{"id":119618,"date":"2026-10-30T01:09:29","date_gmt":"2026-10-29T17:09:29","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/119618.html"},"modified":"2026-10-30T01:09:29","modified_gmt":"2026-10-29T17:09:29","slug":"%e3%80%90%e9%9a%8f%e7%ac%94%e3%80%91rag%e9%87%8d%e6%8e%92%ef%bc%9a%e5%8f%ac%e5%9b%9e%e4%b9%8b%e5%90%8e%ef%bc%8c%e6%80%8e%e6%a0%b7%e6%8a%8a%e7%9c%9f%e6%ad%a3%e7%9b%b8%e5%85%b3%e7%9a%84%e8%af%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/119618.html","title":{"rendered":"\u3010\u968f\u7b14\u3011RAG\u91cd\u6392\uff1a\u53ec\u56de\u4e4b\u540e\uff0c\u600e\u6837\u628a\u771f\u6b63\u76f8\u5173\u7684\u8bc1\u636e\u6392\u5230\u524d\u9762"},"content":{"rendered":"

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\u5047\u8bbe\u5019\u9009\u987a\u5e8f\u5982\u4e0b：<\/p>\n\n\u7247\u6bb5\u5185\u5bb9\u53ec\u56de\u987a\u5e8f<\/tr>\n\n\n\n\n\n
d1<\/td>\n\u5e74\u4ed8\u5957\u9910\u8d2d\u4e70\u5165\u53e3\u4e0e\u652f\u4ed8\u65b9\u5f0f<\/td>\n1<\/td>\n<\/tr>\n
d2<\/td>\n\u5e74\u4ed8\u5957\u9910\u9000\u6b3e\u6761\u4ef6\u548c\u4f8b\u5916<\/td>\n2<\/td>\n<\/tr>\n
d3<\/td>\n\u53e6\u4e00\u4e2a\u79df\u6237\u7684\u5185\u90e8\u9000\u6b3e\u89c4\u5219<\/td>\n3<\/td>\n<\/tr>\n
d4<\/td>\n\u5df2\u5931\u6548\u7684\u65e7\u7248\u9000\u6b3e\u6761\u6b3e<\/td>\n4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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\"\u91cd\u6392\u5c06\u771f\u6b63\u56de\u7b54\u95ee\u9898\u7684\u9000\u6b3e\u89c4\u5219\u63d0\u524d\"<\/p>\n

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  • \u53bb\u91cd\u4f4d\u7f6e\u3002 \u591a\u8def\u53ec\u56de\u53ef\u80fd\u8fd4\u56de\u540c\u4e00\u7247\u6bb5\u3002\u5982\u679c\u5148\u622a\u65ad\u518d\u53bb\u91cd，\u76f8\u540c\u7247\u6bb5\u4f1a\u6324\u5360\u5019\u9009\u540d\u989d\u3002<\/li>\n
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  • \u8f93\u51fa\u5bf9\u9f50\u3002 \u5206\u6570\u5217\u8868\u5fc5\u987b\u4e0e\u5019\u9009\u4e00\u4e00\u5bf9\u5e94\u3002\u670d\u52a1\u8fd4\u56de\u5c11\u4e00\u4e2a\u5206\u6570\u65f6，\u76f4\u63a5zip\u4f1a\u6084\u6084\u4e22\u6570\u636e\u3002<\/li>\n
  • \u6765\u6e90\u4fdd\u7559\u3002 \u6392\u5e8f\u540e\u4ecd\u5e94\u4fdd\u7559\u6587\u6863\u7f16\u53f7\u3001\u7248\u672c\u3001\u7247\u6bb5\u4f4d\u7f6e，\u4e0d\u80fd\u53ea\u7559\u4e0b\u5206\u6570\u548c\u8131\u79bb\u6765\u6e90\u7684\u6458\u8981\u3002<\/li>\n

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    \u56db\u3001\u5b8c\u6574\u793a\u4f8b：\u5019\u9009\u8fc7\u6ee4\u3001\u8bc4\u5206\u4e0e\u6392\u5e8f<\/h3>\n

    \u793a\u4f8b\u4f7f\u7528Python\u6807\u51c6\u5e93，\u53ef\u4ee5\u76f4\u63a5\u4fdd\u5b58\u4e3arerank_demo.py\u8fd0\u884c\u3002\u6570\u636e\u662f\u6559\u5b66\u7528\u7684\u5019\u9009\u7247\u6bb5；fixture\u63d0\u4f9b\u56fa\u5b9a\u5206\u6570，\u7528\u6765\u68c0\u67e5\u6267\u884c\u6d41\u7a0b，\u4e0d\u4ee3\u8868\u6a21\u578b\u6d4b\u8bc4\u7ed3\u679c\u3002<\/p>\n

    from<\/span> dataclasses import<\/span> dataclass
    \nfrom<\/span> math import<\/span> isfinite<\/p>\n

    @dataclass<\/span>(<\/span>frozen=<\/span>True<\/span>)<\/span>
    \nclass<\/span> Hit<\/span>:<\/span>
    \n id<\/span>:<\/span> str<\/span>
    \n tenant:<\/span> str<\/span>
    \n version:<\/span> str<\/span>
    \n text:<\/span> str<\/span>
    \n recall_score:<\/span> float<\/span><\/p>\n

    def<\/span> rerank<\/span>(<\/span>hits,<\/span> tenant,<\/span> version,<\/span> scorer,<\/span> top_k)<\/span>:<\/span>
    \n if<\/span> top_k <=<\/span> 0<\/span>:<\/span>
    \n raise<\/span> ValueError(<\/span>'top_k must be positive'<\/span>)<\/span>
    \n candidates =<\/span> [<\/span>]<\/span>
    \n seen =<\/span> set<\/span>(<\/span>)<\/span>
    \n for<\/span> hit in<\/span> hits:<\/span>
    \n if<\/span> hit.<\/span>tenant !=<\/span> tenant or<\/span> hit.<\/span>version !=<\/span> version:<\/span>
    \n continue<\/span>
    \n if<\/span> hit.<\/span>id<\/span> in<\/span> seen:<\/span>
    \n continue<\/span>
    \n seen.<\/span>add(<\/span>hit.<\/span>id<\/span>)<\/span>
    \n candidates.<\/span>append(<\/span>hit)<\/span>
    \n if<\/span> not<\/span> candidates:<\/span>
    \n return<\/span> [<\/span>]<\/span>
    \n scores =<\/span> scorer(<\/span>[<\/span>hit.<\/span>text for<\/span> hit in<\/span> candidates]<\/span>)<\/span>
    \n if<\/span> len<\/span>(<\/span>scores)<\/span> !=<\/span> len<\/span>(<\/span>candidates)<\/span>:<\/span>
    \n raise<\/span> ValueError(<\/span>'score count mismatch'<\/span>)<\/span>
    \n if<\/span> any<\/span>(<\/span>not<\/span> isfinite(<\/span>s)<\/span> for<\/span> s in<\/span> scores)<\/span>:<\/span>
    \n raise<\/span> ValueError(<\/span>'invalid score'<\/span>)<\/span>
    \n ranked =<\/span> sorted<\/span>(<\/span>zip<\/span>(<\/span>candidates,<\/span> scores)<\/span>,<\/span>
    \n key=<\/span>lambda<\/span> pair:<\/span> (<\/span>–<\/span>pair[<\/span>1<\/span>]<\/span>,<\/span> pair[<\/span>0<\/span>]<\/span>.<\/span>id<\/span>)<\/span>)<\/span>
    \n return<\/span> ranked[<\/span>:<\/span>top_k]<\/span><\/p>\n

    def<\/span> main<\/span>(<\/span>)<\/span>:<\/span>
    \n hits =<\/span> [<\/span>
    \n Hit(<\/span>'d1'<\/span>,<\/span> 't1'<\/span>,<\/span> 'v2'<\/span>,<\/span> 'Annual plan purchase guide'<\/span>,<\/span> 0.92<\/span>)<\/span>,<\/span>
    \n Hit(<\/span>'d2'<\/span>,<\/span> 't1'<\/span>,<\/span> 'v2'<\/span>,<\/span> 'Annual plan refund rules'<\/span>,<\/span> 0.81<\/span>)<\/span>,<\/span>
    \n Hit(<\/span>'d3'<\/span>,<\/span> 't2'<\/span>,<\/span> 'v2'<\/span>,<\/span> 'Private refund rules'<\/span>,<\/span> 0.98<\/span>)<\/span>,<\/span>
    \n Hit(<\/span>'d4'<\/span>,<\/span> 't1'<\/span>,<\/span> 'v1'<\/span>,<\/span> 'Old refund rules'<\/span>,<\/span> 0.95<\/span>)<\/span>,<\/span>
    \n Hit(<\/span>'d2'<\/span>,<\/span> 't1'<\/span>,<\/span> 'v2'<\/span>,<\/span> 'Annual plan refund rules'<\/span>,<\/span> 0.81<\/span>)<\/span>,<\/span>
    \n ]<\/span>
    \n # Controlled fixture: tests the pipeline, not a learned model.<\/span>
    \n def<\/span> fixture<\/span>(<\/span>texts)<\/span>:<\/span>
    \n assert<\/span> texts ==<\/span> [<\/span>'Annual plan purchase guide'<\/span>,<\/span>
    \n 'Annual plan refund rules'<\/span>]<\/span>
    \n return<\/span> [<\/span>0.2<\/span>,<\/span> 0.9<\/span>]<\/span>
    \n result =<\/span> rerank(<\/span>hits,<\/span> 't1'<\/span>,<\/span> 'v2'<\/span>,<\/span> fixture,<\/span> 2<\/span>)<\/span>
    \n print<\/span>(<\/span>'ranked='<\/span>,<\/span> [<\/span>hit.<\/span>id<\/span> for<\/span> hit,<\/span> _ in<\/span> result]<\/span>,<\/span> sep=<\/span>''<\/span>)<\/span>
    \n assert<\/span> [<\/span>hit.<\/span>id<\/span> for<\/span> hit,<\/span> _ in<\/span> result]<\/span> ==<\/span> [<\/span>'d2'<\/span>,<\/span> 'd1'<\/span>]<\/span>
    \n assert<\/span> rerank(<\/span>[<\/span>]<\/span>,<\/span> 't1'<\/span>,<\/span> 'v2'<\/span>,<\/span> fixture,<\/span> 2<\/span>)<\/span> ==<\/span> [<\/span>]<\/span>
    \n for<\/span> bad in<\/span> (<\/span>lambda<\/span> _<\/span>:<\/span> [<\/span>0.5<\/span>]<\/span>,<\/span> lambda<\/span> _<\/span>:<\/span> [<\/span>float<\/span>(<\/span>'nan'<\/span>)<\/span>,<\/span> 0.3<\/span>]<\/span>)<\/span>:<\/span>
    \n try<\/span>:<\/span>
    \n rerank(<\/span>hits,<\/span> 't1'<\/span>,<\/span> 'v2'<\/span>,<\/span> bad,<\/span> 2<\/span>)<\/span>
    \n except<\/span> ValueError as<\/span> ex:<\/span>
    \n print<\/span>(<\/span>'rejected:'<\/span>,<\/span> ex)<\/span>
    \n else<\/span>:<\/span>
    \n raise<\/span> AssertionError(<\/span>'bad scores accepted'<\/span>)<\/span>
    \n print<\/span>(<\/span>'checks passed'<\/span>)<\/span><\/p>\n

    if<\/span> __name__ ==<\/span> '__main__'<\/span>:<\/span>
    \n main(<\/span>)<\/span><\/p>\n

    \u672c\u6b21\u5b9e\u9645\u8fd0\u884c\u8f93\u51fa：<\/p>\n

    ranked=['d2', 'd1']
    \nrejected: score count mismatch
    \nrejected: invalid score
    \nchecks passed<\/p>\n

    \u8fd9\u6bb5\u7a0b\u5e8f\u9a8c\u8bc1\u4e86\u4e94\u4ef6\u5177\u4f53\u4e8b\u60c5：\u8de8\u79df\u6237\u7247\u6bb5\u88ab\u8fc7\u6ee4；\u65e7\u7248\u672c\u7247\u6bb5\u88ab\u8fc7\u6ee4；\u91cd\u590dd2\u53ea\u4fdd\u7559\u4e00\u6b21；\u6392\u5e8f\u540e\u7684\u7b2c\u4e00\u6761\u4e3ad2；\u6570\u91cf\u9519\u8bef\u548cNaN\u5206\u6570\u4f1a\u88ab\u62d2\u7edd\u3002\u7a7a\u5019\u9009\u76f4\u63a5\u8fd4\u56de\u7a7a\u5217\u8868，\u4e0d\u989d\u5916\u8c03\u7528\u8bc4\u5206\u5668\u3002<\/p>\n

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    \u771f\u5b9e\u6743\u9650\u901a\u5e38\u4e0d\u6b62tenant\u4e00\u4e2a\u5b57\u6bb5，\u8fd8\u5305\u62ec\u7528\u6237\u7ec4\u3001\u6587\u6863\u53ef\u89c1\u8303\u56f4\u548c\u64a4\u6743\u72b6\u6001\u3002\u8fd9\u4e9b\u6761\u4ef6\u5e94\u7531\u68c0\u7d22\u670d\u52a1\u5728\u6570\u636e\u8bbf\u95ee\u5c42\u6267\u884c，\u793a\u4f8b\u4e2d\u7684\u8fc7\u6ee4\u53ea\u662f\u6700\u5c0f\u7ed3\u6784\u3002\u5c24\u5176\u4e0d\u8981\u5148\u628a\u672a\u6388\u6743\u539f\u6587\u4f20\u7ed9\u5916\u90e8\u91cd\u6392\u670d\u52a1，\u518d\u5728\u7ed3\u679c\u9636\u6bb5\u8fc7\u6ee4\u3002<\/p>\n

    \u4e94\u3001\u628a\u56fa\u5b9a\u8bc4\u5206\u5668\u66ff\u6362\u4e3a\u4ea4\u53c9\u7f16\u7801\u5668<\/h3>\n

    \u4e3b\u6d41\u7a0b\u53ea\u8981\u6c42scorer\u63a5\u6536\u6587\u672c\u5217\u8868\u5e76\u8fd4\u56de\u7b49\u957f\u7684\u6709\u9650\u5206\u6570\u5217\u8868，\u56e0\u6b64\u53ef\u4ee5\u6362\u6210\u771f\u5b9e\u6a21\u578b\u9002\u914d\u5668\u3002\u4ee5\u4e0b\u91c7\u7528Sentence Transformers\u5b98\u65b9\u6a21\u578b\u5361\u4e2d\u7684CrossEncoder\u63a5\u53e3：<\/p>\n

    from<\/span> sentence_transformers import<\/span> CrossEncoder<\/p>\n

    model =<\/span> CrossEncoder(<\/span>'cross-encoder\/ms-marco-MiniLM-L6-v2'<\/span>)<\/span>
    \nquery =<\/span> 'Can I get a refund for an annual subscription?'<\/span><\/p>\n

    def<\/span> model_scorer<\/span>(<\/span>texts)<\/span>:<\/span>
    \n pairs =<\/span> [<\/span>(<\/span>query,<\/span> text)<\/span> for<\/span> text in<\/span> texts]<\/span>
    \n return<\/span> model.<\/span>predict(<\/span>pairs)<\/span>.<\/span>tolist(<\/span>)<\/span><\/p>\n

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    \u4e03\u3001\u600e\u6837\u5224\u65ad\u91cd\u6392\u503c\u5f97\u52a0\u5165<\/h3>\n

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    \u5019\u9009\u8986\u76d6<\/td>\n\u6b63\u786e\u8bc1\u636e\u662f\u5426\u8fdb\u5165N\u6761\u5019\u9009<\/td>\nRecall@N<\/td>\n<\/tr>\n
    \u6392\u5e8f\u8d28\u91cf<\/td>\n\u6709\u7528\u8bc1\u636e\u662f\u5426\u6765\u5230\u524d\u9762<\/td>\nMRR\u3001nDCG@K\u3001\u524dK\u6761\u8986\u76d6<\/td>\n<\/tr>\n
    \u7aef\u5230\u7aef\u6548\u679c<\/td>\n\u56de\u7b54\u662f\u5426\u66f4\u5b8c\u6574\u4e14\u5f15\u7528\u6b63\u786e<\/td>\n\u6761\u4ef6\u9057\u6f0f\u3001\u9519\u8bef\u5f15\u7528\u3001\u5ef6\u8fdf\u4e0e\u6210\u672c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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    \u516b\u3001🧠 \u601d\u7ef4\u5bfc\u56fe<\/h3>\n

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    \u4e0a\u4e00\u7bc7\u8ba8\u8bba\u4e0a\u4e0b\u6587\u538b\u7f29：\u628a\u5197\u4f59\u6587\u5b57\u5220\u6389，\u540c\u65f6\u4fdd\u7559\u6761\u4ef6\u3001\u4f8b\u5916\u548c\u5f15\u7528\u3002\u8fd9\u6b21\u5f80\u524d\u770b\u4e00\u6b65\u2014\u2014\u5982\u679c\u4ea4\u7ed9\u538b\u7f29\u5668\u7684\u5019\u9009\u7247\u6bb5\u672c\u6765\u5c31\u6392\u9519\u4e86，\u6700\u503c\u5f97\u4fdd\u7559\u7684\u8bc1\u636e\u751a\u81f3\u6ca1\u6709\u8fdb\u5165\u6700\u7ec8\u4e0a\u4e0b\u6587，\u518d\u7cbe\u7ec6\u7684\u538b\u7f29\u4e5f\u6551\u4e0d\u56de\u6765\u3002
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