diagonal_constraint.hpp

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#ifndef MLPACK_METHODS_GMM_DIAGONAL_CONSTRAINT_HPP
#define MLPACK_METHODS_GMM_DIAGONAL_CONSTRAINT_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace gmm {

class DiagonalConstraint
{
 public:
  static void ApplyConstraint(arma::mat& covariance)
  {
    // Save the diagonal only.
    arma::vec diagonal = covariance.diag();
    covariance = arma::diagmat(diagonal);
  }

  template<typename Archive>
  static void Serialize(Archive& /* ar */, const unsigned int /* version */) { }
};

} // namespace gmm
} // namespace mlpack

#endif