RNN-based NMT model
We first briefly introduce the RNN based Neural Machine Translation (RNN-based NMT) model. Transformer-NMT
Recently, the Transformer model BIBREF4 has made remarkable progress in machine translation. This model contains a multi-head self-attention encoder and a multi-head self-attention decoder. 
 Question: what NMT models did they compare with?
RNN-based NMT model Transformer-NMT