nntools : train, validation, test

I am currently using nntools. I have 10,000 data with multiful input and single output. If I use a command "nntools" which I believe this is just for training. If so, how come the regression plots have training, validation, test, and all plots? I am confusing.

[John D'Errico]

I think you need to start reading the tutorials for the neural net toolbox. They did put the documentation there for a good reason.