Table 1.

Categories and parameter settings of involved algorithms.

Algorithms	Categories	Parameter values or trial ranges
FCM	Soft-partition clustering	Fuzzifier m ∈ [1.1 : 0.1 : 2.5]
MEC	Soft-partition clustering	Entropy regularization parameter β ∈[0.05:0.05:1, 10:10:100]
PCM	Soft-partition clustering	Fuzzifier m ∈[1.1 : 0.1 : 2:5]
		Parameter K=1
ECM	Soft-partition clustering	Parameter α ∈[1:1:10]
		Parameter β ∈[1.1:0.1:2.5]
		Parameter δ ∈[3:1:9]
FC-QR	Soft-partition clustering	Quadratic function regularizing coefficient γ ∈[0.1:0.1:2, 20:20:200]
QWGSD-FC	Soft-partition clustering	Diversity measure coefficient β ∈[0.05:0.05:1, 10:10:100]
LSSMTC	Hard-partition clustering; Multi-task clustering;	Task number T=2
		Regularization parameter l ∈{2; 22; 23; 24 ∪ [100 : 100 : 1000]
		Regularization parameter λ ∈{0.25, 0.5, 0.75}
ComKM	Hard-partition clustering; Multi-task clustering	K equals the number of cluster
STC	Transfer clustering; Co-clustering	Trade-off parameter λ = 1
TSC	Transfer clustering; Multi-task clustering; Co-clustering	Parameters K=27, λ = 3, and step=1
TI-KT-CM	Soft-partition clustering; Transfer clustering	Entropy regularization parameter β∈[0.05:0.05:1,10:10:100]
		Transfer regularization parameter γ∈[0:0.05:1,2:1:10,20:10:200]
TII-KT-CM	Soft-partition clustering; Transfer clustering	Entropy regularization parameter β∈[0.05:0.05:1,10:10:100]
		Transfer regularization parameter γ∈[0:0.05:1,2:1:10,20:10:200]
		Transfer trade-off factor η∈=[0 : 0:05 : 1]