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

[Ryan Curtin]

Personally I think that we should avoid supporting Cubes, and have users represent their data always as an arma::Mat object.  If they want they can actually represent their data in their program as a Cube, but when they use mlpack they should represent it as a Mat.  This is pretty easy actually:

```
arma::Cube cube; // this is filled with data, each slice is a point
arma::Mat matrixRepresentation(cube.memptr(), cube.n_slices, cube.n_rows * cube.n_cols, false); // don't copy memory; this is an alias
```

Maybe there is some nicer Armadillo function to do that; I didn't look.

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Reply to this email directly or view it on GitHub:
https://github.com/mlpack/mlpack/pull/523#issuecomment-191843403
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