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

[stereomatchingkiss]

>We can't just shuffle the dataset (data) because one set of the has 3 slices.

It can be done, but need some change.First part is the ExtractData

 ```
 template<typename T>
  void ExtractData(arma::Cube<T> const &input, arma::Cube<T> &output,
                   size_t inputIndex, size_t outputIndex) const
  {
    outputIndex *= slice;
    inputIndex *= slice;
    output.slices(outputIndex, outputIndex + slice - 1) =
        input.slices(inputIndex, inputIndex + slice - 1);
  }
```

Second part is augmentation the order of col(if you take solution 2)

```
arma::Col<size_t> augmentOrder(order.size()*slice);
for(size_t i = 0; i != order.size(); ++i){
    for(size_t j = 0; j != slice; ++j){
       augmentOrder(i*slice + j) = order(i);
    }
}
```

>Actually I have a preference for solution 1
Then I would take the path of solution 1, this one could save some memory and maybe more intuitive for users.

---
Reply to this email directly or view it on GitHub:
https://github.com/mlpack/mlpack/pull/523#issuecomment-189751957
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