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Update deeplearning-ai-rag-course-intro-1.md
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content/Blog/deeplearning-ai-rag-course-intro-1.md

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\text{Recall@}k=\frac{\#\text{ relevant in top-}k}{|\text{Relevant}|}
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$$
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* Precision\@k:前 k 个结果中有多少比例是相关文档;
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* Recall\@k:前 k 个结果覆盖了多少比例的相关文档。
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* Precision@k:前 k 个结果中有多少比例是相关文档;
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* Recall@k:前 k 个结果覆盖了多少比例的相关文档。
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通常,召回率上升往往会带来精度下降,因此需要根据场景设定合适的 k 值。
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