Function ShuffleLearnDataIfNeeded

catboost/private/libs/algo/preprocess.cpp:183–202

}

TDataProviderPtr ShuffleLearnDataIfNeeded(
    const NCatboostOptions::TCatBoostOptions& catBoostOptions,
    TDataProviderPtr learnData,
    NPar::ILocalExecutor* localExecutor,
    TRestorableFastRng64* rand) {

    if (NeedShuffle(
        learnData->MetaInfo.FeaturesLayout->GetCatFeatureCount(),
        learnData->ObjectsData->GetObjectCount(),
        catBoostOptions
    )) {
        auto objectsGroupingSubset = NCB::Shuffle(learnData->ObjectsGrouping, 1, rand);
        return learnData->GetSubset(
            objectsGroupingSubset,
            ParseMemorySizeDescription(catBoostOptions.SystemOptions->CpuUsedRamLimit.Get()),
            localExecutor
        );
    }
    return learnData;
}