lcc.hpp

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#ifndef MLPACK_METHODS_LOCAL_COORDINATE_CODING_LCC_HPP
#define MLPACK_METHODS_LOCAL_COORDINATE_CODING_LCC_HPP

#include <mlpack/prereqs.hpp>
#include <mlpack/methods/lars/lars.hpp>

// Include three simple dictionary initializers from sparse coding.
#include "../sparse_coding/nothing_initializer.hpp"
#include "../sparse_coding/data_dependent_random_initializer.hpp"
#include "../sparse_coding/random_initializer.hpp"

namespace mlpack {
namespace lcc {

class LocalCoordinateCoding
{
 public:
  template<
      typename DictionaryInitializer =
          sparse_coding::DataDependentRandomInitializer
  >
  LocalCoordinateCoding(const arma::mat& data,
                        const size_t atoms,
                        const double lambda,
                        const size_t maxIterations = 0,
                        const double tolerance = 0.01,
                        const DictionaryInitializer& initializer =
                            DictionaryInitializer());

  LocalCoordinateCoding(const size_t atoms = 0,
                        const double lambda = 0.0,
                        const size_t maxIterations = 0,
                        const double tolerance = 0.01);

  template<
      typename DictionaryInitializer =
          sparse_coding::DataDependentRandomInitializer
  >
  double Train(const arma::mat& data,
               const DictionaryInitializer& initializer =
                   DictionaryInitializer());

  void Encode(const arma::mat& data, arma::mat& codes);

  void OptimizeDictionary(const arma::mat& data,
                          const arma::mat& codes,
                          const arma::uvec& adjacencies);

  double Objective(const arma::mat& data,
                   const arma::mat& codes,
                   const arma::uvec& adjacencies) const;

  size_t Atoms() const { return atoms; }
  size_t& Atoms() { return atoms; }

  const arma::mat& Dictionary() const { return dictionary; }
  arma::mat& Dictionary() { return dictionary; }

  double Lambda() const { return lambda; }
  double& Lambda() { return lambda; }

  size_t MaxIterations() const { return maxIterations; }
  size_t& MaxIterations() { return maxIterations; }

  double Tolerance() const { return tolerance; }
  double& Tolerance() { return tolerance; }

  template<typename Archive>
  void serialize(Archive& ar, const unsigned int /* version */);

 private:
  size_t atoms;

  arma::mat dictionary;

  double lambda;

  size_t maxIterations;
  double tolerance;
};

} // namespace lcc
} // namespace mlpack

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

#endif