Table 3.

The performance of our ensemble model.

Method	BLEU-4	METEOR	ROUGE-L	CIDEr-D	SPICE
SCST [30]	35.4	27.1	56.6	117.5	-
RFNet [40]	37.9	28.3	58.3	125.7	21.7
Yan et al. [47]	38.4	27.8	57.9	121.6	21.5
Ours: PW	39.6	28.7	59.1	128.3	22.2
Ours: CW	39.8	28.8	59.4	128.3	22.2