imputer.hpp

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#ifndef MLPACK_CORE_DATA_IMPUTER_HPP
#define MLPACK_CORE_DATA_IMPUTER_HPP

#include <mlpack/prereqs.hpp>
#include "dataset_mapper.hpp"
#include "map_policies/missing_policy.hpp"
#include "map_policies/increment_policy.hpp"

namespace mlpack {
namespace data {

template<typename T, typename MapperType, typename StrategyType>
class Imputer
{
 public:
  Imputer(MapperType mapper, bool columnMajor = true):
      mapper(std::move(mapper)),
      columnMajor(columnMajor)
  {
    // Nothing to initialize here.
  }

  Imputer(MapperType mapper, StrategyType strategy, bool columnMajor = true):
      strategy(std::move(strategy)),
      mapper(std::move(mapper)),
      columnMajor(columnMajor)
  {
    // Nothing to initialize here.
  }

  void Impute(arma::Mat<T>& input,
              const std::string& missingValue,
              const size_t dimension)
  {
    T mappedValue = static_cast<T>(mapper.UnmapValue(missingValue, dimension));
    strategy.Impute(input, mappedValue, dimension, columnMajor);
  }

  const StrategyType& Strategy() const { return strategy; }

  StrategyType& Strategy() { return strategy; }

  const MapperType& Mapper() const { return mapper; }

  MapperType& Mapper() { return mapper; }

 private:
  // StrategyType
  StrategyType strategy;

  // DatasetMapperType<MapPolicy>
  MapperType mapper;

  // save columnMajor as a member variable since it is rarely changed.
  bool columnMajor;

}; // class Imputer

} // namespace data
} // namespace mlpack

#endif