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)
  {
    W = lowerBound + arma::randu<arma::Mat<eT>>(rows, cols) *
        (upperBound - lowerBound);
  }

  template<typename eT>
  void Initialize(arma::Cube<eT>& W,
                  const size_t rows,
                  const size_t cols,
                  const size_t slices)
  {
    W = arma::Cube<eT>(rows, cols, slices);

    for (size_t i = 0; i < slices; i++)
      Initialize(W.slice(i), rows, cols);
  }

 private:
  const double lowerBound;

  const double upperBound;
}; // class RandomInitialization

} // namespace ann
} // namespace mlpack

#endif