random_init.hpp

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#ifndef MLPACK_METHODS_ANN_INIT_RULES_RANDOM_INIT_HPP
#define MLPACK_METHODS_ANN_INIT_RULES_RANDOM_INIT_HPP
 
#include <mlpack/prereqs.hpp>
 
namespace mlpack {
namespace ann  {
 
class RandomInitialization
{
 public:
  RandomInitialization(const double lowerBound = -1,
                       const double upperBound = 1) :
      lowerBound(lowerBound), upperBound(upperBound) { }
 
  RandomInitialization(const double bound) :
      lowerBound(-std::abs(bound)), upperBound(std::abs(bound)) { }
 
  template<typename eT>
  void Initialize(arma::Mat<eT>& W, const size_t rows, const size_t cols)
  {
    if (W.is_empty())
      W.set_size(rows, cols);
 
    W.randu();
    W *= (upperBound - lowerBound);
    W += lowerBound;
  }
 
  template<typename eT>
  void Initialize(arma::Mat<eT>& W)
  {
    if (W.is_empty())
      Log::Fatal << "Cannot initialize an empty matrix." << std::endl;
 
    W.randu();
    W *= (upperBound - lowerBound);
    W += lowerBound;
  }
 
  template<typename eT>
  void Initialize(arma::Cube<eT>& W,
                  const size_t rows,
                  const size_t cols,
                  const size_t slices)
  {
    if (W.is_empty())
      W.set_size(rows, cols, slices);
 
    for (size_t i = 0; i < slices; ++i)
      Initialize(W.slice(i), rows, cols);
  }
 
  template<typename eT>
  void Initialize(arma::Cube<eT>& W)
  {
    if (W.is_empty())
      Log::Fatal << "Cannot initialize an empty cube." << std::endl;
 
    for (size_t i = 0; i < W.n_slices; ++i)
      Initialize(W.slice(i));
  }
 
 private:
  double lowerBound;
 
  double upperBound;
}; // class RandomInitialization
 
} // namespace ann
} // namespace mlpack
 
#endif