PDR	Pedestrian Dead Reckon
MEMS	Micro-electromechanical System Sensor
RNN	Recurrent Neural Network
CNN	Convolutional Neural Network
kNN	k-Nearest Neighbor
SGD	Stochastic Gradient Descent
SVM	Support Vector Machine
RF	Random Forest
NN	Neural Network
ANN	Artificial Neural Network
DCNN	Deep Convolutional Neural Network
DBN	Deep Belief Network
MLP	Multi-Layer Perceptron
ML	Machine Learning
GNSS	Global Navigation Satellite System
DT	Decision Tree
LSTM	Long Short-Term Memory
IOT	Internet of Things