In contrast, the supervised datasets which have the SUD ground truth are pretty small, ranging from 896 for the intersection of the likes, status updates and SUD (LikeStatusSUD in Table 1) to 3508, which is the intersection of the likes and SUD (LikesSUD in Table 1).
the main focuses of this research include (1) employing unsuper-vised feature learning to take advantage of a large amount of unsupervised data (2) employing multiview learning to combine heterogeneous user data for better prediction.