Method FinishLoad

src/io/sparse_bin.hpp:243–264

  OrderedBin* CreateOrderedBin() const override;

  void FinishLoad() override {
    // get total non zero size
    size_t pair_cnt = 0;
    for (size_t i = 0; i < push_buffers_.size(); ++i) {
      pair_cnt += push_buffers_[i].size();
    }
    std::vector<std::pair<data_size_t, VAL_T>>& idx_val_pairs = push_buffers_[0];
    idx_val_pairs.reserve(pair_cnt);

    for (size_t i = 1; i < push_buffers_.size(); ++i) {
      idx_val_pairs.insert(idx_val_pairs.end(), push_buffers_[i].begin(), push_buffers_[i].end());
      push_buffers_[i].clear();
      push_buffers_[i].shrink_to_fit();
    }
    // sort by data index
    std::sort(idx_val_pairs.begin(), idx_val_pairs.end(),
      [](const std::pair<data_size_t, VAL_T>& a, const std::pair<data_size_t, VAL_T>& b) {
      return a.first < b.first;
    });
    // load delta array
    LoadFromPair(idx_val_pairs);
  }

  void LoadFromPair(const std::vector<std::pair<data_size_t, VAL_T>>& idx_val_pairs) {
    deltas_.clear();