Table 8.

Mean size of selected feature subsets

Datasets	Algorithms
	PSO	WOA	GOA	BPSO	BWOA	BGOA	NL-BGWOA
D1	137.6	143.0	128.1	140.0	134.3	173.9	108.3
D2	14.7	13.5	12.8	14.8	10.2	10.9	5.6
D3	104.9	86.8	78.7	82.1	64.9	86.6	35.8
D4	109.4	78	79.7	84.6	68.3	71.5	43.0
D5	19.7	22.1	17.3	18.3	20.5	15.8	11.9
D6	51.3	48.5	47.9	46.0	39.6	55.0	22.3
D7	14.7	13.6	15.4	15.0	5.1	13.1	3.2
D8	37.6	28.6	29.1	27.6	14.5	27.4	7.4
D9	29.9	31.2	27	29.9	24.9	29.5	16.4
D10	35.8	32.5	17.7	22.7	11.0	21.7	9.1