Function CheckPairs

catboost/libs/data/target.cpp:180–215

}

static void CheckPairs(TConstArrayRef<TPairInGroup> pairs, const TObjectsGrouping& objectsGrouping) {
    CB_ENSURE(
        !objectsGrouping.IsTrivial(),
        "Pairs in groups are specified, but there's no group info in dataset"
    );

    for (auto pairIdx : xrange(pairs.size())) {
        const auto& pairInGroup = pairs[pairIdx];
        try {
            CB_ENSURE(
                pairInGroup.GroupIdx < objectsGrouping.GetGroupCount(),
                "GroupIdx is not less than total number of groups (" << objectsGrouping.GetGroupCount() << ')'
            );

            CB_ENSURE(
                pairInGroup.WinnerIdxInGroup != pairInGroup.LoserIdxInGroup,
                "WinnerIdxInGroup is equal to LoserIdxInGroup"
            );
            ui32 groupSize = objectsGrouping.GetGroup(pairInGroup.GroupIdx).GetSize();
            auto checkIdx = [&] (auto idx, TStringBuf fieldName) {
                CB_ENSURE(
                    idx < groupSize,
                    fieldName << " (" << idx << ") > group size (" << groupSize << ')'
                );
            };
            checkIdx(pairInGroup.WinnerIdxInGroup, TStringBuf("WinnerIdxInGroup"));
            checkIdx(pairInGroup.LoserIdxInGroup, TStringBuf("LoserIdxInGroup"));

            CB_ENSURE(pairInGroup.Weight >= 0.0f, "Weight is negative");
        } catch (const TCatBoostException& e) {
            // throw, not ythrow to avoid duplication of line info
            throw TCatBoostException() << "Pair #" << pairIdx << ' ' << pairInGroup << ": "
                << e.what();
        }
    }
}


void NCB::CheckOneGroupInfo(const TQueryInfo& groupInfo) {