Before revision:  We explored using only the target-side monolingual data to improve the backward model through forward translation and the forward model through back-translation. Experimental results on English-German and  English-Vietnamese low resource neural machine translation showed that the proposed approach outperforms baselines that use the traditional back-translation method .
After revision:  We explored using only the target-side monolingual data to improve the model itself through the forward translation technique. The technique was shown to improve baseline low resource IWSLT'14 English-German and English-Vietnamese low resource neural machine translation showed that the proposed approach outperforms baselines that use the traditional back-translation method .