[mlpack-git] [mlpack/mlpack] Universal B tree implementation (#746)

[lozhnikov]

> +      size_t oldI = newToOld[i];
> +      size_t newIndex = newFromOld[index];
> +
> +      data.swap_cols(i, newFromOld[index]);
> +
> +      size_t tmp = newFromOld[index];
> +      newFromOld[index] = i;
> +      newFromOld[oldI] = tmp;
> +
> +      tmp = newToOld[i];
> +      newToOld[i] = newToOld[newIndex];
> +      newToOld[newIndex] = tmp;
> +
> +      tmp = oldFromNew[i];
> +      oldFromNew[i] = oldFromNew[newIndex];
> +      oldFromNew[newIndex] = tmp;

Yeah; First time I had used `oldFromNew` instead of `newToOld`. But then I had thought that the dataset can be rearranged before the tree construction (that never happens right now).

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