midpoint_split.hpp

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#ifndef MLPACK_CORE_TREE_BINARY_SPACE_TREE_MIDPOINT_SPLIT_HPP
#define MLPACK_CORE_TREE_BINARY_SPACE_TREE_MIDPOINT_SPLIT_HPP

#include <mlpack/prereqs.hpp>
#include <mlpack/core/tree/perform_split.hpp>

namespace mlpack {
namespace tree  {

template<typename BoundType, typename MatType = arma::mat>
class MidpointSplit
{
 public:
  struct SplitInfo
  {
    size_t splitDimension;
    double splitVal;
  };
  static bool SplitNode(const BoundType& bound,
                        MatType& data,
                        const size_t begin,
                        const size_t count,
                        SplitInfo& splitInfo);

  static size_t PerformSplit(MatType& data,
                             const size_t begin,
                             const size_t count,
                             const SplitInfo& splitInfo)
  {
    return split::PerformSplit<MatType, MidpointSplit>(data, begin, count,
        splitInfo);
  }

  static size_t PerformSplit(MatType& data,
                             const size_t begin,
                             const size_t count,
                             const SplitInfo& splitInfo,
                             std::vector<size_t>& oldFromNew)
  {
    return split::PerformSplit<MatType, MidpointSplit>(data, begin, count,
        splitInfo, oldFromNew);
  }

  template<typename VecType>
  static bool AssignToLeftNode(const VecType& point,
                               const SplitInfo& splitInfo)
  {
    return point[splitInfo.splitDimension] < splitInfo.splitVal;
  }
};

} // namespace tree
} // namespace mlpack

// Include implementation.
#include "midpoint_split_impl.hpp"

#endif