Our task is related to caption generation, which has been studied extensively (e.g., Pedersoli et al., 2016;Carrara et al., 2016;Chen et al., 2016) with MSCOCO (Chen et al., 2015b) and Flickr30K (Young et al., 2014;Plummer et al., 2015).
to caption generation, our task does not require approximate metrics like BLEU.