Twin support vector machine with Universum data

The Universum, which is defined as the sample not belonging to either class of the classification problem of interest, has been proved to be helpful in supervised learning. In this work, we designed a new Twin Support Vector Machine with Universum (called UU-TSVM), which can utilize Universum data to improve the classification performance of TSVM. Unlike UU-SVM, in UU-TSVM, Universum data are located in a nonparallel insensitive loss tube by using two Hinge Loss functions, which can exploit these prior knowledge embedded in Universum data more flexible. Empirical experiments demonstrate that UU-TSVM can directly improve the classification accuracy of standard TSVM that use the labeled data alone and is superior to UU-SVM in most cases.