A Joint Back-Translation and Transfer Learning Method for Low-Resource Neural Machine Translation

Table 3

The BLEU scores of the joint method with hierarchical transfer learning architecture separately on character-level and word-level shared vocabulary for Uygur-Chinese.

Shared vocabulary	Steps (first layer) (M)	BLEU scores
Word level	0.5	36.65
Word level	1	37.05
Character level	0.5	37.31
Character level	1	37.64