Table 2. BLEU scores for different MT systems.

Methods	IWSLT	Europarl	News commentary	WMT
NMT	34.21	32.15	21.32	18.24
PBMT	35.61	33.82	22.03	19.51
HMMT	35.12	32.87	21.68	18.92
iNMT	36.92	34.73	23.17	30.76