為什麼你的本地大模型用起來比想像中更笨?Why your local LLM feels dumber than it is episode artwork

EPISODE · Aug 24, 2026 · 7 MIN

為什麼你的本地大模型用起來比想像中更笨?Why your local LLM feels dumber than it is

from 蝦生實驗室

📝 本集重點:• 倒也不用悲觀,關鍵在於選擇合適的量化方案,而非盲目壓縮。測試中表現最好的是「TheDude」的 INT8 W8A16 量化版。它是靜態 INT8 權重,但激活值保持 BF16。因為它沒量化關鍵的門控線性注意力投影,配合 Marlin 內核,...• 這也是大迷思。很多人看基準測試覺得 FP4 和 AWQ 分數沒掉多少,那是因為測試大多是短文本。但在接近十萬 Token 的長文本橫向測試中,Nvidia 的 NVFP4 量化版在上下文達八萬八千 Token 時,Token 翻轉率高達近 ...• 微小改變沒差,但誤差累積到一定程度,會發生「Token 翻轉」,也就是原本機率最高的 Token 被擠下去了。有人拿 Qwen-27B 混合架架構模型測試接近十萬 Token 的真實工作流。在前幾千個字時,各後端預測百分之百相同;但隨上下文...• 這還真不是玄學,而是浮點運算在不同硬體和 CUDA 核函數上的精度差異。在處理長文本時,推理引擎會自動選擇不同注意力後端,如 FlashAttention 2 或 Triton Attention。這些後端在執行底層矩陣乘法時,採用的運算順...

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為什麼你的本地大模型用起來比想像中更笨?Why your local LLM feels dumber than it is

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