Table 2.

Descriptions of the relevant six datasets used in this paper.

Item	Dataset
	COIL20	GEORGIA	MNIST	ORL	PIE	USPS
Sample	1,440	750	1,000	400	1,166	1,000
Size	$32\times 32$	$32\times 32$	$28\times 28$	$112\times 92$	$32\times 32$	$16\times 16$
Category	20	50	10	40	53	10