[mlpack-git] [mlpack] add train test split (#523)

[stereomatchingkiss]

>Do you mean that it's essential internally for the ANN code, or that the user should pass in their data as an arma::Cube?

I think both? At least for cnn, it would be easier to deal with the images if we can treat the cube as the container of  images(with n channels). Exactly, it do not need to be cube, it could be std::vector, we just need a container to store those images, but using arma cube may fit mlpack better.

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