[mlpack-git] [mlpack/mlpack] Random projection trees (#726)

[lozhnikov]

> +  RPTreeMeanSplit<BoundType, MatType>::GetRandomDirection(
> +      splitInfo.direction);
> +
> +  // Get the value according to which we will perform the split.
> +  if (!GetSplitVal(data, begin, count, splitInfo.direction, splitInfo.splitVal))
> +    return false;
> +
> +  return true;
> +}
> +
> +template<typename BoundType, typename MatType>
> +typename MatType::elem_type RPTreeMaxSplit<BoundType, MatType>::
> +GetRandomDeviation(const MatType& data,
> +                   const size_t begin,
> +                   const size_t count,
> +                   const arma::Col<ElemType>& direction)

Yeah, I substituted that by 
`math::Random((minimum - splitVal) * 0.75, + (maximum - splitVal) * 0.75);`
since I am not sure that the original algorithm guarantees that both children will not be empty.

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