random_partition.hpp

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#ifndef MLPACK_METHODS_KMEANS_RANDOM_PARTITION_HPP
#define MLPACK_METHODS_KMEANS_RANDOM_PARTITION_HPP

#include <mlpack/prereqs.hpp>

namespace mlpack {
namespace kmeans {

class RandomPartition
{
 public:
  RandomPartition() { }

  template<typename MatType>
  inline static void Cluster(const MatType& data,
                             const size_t clusters,
                             arma::Row<size_t>& assignments)
  {
    // Implementation is so simple we'll put it here in the header file.
    assignments = arma::shuffle(arma::linspace<arma::Row<size_t>>(0,
        (clusters - 1), data.n_cols));
  }

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

} // namespace kmeans
} // namespace mlpack

#endif