LR	Linear regression model
$\nu$-SVR	$\nu$-Support vector regression
GN-SVR	$\nu$-SVR model of Gaussian homoscedastic-noise
LSSVR	Least squares support vector regression model
GLM-LSSVR	LSSVR model of Gaussian–Laplacian mixed homoscedastic-noise
ALM	Augmented Lagrange multiplier method