JUCS - Journal of Universal Computer Science 11(8): 1411-1425, doi: 10.3217/jucs-011-08-1411
Online Mining Changes of Items over Continuous Append-only and Dynamic Data Streams
expand article infoHua-Fu Li, Suh-Yin Lee, Man-Kwan Shan§
‡ Department of Computer Science and Information Engineering, National Chiao-Tung University, Hsinchu 300, Taiwan§ Department of Computer Science, National Chengchi University, Taipei 116, Taiwan
Open Access
Online mining changes over data streams has been recognized to be an important task in data mining. Mining changes over data streams is both compelling and challenging. In this paper, we propose a new, single-pass algorithm, called MFC-append (Mining Frequency Changes of append-only data streams), for discovering the frequent frequency-changed items, vibrated frequency changed items, and stable frequency changed items over continuous append-only data streams. A new summary data structure, called Change-Sketch, is developed to compute the frequency changes between two continuous data streams as fast as possible.s Moreover, a MFC-append-based algorithm, called MFC-dynamic (Mining Frequency Changes of dynamic data streams), is proposed to find the frequency changes over dynamic data streams. Theoretical analysis and experimental results show that our algorithms meet the major performance requirements, namely single-pass, bounded space requirement, and real-time computing, in mining data streams.
data streams, change mining, single-pass algorithm