Method addFeaturesFrom

src/io/dataset.cpp:1046–1081

}

void Dataset::addFeaturesFrom(Dataset* other) {
  if (other->num_data_ != num_data_) {
    throw std::runtime_error("Cannot add features from other Dataset with a different number of rows");
  }
  PushVector(&feature_names_, other->feature_names_);
  PushVector(&feature2subfeature_, other->feature2subfeature_);
  PushVector(&group_feature_cnt_, other->group_feature_cnt_);
  PushVector(&forced_bin_bounds_, other->forced_bin_bounds_);
  feature_groups_.reserve(other->feature_groups_.size());
  for (auto& fg : other->feature_groups_) {
    feature_groups_.emplace_back(new FeatureGroup(*fg));
  }
  for (auto feature_idx : other->used_feature_map_) {
    if (feature_idx >= 0) {
      used_feature_map_.push_back(feature_idx + num_features_);
    } else {
      used_feature_map_.push_back(-1);  // Unused feature.
    }
  }
  PushOffset(&real_feature_idx_, other->real_feature_idx_, num_total_features_);
  PushOffset(&feature2group_, other->feature2group_, num_groups_);
  auto bin_offset = group_bin_boundaries_.back();
  // Skip the leading 0 when copying group_bin_boundaries.
  for (auto i = other->group_bin_boundaries_.begin()+1; i < other->group_bin_boundaries_.end(); ++i) {
    group_bin_boundaries_.push_back(*i + bin_offset);
  }
  PushOffset(&group_feature_start_, other->group_feature_start_, num_features_);

  PushClearIfEmpty(&monotone_types_, num_total_features_, other->monotone_types_, other->num_total_features_, (int8_t)0);
  PushClearIfEmpty(&feature_penalty_, num_total_features_, other->feature_penalty_, other->num_total_features_, 1.0);
  PushClearIfEmpty(&max_bin_by_feature_, num_total_features_, other->max_bin_by_feature_, other->num_total_features_, -1);

  num_features_ += other->num_features_;
  num_total_features_ += other->num_total_features_;
  num_groups_ += other->num_groups_;
}

}  // namespace LightGBM