Class BinMapper

include/LightGBM/bin.h:65–214

! \brief This class used to convert feature values into bin, * and store some meta information for bin*/

/*! \brief This class used to convert feature values into bin,
*          and store some meta information for bin*/
class BinMapper {
 public:
  BinMapper();
  BinMapper(const BinMapper& other);
  explicit BinMapper(const void* memory);
  ~BinMapper();

  bool CheckAlign(const BinMapper& other) const {
    if (num_bin_ != other.num_bin_) {
      return false;
    }
    if (missing_type_ != other.missing_type_) {
      return false;
    }
    if (bin_type_ == BinType::NumericalBin) {
      for (int i = 0; i < num_bin_; ++i) {
        if (bin_upper_bound_[i] != other.bin_upper_bound_[i]) {
          return false;
        }
      }
    } else {
      for (int i = 0; i < num_bin_; i++) {
        if (bin_2_categorical_[i] != other.bin_2_categorical_[i]) {
          return false;
        }
      }
    }
    return true;
  }

  /*! \brief Get number of bins */
  inline int num_bin() const { return num_bin_; }
  /*! \brief Missing Type */
  inline MissingType missing_type() const { return missing_type_; }
  /*! \brief True if bin is trivial (contains only one bin) */
  inline bool is_trivial() const { return is_trivial_; }
  /*! \brief Sparsity of this bin ( num_zero_bins / num_data ) */
  inline double sparse_rate() const { return sparse_rate_; }
  /*!
  * \brief Save binary data to file
  * \param file File want to write
  */
  void SaveBinaryToFile(const VirtualFileWriter* writer) const;
  /*!
  * \brief Mapping bin into feature value
  * \param bin
  * \return Feature value of this bin
  */
  inline double BinToValue(uint32_t bin) const {
    if (bin_type_ == BinType::NumericalBin) {
      return bin_upper_bound_[bin];
    } else {
      return bin_2_categorical_[bin];
    }
  }
  /*!
  * \brief Get sizes in byte of this object
  */