Before revision:  Next, it computes  degree of fuzzy-rough approximations and with proper degree threshold selection for undersampling of the negative samples  from all possible interaction pairs between drugs and targets obtained in the first stage.
After revision:  Next, it computes degree of fuzzy-rough approximations and with proper degree threshold selection for undersampling of the negative samples ' undersampling from all possible interaction pairs between drugs and targets obtained in the first stage.