The 0.85 threshold is a starting point, not a fixed value. In collections with many legitimate document updates (versioned policies, amended procedures), it needs tuning upward to reduce false positives. The right approach is to baseline your collection’s normal similarity distribution first, then set the threshold at mean + 2 standard deviations. Without baseline profiling, any threshold is a guess.
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，这一点在pg电子官网中也有详细论述
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把抖音电商融入AI聊天、让用户不需要跳转就能购物，是这套防御动作的一小步。