Table 2.

The image captioning results of our method and others on the MSCOCO Karpathy test split after CIDEr-D score optimization.

Method	BLEU-1	BLEU-2	BLEU-3	BLEU-4	METEOR	ROUGE-L	CIDEr-D	SPICE
LSTM [20]	-	-	-	31.9	25.5	54.3	106.3	-
SCST [30]	-	-	-	34.2	26.7	55.7	114.0	-
RFNet [40]	79.1	63.1	48.4	36.5	27.7	57.3	121.9	21.2
UpDown [22]	79.8	-	-	36.3	27.7	56.9	120.1	21.4
Cai et al. [42]	80.0	64.3	49.6	37.5	28.2	58.2	126.0	21.8
UpDown+RD [43]	80.0	-	-	37.8	28.2	57.9	125.3	-
UpDown+STAM [41]	80.2	64.4	49.7	37.7	28.2	58.1	125.9	21.7
UpDown+LAT [44]	80.4	-	-	37.7	28.4	58.3	127.1	22.0
VRAtt-Soft [45]	80.2	63.3	48.7	37.3	28.4	61.4	121.8	21.8
UpDown+MA [46]	80.2	-	-	37.5	28.4	58.2	125.4	22.0
Ours: PW	80.4	65.1	50.8	39.1	28.7	58.7	127.6	22.2
Ours: CW	80.6	65.2	50.9	39.1	28.7	58.8	127.2	22.1