hollow_ball_bound.hpp

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#ifndef MLPACK_CORE_TREE_HOLLOW_BALL_BOUND_HPP
#define MLPACK_CORE_TREE_HOLLOW_BALL_BOUND_HPP

#include <mlpack/prereqs.hpp>
#include <mlpack/core/metrics/lmetric.hpp>
#include "bound_traits.hpp"

namespace mlpack {
namespace bound {

template<typename TMetricType = metric::LMetric<2, true>,
         typename ElemType = double>
class HollowBallBound
{
 public:
  typedef TMetricType MetricType;

 private:
  math::RangeType<ElemType> radii;
  arma::Col<ElemType> center;
  arma::Col<ElemType> hollowCenter;
  MetricType* metric;

  bool ownsMetric;

 public:

  HollowBallBound();

  HollowBallBound(const size_t dimension);

  template<typename VecType>
  HollowBallBound(const ElemType innerRadius,
                  const ElemType outerRadius,
                  const VecType& center);

  HollowBallBound(const HollowBallBound& other);

  HollowBallBound& operator=(const HollowBallBound& other);

  HollowBallBound(HollowBallBound&& other);

  ~HollowBallBound();

  ElemType OuterRadius() const { return radii.Hi(); }
  ElemType& OuterRadius() { return radii.Hi(); }

  ElemType InnerRadius() const { return radii.Lo(); }
  ElemType& InnerRadius() { return radii.Lo(); }

  const arma::Col<ElemType>& Center() const { return center; }
  arma::Col<ElemType>& Center() { return center; }

  const arma::Col<ElemType>& HollowCenter() const { return hollowCenter; }
  arma::Col<ElemType>& HollowCenter() { return hollowCenter; }

  size_t Dim() const { return center.n_elem; }

  ElemType MinWidth() const { return radii.Hi() * 2.0; }

  math::RangeType<ElemType> operator[](const size_t i) const;

  template<typename VecType>
  bool Contains(const VecType& point) const;

  bool Contains(const HollowBallBound& other) const;

  template<typename VecType>
  void Center(VecType& center) const { center = this->center; }

  template<typename VecType>
  ElemType MinDistance(const VecType& point,
                       typename std::enable_if_t<IsVector<VecType>::value>* = 0)
      const;

  ElemType MinDistance(const HollowBallBound& other) const;

  template<typename VecType>
  ElemType MaxDistance(const VecType& point,
                       typename std::enable_if_t<IsVector<VecType>::value>* = 0)
      const;

  ElemType MaxDistance(const HollowBallBound& other) const;

  template<typename VecType>
  math::RangeType<ElemType> RangeDistance(
      const VecType& other,
      typename std::enable_if_t<IsVector<VecType>::value>* = 0) const;

  math::RangeType<ElemType> RangeDistance(const HollowBallBound& other) const;

  template<typename MatType>
  const HollowBallBound& operator|=(const MatType& data);

  const HollowBallBound& operator|=(const HollowBallBound& other);

  ElemType Diameter() const { return 2 * radii.Hi(); }

  const MetricType& Metric() const { return *metric; }
  MetricType& Metric() { return *metric; }

  template<typename Archive>
  void Serialize(Archive& ar, const unsigned int version);
};

template<typename MetricType, typename ElemType>
struct BoundTraits<HollowBallBound<MetricType, ElemType>>
{
  const static bool HasTightBounds = false;
};

} // namespace bound
} // namespace mlpack

#include "hollow_ball_bound_impl.hpp"

#endif // MLPACK_CORE_TREE_HOLLOW_BALL_BOUND_HPP