Fig. 1
![Fig. 1](http://media.springernature.com/full/springer-static/image/art%3A10.1007%2Fs13173-012-0069-3/MediaObjects/13173_2012_69_Article_Fig1_HTML.gif)
Uncertainty region (shaded). n represents labeled instances from class n and x represents unlabeled instances. We assume that the concept to learn has three distinct classes, one of which has not yet been identified
Uncertainty region (shaded). n represents labeled instances from class n and x represents unlabeled instances. We assume that the concept to learn has three distinct classes, one of which has not yet been identified