切勿对 DeepSeek V4 Flash 的 KV 缓存进行量化

我认为任何人都不应该对 DS4F 进行 KV 量化。我检查了从 BF16 KV 切换到 Q8 KV 的质量影响（PPL、KLD、Same TopP），结果显示影响显著。这与 Qwen 397B 形成鲜明对比。以下是 DS4F 的结果： ====== 困惑度统计 ====== Mean PPL(Q) : 5.877076 ± 0.042497 Mean PPL(base) : 5.839660 ± 0.041730 Cor(ln(PPL(Q)), ln(PPL(base))): 95.74% Mean ln(PPL(Q)/PPL(base)) : 0.006387 ± 0.002100 Mean PPL(Q)/PPL(base) : 1.006407 ± 0.002114 Mean PPL(Q)-PPL(base) : 0.037416 ± 0.012318 ====== KL 散度统计 ====== Mean KLD: 0.145884 ± 0.001043 Maximum KLD: 12.467786 99.9% KLD: 4.535020 99.0% KLD: 1.857870 95.0% KLD: 0.652148 90.0% KLD: 0.349220 Median KLD: 0.032079 10.0% KLD: 0.000093 5.0% KLD: 0.000012 1.0% KLD: 0.000000 0.1% KLD: -0.000002 Minimum KLD: -0.000025 ====== Token 概率统计 ====== Mean Δp: -0.007 ± 0.031 % Maximum Δp: 99.525% 99.9% Δp: 81.503% 99.0% Δp: 42.054% 95.0% Δp: 14.588% 90.0% Δp: 7.220% 75.0% Δp: 1.066% Median Δp: 0.000% 25.0% Δp: -1.061% 10.0% Δp: -7.112% 5.0% Δp: -14.515% 1.0% Δp: -42.297% 0.1% Δp: -84.157% Minimum Δp: -99.994% RMS Δp : 11.884 ± 0.069 % Same top p: 87.189 ± 0.088 % 作为对比，以下是 Qwen 397B 的结果： ====== 困惑度统计 ====== Mean PPL(Q) : 3.747980 ± 0.020507 Mean PPL(base) : 3.746773 ± 0.020461 Cor(ln(PPL(Q)), ln(PPL(base))): 99.89% Mean ln(PPL(Q)/PPL(base)) : 0.000322 ± 0.000260 Mean PPL(Q)/PPL(base) : 1.000322 ± 0.000260 Mean PPL(Q)-PPL(base) : 0.001207 ± 0.000975 ====== KL 散度统计 ====== Mean KLD: 0.003552 ± 0.000034 Maximum KLD: 2.220941 99.9% KLD: 0.131591 99.0% KLD: 0.043847 95.0% KLD: 0.014439 90.0% KLD: 0.007836 Median KLD: 0.000866 10.0% KLD: 0.000013 5.0% KLD: 0.000004 1.0% KLD: -0.000000 0.1% KLD: -0.000006 Minimum KLD: -0.000176 ====== Token 概率统计 ====== Mean Δp: 0.019 ± 0.005 % Maximum Δp: 39.939% 99.9% Δp: 15.971% 99.0% Δp: 6.618% 95.0% Δp: 2.334% 90.0% Δp: 1.222% 75.0% Δp: 0.233% Median Δp: 0.000% 25.0% Δp: -0.219% 10.0% Δp: -1.183% 5.0% Δp: -2.258% 1.0% Δp: -6.245% 0.1% Δp: -14.757% Minimum Δp: -88.445% RMS Δp : 2.024 ± 0.022 % Same top p: 97.929 ± 0.037 %