DL	Deep learning
ML	Machine learning
NDE	Non-destructive evaluation
SHM	Structural health monitoring
Nd:YAG	Neodymium-doped Yttrium Aluminum Garnet
UWPI	Ultrasonic Wave Propagation Imaging
DCNN	Deep convolutional neural network
AE	Acoustic emission
kNN	k-nearest neighbors
SVR	Support vector machine
DNN	Deep neural network
Grad-CAM	Gradient-weight class activation mapping