adaboost_model.hpp

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#ifndef MLPACK_METHODS_ADABOOST_ADABOOST_MODEL_HPP
#define MLPACK_METHODS_ADABOOST_ADABOOST_MODEL_HPP

#include <mlpack/core.hpp>

// Use forward declaration instead of include to accelerate compilation.
class AdaBoost;

namespace mlpack {
namespace adaboost {

class AdaBoostModel
{
 public:
  enum WeakLearnerTypes
  {
    DECISION_STUMP,
    PERCEPTRON
  };

 private:
  arma::Col<size_t> mappings;
  size_t weakLearnerType;
  AdaBoost<decision_stump::DecisionStump<>>* dsBoost;
  AdaBoost<perceptron::Perceptron<>>* pBoost;
  size_t dimensionality;

 public:
  AdaBoostModel();

  AdaBoostModel(const arma::Col<size_t>& mappings,
                const size_t weakLearnerType);

  AdaBoostModel(const AdaBoostModel& other);

  AdaBoostModel(AdaBoostModel&& other);

  AdaBoostModel& operator=(const AdaBoostModel& other);

  ~AdaBoostModel();

  const arma::Col<size_t>& Mappings() const { return mappings; }
  arma::Col<size_t>& Mappings() { return mappings; }

  size_t WeakLearnerType() const { return weakLearnerType; }
  size_t& WeakLearnerType() { return weakLearnerType; }

  size_t Dimensionality() const { return dimensionality; }
  size_t& Dimensionality() { return dimensionality; }

  void Train(const arma::mat& data,
             const arma::Row<size_t>& labels,
             const size_t numClasses,
             const size_t iterations,
             const double tolerance);

  void Classify(const arma::mat& testData, arma::Row<size_t>& predictions);

  template<typename Archive>
  void serialize(Archive& ar, const unsigned int /* version */)
  {
    if (Archive::is_loading::value)
    {
      if (dsBoost)
        delete dsBoost;
      if (pBoost)
        delete pBoost;

      dsBoost = NULL;
      pBoost = NULL;
    }

    ar & BOOST_SERIALIZATION_NVP(mappings);
    ar & BOOST_SERIALIZATION_NVP(weakLearnerType);
    if (weakLearnerType == WeakLearnerTypes::DECISION_STUMP)
      ar & BOOST_SERIALIZATION_NVP(dsBoost);
    else if (weakLearnerType == WeakLearnerTypes::PERCEPTRON)
      ar & BOOST_SERIALIZATION_NVP(pBoost);
    ar & BOOST_SERIALIZATION_NVP(dimensionality);
  }
};

} // namespace adaboost
} // namespace mlpack

#endif