliary binary matrix is nontrivally introduced so that COR completely and efficiently solves the challenging problem via a unified K-means-- with theoretical supports. Extensive experimental results on numerous data sets in various domains demonstrate the effectiveness and efficiency of COR significantly over state-of-the-art methods in terms of cluster validity and outlier detection. Some key factors in COR are further analyzed for practical use. Finally, an application on flight trajectory is provided to demonstrate the effectiveness of COR in the real-world scenario.

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。

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