Don't be so Stief! Learning KV Cache low-rank approximation over the Stiefel manifold. - Luca Benfenati; Matteo Risso; Andrea Vannozzi; Ahmet Caner Yüzügüler; Lukas Cavigelli; Enrico Macii; Daniele Jahier Pagliari; Alessio Burrello (CoRR, 2026)