 Since, goal-oriented dialogs naturally exhibit a hierarchical structure over utterances and related annotations, deep generative data augmentation for the task requires the generative model to be aware of the hierarchical nature .
<clarity>  Since, goal-oriented dialogs naturally exhibit a hierarchical structure over utterances and related annotations, deep generative data augmentation for the task requires the generative model to be aware of the hierarchical nature .
 Since, goal-oriented dialogs over utterances and related annotations, deep generative data augmentation for the task requires the generative model to be aware of the hierarchical nature .