Exploiting contexts to deal with uncertainty in classification
Bianca Zadrozny, Gisele Lobo Pappa, Wagner Meira, Marcos André Gonçalves, Leonardo Rocha, Thiago Salles · 2009
Uncertainty is often inherent to data and still there are just a few data mining algorithms that handle it. In this paper we focus on how to account for uncertainty in classification algorithms, in particular when data attributes should not be considered completely truthful for classifying a given sample. Our starting point is that each piece of data comes from a potentially different context and, by estimating context probabilities of an unknown sample, we may derive a weight that quantifies their influence. We propose a lazy classification strategy that incorporates the uncertainty into both the training and usage of classifiers. We also propose uK-NN, an extension of the traditional K-NN that implements our approach. Finally, we illustrate uK-NN, which is currently being evaluated experimentally, using a document classification toy example.