Exemplars aim to provide appropriate context. To better understand the context, we experimented by analysing the questions generated through an exemplar. We observed that indeed a supporting exemplar could identify relevant tags (cows in Figure FIGREF3 ) for generating questions.

We improve use of exemplars by using a triplet network. This network ensures that the joint image-caption embedding for the supporting exemplar are closer to that of the target image-caption and vice-versa. 
 Question: How do the authors define exemplars?
Exemplars aim to provide appropriate context. joint image-caption embedding for the supporting exemplar are closer to that of the target image-caption