FER	Facial Expression Recognition
JAFFE	Japanese Female Facial Expression
TFEID	Taiwanese Facial Expression Image Database
PF07	POSTECH Face Database
NVIE	Natural Visible and Infrared Facial Expression Database
CAFPS	Chinese Affective Face Picture System
KTFE	Kotani Thermal Facial Emotion
KUFEC-II	Korea University Facial Expression Collection-Second Edition
TFEES	Taiwanese Facial Emotional Expression Stimuli
KRC	Kokoro Research Center Facial Expression Database
Tsinghua FED	Tsinghua Facial Expression Database
MMEW	Micro-and-macro Expression Warehouse
AFE	Asian Face Expression
MTCNN	Multi-task Convolutional Neural Network
LBP	Local Binary Pattern
LDP	Local Derivative Pattern
WPLBP	Weighted-projection-based LBP
HOG	Histogram of Oriented Gradient
PHOG	Pyramid Histogram of Oriented Gradients
PCA	Principal Component Analysis
SWLDA	Stepwise Linear Discriminant Analysis
LCT	Local Curvelet Transform
CNN	Convolutional Neural Network
DBN	Deep Belief Network
DAE	Deep Autoencoder
GAN	Generative Adversarial Network
SVM	Support Vector Machines
KNN	K-Nearest Neighbors
NB	Naive Bayes
RF	Random Forest
MLP	Multilayer Perceptron
AU	Action Unit
FACS	Facial Action Coding System
AHash	Average Hash
PHash	Perceptual Hash
DHash	Difference Hash
EAFE	East Asian Facial Expression
LR	Learning Rate
ExponentialLR	Exponential LR Schedule
StepLR	Step Decay LR schedule
MultiStepLR	MultiStep Decay LR schedule
CosineLR	Cosine LR schedule
PiecewiseLR	Piecewise Constant Decay LR schedule