before_sent:  The approach - tag-less back-translation - trains the model on the synthetic data and finetunes it on the natural data. Preliminary experiments have shown the approach to continuously outperform the tagging approach on low resource English-Vietnamese neural machine translation .
before_sent_with_intent: <clarity>  The approach - tag-less back-translation - trains the model on the synthetic data and finetunes it on the natural data. Preliminary experiments have shown the approach to continuously outperform the tagging approach on low resource English-Vietnamese neural machine translation .
after_sent:  The approach - tag-less back-translation - trains the model on the synthetic data and finetunes it on the authentic data. Experiments have shown the approach to continuously outperform the tagging approach on low resource English-Vietnamese neural machine translation .