Function Flatten2D

catboost/cuda/gpu_data/doc_parallel_dataset_builder.cpp:8–18

template <typename T>
static TVector<T> Flatten2D(TVector<TVector<T>>&& src) {
    if (src.empty()) {
        return TVector<T>();
    }
    TVector<T> result;
    result.reserve(src.size() * src[0].size());
    for (const auto& v : src) {
        result.insert(result.end(), v.begin(), v.end());
    }
    return result;
}

NCatboostCuda::TDocParallelDataSetsHolder NCatboostCuda::TDocParallelDataSetBuilder::BuildDataSet(const ui32 permutationCount,
                                                                                                  NPar::ILocalExecutor* localExecutor) {