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余弦相似度 0.82 说明什么?在减去零模型之前,它什么也不说明

【锚点】这一篇只钉一个判断:【余弦相似度不是「语义距离」的读数,而是「共享均值方向 + 高方差维度」的读数;不报零模型基线的相似度结论,是不可复现的仪器噪声。】 【显式】先给一个能在草稿纸上验算的算术。设每个表示 x = m + r,m 是所有表示共享的均值方向、‖m‖=1,r 是与 m 垂直的残差、‖r‖=ε、方向随机。那么任意两个表示: cos(x,y) ≈ (1 + ε²·c) / (1…

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