As the number of real in-domain sentences increases, the BLEU scores on the in-domain test set improve, and finetuning on both the pseudo and real in-domain sentences further improves over fine-tuning sorely on the real in-domain sentences.
given a reasonable number of real in-domain sentences in a common semi-supervised adaptation setting, DALI is still helpful in leveraging a large number of monolingual in-domain sentences.