network, train, backprop_evaluate, MLP_net, backpropagation_MLP,
logistic, ReLU, smoothReLU, ident, softmax, Qloss, multinomial,
NNgrad_test, weights2list, bias2list, biasInit, memInit, gradInit,
addGrad, nnetpar, nbiaspar, addList, no_regularisation, L1_regularisation,
L2_regularisation