nmf_mult_dist.hpp

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#ifndef MLPACK_METHODS_LMF_UPDATE_RULES_NMF_MULT_DIST_UPDATE_RULES_HPP
#define MLPACK_METHODS_LMF_UPDATE_RULES_NMF_MULT_DIST_UPDATE_RULES_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace amf {

class NMFMultiplicativeDistanceUpdate
{
 public:
  // Empty constructor required for the UpdateRule template.
  NMFMultiplicativeDistanceUpdate() { }

  template<typename MatType>
  void Initialize(const MatType& /* dataset */, const size_t /* rank */)
  {
    // Nothing to do.
  }

  template<typename MatType>
  inline static void WUpdate(const MatType& V,
                             arma::mat& W,
                             const arma::mat& H)
  {
    W = (W % (V * H.t())) / (W * H * H.t());
  }

  template<typename MatType>
  inline static void HUpdate(const MatType& V,
                             const arma::mat& W,
                             arma::mat& H)
  {
    H = (H % (W.t() * V)) / (W.t() * W * H);
  }

  template<typename Archive>
  void serialize(Archive& /* ar */, const uint32_t /* version */) { }
};

} // namespace amf
} // namespace mlpack

#endif