 To solve this issue , a novel metric of distributional discrepancy (DD) is designed to evaluate generators according to the discrepancy between the generated sentences and the real training sentences.
<clarity>  To solve this issue , a novel metric of distributional discrepancy (DD) is designed to evaluate generators according to the discrepancy between the generated sentences and the real training sentences.
 To solve this issue , a novel metric of distributional discrepancy (DD) is designed to evaluate generators based on the discrepancy between the generated sentences and the real training sentences.