Translating Phrases in Neural Machine Translation
Table 5: Additional experiment results on the translation task to directly measure the improvement obtained by the phrase generation. “+NULL” denotes that we replace the generated target phrases with a special symbol “NULL” in test sets. BLEU scores in the table are case insensitive.
['SYSTEM', 'Test']
To directly measure the improvement obtained by the phrase generation, we replace the generated target phrases with a special symbol “NULL” in test sets. and (“+memory”) translation performances decrease by 2.74 BLEU points and 1.32 BLEU points respectively. Moreover, translation performances on NIST08 decrease less than those on NIST04 and NIST05 in both settings. The overall results demonstrate that neural machine translation benefits from phrase translation.