AI	Artificial intelligence
ANN	Artificial neural networks
AU	Action units
CNN	Convolutional neural network
CCC	Concordance correlation coefficient
DNN	Deep neural network
EEG	Electroencephalogram
FC	Fully connected
FER	Facial emotion recognition
GAN	Generative adversarial networks
GNN	Graph neural network
HOG	Histogram of oriented gradients
IoT	Internet of things
KNN	K-nearest neighbors
LFA	Local feature analysis
LDA	Linear discriminant analysis
LBP	Local binary pattern
LSTM	Long short-term memory
MLP	Multi-layer perceptron
NLP	Natural language processing
PRISMA-ScR	Systematic Reviews and Meta-Analyses extension for Scoping Reviews
PCA	Principal component analysis
RNN	Recurrent neural network
ResNet	Residual neural network
SVM	Support vector machine
VGG	Visual geometry group