Japanese Predicate Conjugation for Neural Machine Translation
Table 3: BLEU scores of each experiment (average of four runs). The best score in each corpus is made bold (expect for BPE “both” and “only English”).
['Method', 'Method', 'Japanese - English NTCIR', 'Japanese - English ASPEC', 'Japanese - English Tanaka', 'English - Japanese NTCIR', 'English - Japanese ASPEC', 'English - Japanese Tanaka']
The results of BLEU score Papineni et al. Compared to the baseline without BPE, Conjugation token improved in BLEU score on all corpora and in both translation directions. In addition, Conjugation token outperformed the baselines with BPE with an exception on NTCIR in Japanese-to-English direction. When the POS token was introduced, BLEU scores improved by 1.82 points on average from the baseline in Japanese-to-English translation. (ASPEC : 0.91, Tanaka : 2.73) According to the results, Japanese-only BPE was inferior to the baseline without BPE.