CNN	Convolutional Neural Network
DACN	Dynamic Attention Convolutional Network
DNN	Deep Neural Networks
EER	Equal Error Rate
FACN	Frame Attention Convolutional Network
Grad-CAM	Gradient-weighted Class Activation Mapping
HTER	Half Total Error Rates
LBP	Linear Binary Pattern
LSTM	Long Short Term Memory
ML	Machine Learning
NLP	Natural Language Processing
PAD	Presentation Attack Detection
PAI	Presentation Attack Instruments
ReLU	Rectified Linear Unit
RNN	Recurrent Neural Network
SGD	Stochastic Gradient Descent
XAI	Explainable Artificial Intelligence
X-PAD	Explainable PAD