Acronym	Definition	Acronym	Definition
ADMM	Alternating direction method of multipliers	KKT	Karush-Kuhn-Tucker
CDNSC	Correntropy-induced Discriminative nonnegative sparse coding	LAR	Least angle regression
CEE	Cooperative error estimator	LRC	Linear regression classifier
CESR	Correntropy-based sparse representation	LUMIRC	Laplacian-uniform mixture driven iterative robust coding
CIM	Correntropy-induced metric	MSE	Mean squared error
CMP	Correntropy matching pursuit	NMF	Nonnegative matrix factorization
CPSO	Constrained PSO	NMR	Nuclear norm-based matrix regression
CRC	Collaborative representation classifier	NNG	Nonnegative garrote
DNSR	Discriminative nonnegative sparse regularizer	PDF	Probability densities functions
DSRC	Discriminative SRC	RRC	Regularized robust coding
E-CDNSC	Extended CDNSC	RSC	Robust sparse coding
ECP	Equality constraint problem	RSRC	robust SRC
GNMF	Graph regularized nonnegative matrix factorization	SRC	Sparse representation classifier
HQ	Half-quadratic	SSRC	Superposed SRC
ICP	Inequality constraint problem	TPNMF	Topology-preserving nonnegative matrix factorization