Extracting Hidden Context

  • Authors:
  • Michael Bonnell Harries;Claude Sammut;Kim Horn

  • Affiliations:
  • Department of Artificial Intelligence, School of Computer Science and Engineering, University of NSW, Sydney, 2052, Australia. E-mail: mbh@cse.unsw.edu.au, claude@cse.unsw.edu.au;Department of Artificial Intelligence, School of Computer Science and Engineering, University of NSW, Sydney, 2052, Australia. E-mail: mbh@cse.unsw.edu.au, claude@cse.unsw.edu.au;RMB Australia Limited, Level 5 Underwood House, 37-47 Pitt Street, Sydney, 2000, Australia. E-mail: kim@rmb.com.au

  • Venue:
  • Machine Learning - Special issue on context sensitivity and concept drift
  • Year:
  • 1998

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Abstract

Concept drift due to hidden changes in context complicates learningin many domains including financial prediction, medical diagnosis, andcommunication network performance. Existing machine learning approaches tothis problem use an incremental learning, on-line paradigm. Batch, off-linelearners tend to be ineffective in domains with hidden changes in context asthey assume that the training set is homogeneous. An off-line, meta-learning approach for the identification of hidden context ispresented. The new approach uses an existing batch learner and the processof {\it contextual clustering} to identify stable hiddencontexts and the associated context specific, locally stable concepts. Theapproach is broadly applicable to the extraction of context reflected intime and spatial attributes. Several algorithms for the approach arepresented and evaluated. A successful application of the approach to acomplex flight simulator control task is also presented.