8.1 Introduction

Data streams are continuous flows of data being generated from various computing machines such as clients and servers in networks, sensors, call centers, and so on. Analyzing these data streams has become critical for many applications including for network data, financial data, and sensor data. However, mining these ever growing data is a big challenge to the data mining community ([CAI04], [CHEN02], [FAN04a], [GABE05], [GANT01]). Data stream classification ([CHI05], [DING02], [DOMI00], [GANT02], [GEHR99], [HULT01], [JIN03], [KUNC08], [LAST02], [MASU09a], [SCHO05], [WANG03], [WANG06], [WANG07] is one major aspect of data stream mining. Data stream classification mainly consists ...

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