Function SumModels

catboost/libs/model/model.cpp:1845–1871

template <typename TBuilderType>
static void SumModels(
    const TVector<const TFullModel*>& modelVector,
    const TVector<double>& weights,
    const TVector<TFloatFeature>& floatFeatures,
    const TVector<TCatFeature>& catFeatures,
    bool allModelsHaveLeafWeights,
    ECtrTableMergePolicy ctrMergePolicy,
    TFullModel* sum
) {
    const auto approxDimension = modelVector.back()->GetDimensionsCount();
    TBuilderType builder(floatFeatures, catFeatures, {}, {}, approxDimension);

    THashMap<TModelCtrBaseMergeKey, TCtrTablesMergeStatus> ctrTablesIndices;

    for (const auto modelId : xrange(modelVector.size())) {
        TScaleAndBias normer = modelVector[modelId]->GetScaleAndBias();
        StreamModelTreesWithoutScaleAndBiasToBuilder(
            *modelVector[modelId]->ModelTrees,
            weights[modelId] * normer.Scale,
            &builder,
            allModelsHaveLeafWeights,
            ctrMergePolicy,
            &ctrTablesIndices
        );
    }
    builder.Build(sum->ModelTrees.GetMutable());
}

TFullModel SumModels(
    const TVector<const TFullModel*> modelVector,