random_initializer.hpp

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#ifndef MLPACK_METHODS_SPARSE_CODING_RANDOM_INITIALIZER_HPP
#define MLPACK_METHODS_SPARSE_CODING_RANDOM_INITIALIZER_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace sparse_coding {

class RandomInitializer
{
 public:
  static void Initialize(const arma::mat& data,
                         const size_t atoms,
                         arma::mat& dictionary)
  {
    // Create random dictionary.
    dictionary.randn(data.n_rows, atoms);

    // Normalize each atom.
    for (size_t j = 0; j < atoms; ++j)
      dictionary.col(j) /= norm(dictionary.col(j), 2);
  }
};

} // namespace sparse_coding
} // namespace mlpack

#endif