Before revision:  This compositional nature of captioning exhibits the potential of unpaired image captioning, thereby reducing the dependence on expensive image-caption pairs. Furthermore, we investigate the use of skeletons as a knob to control certain properties of the generated image caption , such as length, content, and gender expression  .
After revision:  We also show that skeleton-based prediction allows for better control of certain caption properties , such as length, content, and gender expression .