Many recent works extended ABS by utilizing additional features (Chopra et al., 2016;Takase et al., 2016;Nallapati et al., 2016;Shen et al., 2016Shen et al., , 2017aTan et al., 2017;Guo et al., 2017).
without samples from P (A, T ), this is a challenging or even impossible task if E S and E T , or G S and G T are completely independent of each other.