Neural Network Machine Translation Method Based on Unsupervised Domain Adaptation

Table 1

Comparison of experimental results of different vocabulary sizes.

Conversion of different languages	BLEU value
	60000	80000	85000	90000
English-->German	9.09	10.98	12.53	11.78
German-->English	13.99	14.31	14.97	15.01
German-->French	17.13	18.76	18.22	18.65
French-->German	16.12	17.88	18.52	18.05
English-->French	11.76	11.67	12.59	12.56
French-->English	9.88	10.22	10.67	11.08