Function prune

cpp/src/external/eigen/src/SparseCore/SparseVector.h:208–211

    inline void finalize() {}

    void prune(const Scalar& reference, const RealScalar& epsilon = NumTraits<RealScalar>::dummy_precision())
    {
      m_data.prune(reference,epsilon);
    }

    void resize(Index rows, Index cols)
    {