Integrating HRED with the latent variable models such as variational autoencoder (VAE) (Kingma and Welling, 2014) extends another line of advancements (Serban et al., 2016c;Zhao et al., 2017;Park et al., 2018;Le et al., 2018b).
these systems are not designed for taskoriented dialogue modeling as goal information is not considered.