all_categorical_split.hpp

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#ifndef MLPACK_METHODS_DECISION_TREE_ALL_CATEGORICAL_SPLIT_HPP
#define MLPACK_METHODS_DECISION_TREE_ALL_CATEGORICAL_SPLIT_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace tree {

template<typename FitnessFunction>
class AllCategoricalSplit
{
 public:
  // No extra info needed for split.
  class AuxiliarySplitInfo { };

  template<bool UseWeights, typename VecType, typename LabelsType,
           typename WeightVecType>
  static double SplitIfBetter(
      const double bestGain,
      const VecType& data,
      const size_t numCategories,
      const LabelsType& labels,
      const size_t numClasses,
      const WeightVecType& weights,
      const size_t minimumLeafSize,
      const double minimumGainSplit,
      arma::vec& splitInfo,
      AuxiliarySplitInfo& aux);

  template<bool UseWeights, typename VecType, typename ResponsesType,
           typename WeightVecType>
  static double SplitIfBetter(
      const double bestGain,
      const VecType& data,
      const size_t numCategories,
      const ResponsesType& responses,
      const WeightVecType& weights,
      const size_t minimumLeafSize,
      const double minimumGainSplit,
      double& splitInfo,
      AuxiliarySplitInfo& aux,
      FitnessFunction& fitnessFunction);

  static size_t NumChildren(const double& splitInfo,
                            const AuxiliarySplitInfo& /* aux */);

  template<typename ElemType>
  static size_t CalculateDirection(
      const ElemType& point,
      const double& splitInfo,
      const AuxiliarySplitInfo& /* aux */);
};

} // namespace tree
} // namespace mlpack

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

#endif