CD	contrastive divergence
FFT	fast Fourier transform
ISOMAP	isometric mapping
KL	Kullback–Leibler
LDA	linear discriminant analysis
MCGS	mean-centered group scaling
NN	neural network
PCA	principal component analysis
PPV	positive predictive value
P-t-SNE	parametric t-distributed stochastic neighbor embedding
PZT	piezoelectric transducers
RBM	restricted Boltzmann machine
SHM	structural health monitoring
TNR	true negative rate
TPR	true positive rate
t-SNE	t-distributed stochastic neighbor embedding