Fig. 4.

The negative example set N2 is obtained with the second iteration In figure 4, plus signs, plus signs with circle and circles denote positive examples, potential positive examples and unlabeled examples respectively. The points covered by ellipse are negative example set N2 and the line is classification hyperplane.With the new training set N1, the SVM classifier C1 is learned, the negative example set N2 consists of the support vectors of C1 and the unlabeled examples predicted as negative examples.

Chen et al. BMC Genomics 2010 11(Suppl 2):S11   doi:10.1186/1471-2164-11-S2-S11