NIR	Near-infrared
BWO	Beluga whale optimization
DBWO	Discretized BWO
PLS	Partial least squares
RT	Randomization test
UVE	Uninformative variable elimination
MC-UVE	Monte Carlo uninformative variable elimination
ANN	Artificial neural network
PCR	Principal component regression
SVR	Support vector regression
GPR	Gaussian process regression
ELM	Extreme learning machine
SI	Swarm intelligence
LVs	Latent variables
RMSEP	Root mean square error of prediction
R2	Determination coefficients
KS	Kennard–Stone
RMSECV	Root mean square error of cross validation