NLSE	non-linear least squares estimation
GP	Gaussian process
ALS	approximated NLSE
ARSS	approximated residual sum of squares
E-data	real experimental data
C-data	computer data
B-data	both of E-data and C-data
MLE	maximum likelihood estimation
FMLE	full MLE
SMLE	separated MLE
EM	expectation and maximization
E-step	expectation step
M-step	maximization step
pdf	probability density function
Max-min	maximization and minimization algorithm
KOH	Kenney-O’Hagan method
RMSE	root mean squared error