BLEU is the metric that is seen more commonly in image description literature, but a more recent study (Elliott and Keller, 2014) has shown METEOR to be a better evaluation metric.
since both metrics have been shown to correlate well with human eval-Model S% V% O% HVC (Thomason et al., 2014) 86.87 38.66 22.09 FGM (Thomason et al., 2014) 88  Table 1: SVO accuracy: Binary SVO accuracy compared against any valid S,V,O triples in the ground truth descriptions.