An Improved Sign Language Translation Model with Explainable Adaptations for Processing Long Sign Sentences

Table 3

BLEU scores on DH-BiGRU unit in different levels.

#	Levels	Development set					Test set
		ROUGE	BLEU-1	BLEU-2	BLEU-3	BLEU-4	ROUGE	BLEU-1	BLEU-2	BLEU-3	BLEU-4
3a	1	31.34	30.94	18.26	12.71	9.76	32.18	31.60	18.52	12.43	9.52
3b	2	31.69	31.23	18.62	13.15	10.16	32.08	30.08	18.15	12.88	9.97
3c	3	33.02	32.37	19.49	13.44	10.21	32.25	32.19	19.38	13.71	10.66
3d	4	31.52	31.40	18.71	13.00	9.87	31.58	31.85	18.95	13.17	10.03