Dual Learning: Theoretical Study and an Algorithmic Extension
Table 3: Accuracy of Translators Using Different Threshold BLEU.
['Threshold BLEU En↔De', 'Threshold BLEU  [ITALIC] p12', '10 0.65', '20 0.54']
Let S1 and S2 denote English and German respectively for the En↔De task (English and French respectively for the En↔Fr task). Values are percentages of translations that are above the threshold. Qualitatively, we observe that dual learning outcomes are better than standard transformers. More interesting observations lie in the following quantitative analysis on En↔De task.