numeric_split_info.hpp

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#ifndef MLPACK_METHODS_HOEFFDING_TREES_NUMERIC_SPLIT_INFO_HPP
#define MLPACK_METHODS_HOEFFDING_TREES_NUMERIC_SPLIT_INFO_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace tree {

template<typename ObservationType = double>
class NumericSplitInfo
{
 public:
  NumericSplitInfo() { /* Nothing to do. */ }
  NumericSplitInfo(const arma::Col<ObservationType>& splitPoints) :
      splitPoints(splitPoints) { /* Nothing to do. */ }

  template<typename eT>
  size_t CalculateDirection(const eT& value) const
  {
    // What bin does the point fall into?
    size_t bin = 0;
    while (bin < splitPoints.n_elem && value > splitPoints[bin])
      ++bin;

    return bin;
  }

  template<typename Archive>
  void serialize(Archive& ar, const uint32_t /* version */)
  {
    ar(CEREAL_NVP(splitPoints));
  }

 private:
  arma::Col<ObservationType> splitPoints;
};

} // namespace tree
} // namespace mlpack

#endif