“…The concept drift phenomenon may occur in various real-world data and corresponding applications ( Žliobaite, Pechenizkiy & Gama, 2016 ): - computer systems or networks, through network intrusion detection, where new techniques and methods may appear ( Liu et al, 2017 ; Mukkavilli & Shetty, 2012 );
- industry, when dynamic data streams are produced by sensors in production equipment and machines ( Lin et al, 2019 ; Zenisek, Holzinger & Affenzeller, 2019 );
- marketing and management, when users change their buying behavior and their preferences ( Black & Hickey, 2003 ; Chiang, Wang & Chu, 2013 ; Lo et al, 2018 );
- medical data, e.g., in the case of antibiotic resistance ( Stiglic & Kokol, 2011 ; Tsymbal et al, 2006 );
- social networks, when users change their behavior and generated content ( Lifna & Vijayalakshmi, 2015 ; Li et al, 2016 );
- spam categorization, where spam keywords can change over time ( Delany et al, 2005 ; Ruano-Ordás, Fdez-Riverola & Méndez, 2018 ).
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