And the baseline models are Seq2Seq+Attn (Luong et al., 2015) , Pointer to Unknown (Ptr-Unk, Gulcehre et al. (2016) ), <cite>Mem2Seq</cite> <cite>(Madotto et al., 2018)</cite> , Hierarchical Pointer Generator Memory Network (HyP-MN, Raghu et al. (2018) ) and Global-to-Local Memory Pointer (GLMP, Wu et al. (2019) ).