Adaptive selection of ensembles for imbalanced class distributions

Radtke, Paulo V. W., Granger, Éric, Sabourin, Robert and Gorodnichy, Dmitry. 2012. « Adaptive selection of ensembles for imbalanced class distributions ». In 21st International Conference on Pattern Recognition (ICPR) (Tsukuba, Japan, Nov. 11-15, 2012) pp. 2980-2984. Piscataway, NJ : Institute of Electrical and Electronics Engineers Inc..
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Abstract

Boolean combination (BC) techniques have been shown to efficiently integrate the responses of multiple classifiers in the ROC space for improved accuracy and reliability. Although the impact on classification performance of imbalanced class distributions may be addressed using ensemble-based techniques, it is difficult to observe with ROC curves. Given a false alarm rate and class imbalance, performing BC in the Precision-Recall Operating Characteristic (PROC) space can lead to a higher level of performance. In practice, class distributions often change over time, and BCs should adapt to reflect operational conditions. Thus, this paper proposes an adaptive system that initially uses skewed data to generate several BCs in the PROC space. Then, during operations, the class imbalance is periodically estimated, and used to estimate the most accurate BC of classifiers among operational points of these curves. Simulation results indicate that this approach maintains a level of accuracy that is comparable to full Boolean re-combination, but for a significantly lower computational cost.

Item Type:	Conference proceeding
ISBN:	10514651
Professor:	Professor Granger, Éric Sabourin, Robert
Affiliation:	Génie de la production automatisée
Date Deposited:	24 Jul 2013 20:43
Last Modified:	28 Jan 2016 22:55
URI:	https://espace2.etsmtl.ca/id/eprint/5090

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