Accuracy computation

If you intend to compare the OPF classifier using LibOPF with others in the literature, you need to pay attention to our measure of accuracy. The accuracy of a classifier can be measured in any set: training, evaluation, and test. The accuracy in LibOPF is measured by taking into account that the classes may have different sizes. If there are two classes, for example, with very different sizes and a classifier always assigns the label of the largest class, its accuracy will fall drastically due to the high error rate on the smallest class. The details about the formula of accuracy are given in http://www.ic.unicamp.br/~afalcao/libopf/node3.html.