Method FixHistogram

python-package/compile/src/io/dataset.cpp:993–1012

}

void Dataset::FixHistogram(int feature_idx, double sum_gradient, double sum_hessian, data_size_t num_data,
                           HistogramBinEntry* data) const {
  const int group = feature2group_[feature_idx];
  const int sub_feature = feature2subfeature_[feature_idx];
  const BinMapper* bin_mapper = feature_groups_[group]->bin_mappers_[sub_feature].get();
  const int default_bin = bin_mapper->GetDefaultBin();
  if (default_bin > 0) {
    const int num_bin = bin_mapper->num_bin();
    data[default_bin].sum_gradients = sum_gradient;
    data[default_bin].sum_hessians = sum_hessian;
    data[default_bin].cnt = num_data;
    for (int i = 0; i < num_bin; ++i) {
      if (i != default_bin) {
        data[default_bin].sum_gradients -= data[i].sum_gradients;
        data[default_bin].sum_hessians -= data[i].sum_hessians;
        data[default_bin].cnt -= data[i].cnt;
      }
    }
  }
}

template<typename T>
void PushVector(std::vector<T>* dest, const std::vector<T>& src) {