SCN	Stochastic Configuration Network
SLFNNs	Single-layer Feed-forward Neural Networks
RBF	Randomized Radial Basis Function (RBF) Networks
RVFL	Random Vector Functional-link
NN	Neural Networks
RW-FNN	Feed-forward Networks with Random Weights
RMSE	Root Mean Square Error
MNIST	Modified National Institute of Standards and Technology database