Function LoadFeatures

catboost/libs/data/objects.cpp:1078–1182

template <EFeatureType FeatureType, class TColumn>
static void LoadFeatures(
    const TFeaturesLayout& featuresLayout,
    const TFeaturesArraySubsetIndexing* subsetIndexing,
    const TMaybe<TPackedBinaryFeaturesData*> packedBinaryFeaturesData,
    const TMaybe<TExclusiveFeatureBundlesData*> exclusiveFeatureBundlesData,
    const TMaybe<TFeatureGroupsData*> featureGroupsData,
    IBinSaver* binSaver,
    TVector<THolder<TColumn>>* dst
) {
    TVector<TMaybe<TPackedBinaryIndex>>* featureToPackedBinaryIndex;
    if (packedBinaryFeaturesData) {
        featureToPackedBinaryIndex = &(**packedBinaryFeaturesData).FlatFeatureIndexToPackedBinaryIndex;
    } else {
        featureToPackedBinaryIndex = nullptr;
    }

    TVector<TMaybe<TExclusiveBundleIndex>>* featureToBundlePart;
    if (exclusiveFeatureBundlesData) {
        featureToBundlePart = &(**exclusiveFeatureBundlesData).FlatFeatureIndexToBundlePart;
    } else {
        featureToBundlePart = nullptr;
    }

    TVector<TMaybe<TFeaturesGroupIndex>>* featureToGroupPart;
    if (featureGroupsData) {
        featureToGroupPart = &(**featureGroupsData).FlatFeatureIndexToGroupPart;
    } else {
        featureToGroupPart = nullptr;
    }

    dst->clear();
    dst->resize(featuresLayout.GetFeatureCount(FeatureType));

    featuresLayout.IterateOverAvailableFeatures<FeatureType>(
        [&] (TFeatureIdx<FeatureType> featureIdx) {
            ui32 flatFeatureIdx = featuresLayout.GetExternalFeatureIdx(*featureIdx, FeatureType);

            ui32 id;
            ESavedColumnType savedColumnType;
            LoadMulti(binSaver, &id, (ui8*)&savedColumnType);

            CB_ENSURE_INTERNAL(
                flatFeatureIdx == id,
                "deserialized feature id (" << id << ") is not equal to expected flatFeatureIdx ("
                << flatFeatureIdx << ")"
            );


            if (featureToPackedBinaryIndex && (*featureToPackedBinaryIndex)[flatFeatureIdx]) {
                TPackedBinaryIndex packedBinaryIndex = *((*featureToPackedBinaryIndex)[flatFeatureIdx]);

                ui8 bitIdx = 0;
                binSaver->Add(0, &bitIdx);

                CB_ENSURE_INTERNAL(
                    packedBinaryIndex.BitIdx == bitIdx,
                    "deserialized bitIdx (" << bitIdx << ") is not equal to expected packedBinaryIndex.BitIdx ("
                    << packedBinaryIndex.BitIdx << ")"