HRED+KVmem (Saha et al., 2018) and D2A (Guo et al., 2018) are two typical approaches, and we compared them with our proposed approach.
hRED+KVmem is a memory network (Sukhbaatar et al., 2015;Li et al., 2017) based seq2seq model, which combines hRED model (Serban et al., 2016) with keyvalue memory network (Miller et al., 2016).