Similarity-binning averaging: a generalisation of binning calibration

  • Authors:
  • Antonio Bella;Cèsar Ferri;José Hernández-Orallo;Marïa José Ramírez-Quintana

  • Affiliations:
  • Universidad Politécnica de Valencia, DSIC, Valencia, Spain;Universidad Politécnica de Valencia, DSIC, Valencia, Spain;Universidad Politécnica de Valencia, DSIC, Valencia, Spain;Universidad Politécnica de Valencia, DSIC, Valencia, Spain

  • Venue:
  • IDEAL'09 Proceedings of the 10th international conference on Intelligent data engineering and automated learning
  • Year:
  • 2009

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Abstract

In this paper we revisit the problem of classifier calibration, motivated by the issue that existing calibration methods ignore the problem attributes (i.e., they are univariate). We propose a new calibration method inspired in binning-based methods in which the calibrated probabilities are obtained from k instances from a dataset. Bins are constructed by including the k-most similar instances, considering not only estimated probabilities but also the original attributes. This method has been tested wrt. two calibration measures, including a comparison with other traditional calibration methods. The results show that the new method outperforms the most commonly used calibration methods.