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Online Active Learning Ensemble Framework for Drifted Data Streams

IEEE transaction on neural networks and learning systems, 2019-02, Vol.30 (2), p.486-498

ISSN: 2162-237X ;EISSN: 2162-2388 ;DOI: 10.1109/TNNLS.2018.2844332 ;CODEN: ITNNAL

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  • Title:
    Online Active Learning Ensemble Framework for Drifted Data Streams
  • Author: Shan, Jicheng ; Zhang, Hang ; Liu, Weike ; Liu, Qingbao
  • Subjects: Active learning ; Bagging ; Boosting ; classifier ensemble ; Computational efficiency ; concept drift ; data stream ; Labeling ; Monitoring ; Training
  • Is Part Of: IEEE transaction on neural networks and learning systems, 2019-02, Vol.30 (2), p.486-498
  • Description: In practical applications, data stream classification faces significant challenges, such as high cost of labeling instances and potential concept drifting. We present a new online active learning ensemble framework for drifting data streams based on a hybrid labeling strategy that includes the following: 1) an ensemble classifier, which consists of a long-term stable classifier and multiple dynamic classifiers (a multilevel sliding window model is used to create and update the dynamic classifiers to effectively process both the gradual drift type and sudden drift type data stream) and 2) active learning, which takes a nonfixed labeling budget, supports on-demand request labeling, and adopts an uncertainty strategy and random strategy to label instances. The decision threshold of the uncertainty strategy is adjusted dynamically, i.e., when concept drift occurs, the threshold is gradually reduced to query the most uncertain instances in priority to reduce the request expense as much as possible. Experiments on synthetic and real data sets show that precise prediction accuracy can be obtained by the proposed method without increasing the total cost of labeling, and that the labeling cost can be dynamically allocated according to the concept drift.
  • Publisher: IEEE
  • Language: English
  • Identifier: ISSN: 2162-237X
    EISSN: 2162-2388
    DOI: 10.1109/TNNLS.2018.2844332
    CODEN: ITNNAL
  • Source: IEEE Open Access Journals
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