Function GetClassSplitMinLen

catboost/libs/data/objects_grouping.h:243–254

    );

    static inline ui32 GetClassSplitMinLen(
        ui32 objectCount,
        const TVector<TVector<ui32>>& splittedByClass
    ) {
        ui32 minLen = objectCount;
        for (const auto& part : splittedByClass) {
            if (part.size() < (size_t)minLen) {
                minLen = (ui32)part.size();
            }
        }
        return minLen;
    }

    template <class TClassId>
    TVector<TVector<ui32>> SplitByClass(