Evaluating Chinese-Vietnamese Low-resource Machine Translation with Back Translation
Table 5: Results of word-based NMT
['Directions Settings', 'zh\\rightarrowvi BLEU', 'zh\\rightarrowvi METEOR', 'vi\\rightarrowzh BLEU', 'vi\\rightarrowzh METEOR']
Similar to the Chinese data in character-based Chinese to Vietnamese NMT, the best BLEU scores of two directions with synthetic Vietnamese data are in the middle size setting (80k), and the scores also increase but then decrease, while the best scores of METEOR are in the largest data group. The results here show that synthetic Vietnamese data have certain positive impacts on achieving improvements of the translation performance compared with baseline under word-based setting.