NNbigdatasets is a list with the big datasets presented in this package and the
recommended number of hidden neurons for each neural network model.
Each item of the list is itself a list with 5 components:
ds: character. The name of the dataset.
neur: integer. The recommanded number of hidden neurons in the NN model and in
fmlaNN.
nparNN: integer. The number of parameters in fmlaNN.
fmlaNN: the formula of the corresponding neural network, with tanh() as the
activation function in the hidden layer.
Z: matrix or data.frame. The dataset itself.
Using attach() and detach() gives a direct access to these items.