| \begin{tabular}{llrr} | |
| \toprule | |
| Method & Note & Bits/weight & PPL $\downarrow$ \\ | |
| \midrule | |
| bf16 (reference) & --- & 16.00 & 8.11 \\ | |
| \midrule | |
| RTN uniform, group 128 & scalar baseline & 3.25 & 10.49 \\ | |
| RTN uniform, group 128 & scalar baseline & 2.25 & 22793.90 \\ | |
| RVQ, data-free & no LDLQ & 1.51 & 7701.98 \\ | |
| RVQ + LDLQ, no rotation & no incoherence proc. & 1.51 & 352.10 \\ | |
| RVQ + RHT + LDLQ (ours) & & 1.01 & 156.07 \\ | |
| RVQ + RHT + LDLQ (ours) & & 1.51 & 25.54 \\ | |
| RVQ + RHT + LDLQ (ours) & & 2.01 & 12.17 \\ | |
| \quad + frequency-cond. alloc. & rate-matched & 1.51 & 22.02 \\ | |
| \bottomrule | |
| \end{tabular} |