The margin of an example is then the scaled distance between 0.5 and its probabilistic prediction . We also consider 2 scenarios . In scenario M1 , we put higher costs on examples with lower margins . From Table 1 , ALC is better than LC in this scenario . BLC performs better than both ALC and LC on data set 2 , and performs the second best among the active learning algorithms on data sets 1 and 3 .