{"id":87481,"date":"2026-07-30T12:56:28","date_gmt":"2026-07-30T04:56:28","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/87481.html"},"modified":"2026-07-30T12:56:28","modified_gmt":"2026-07-30T04:56:28","slug":"rag%e6%a0%b8%e5%bf%83%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/87481.html","title":{"rendered":"RAG\u6838\u5fc3\u539f\u7406"},"content":{"rendered":"<h2>RAG \u6838\u5fc3\u539f\u7406\u8be6\u89e3&#xff1a;\u4ece Embedding \u5230 HNSW \u518d\u5230\u5b8c\u6574\u68c0\u7d22\u94fe\u8def<\/h2>\n<h3>1. \u4e3a\u4ec0\u4e48\u9700\u8981 RAG\u2014\u2014LLM \u7684\u5148\u5929\u5c40\u9650<\/h3>\n<p>\u5927\u8bed\u8a00\u6a21\u578b&#xff08;LLM&#xff09;\u5b58\u5728\u4e09\u4e2a\u6838\u5fc3\u7f3a\u9677&#xff1a;<\/p>\n<ul>\n<li>\u77e5\u8bc6\u622a\u6b62\u65e5\u671f&#xff1a;\u8bad\u7ec3\u6570\u636e\u6709\u622a\u6b62\u65f6\u95f4&#xff0c;\u65e0\u6cd5\u77e5\u6653\u4e4b\u540e\u53d1\u751f\u7684\u65b0\u5185\u5bb9<\/li>\n<li>\u5e7b\u89c9&#xff1a;\u9047\u5230\u77e5\u8bc6\u76f2\u533a\u4e0d\u4f1a\u5982\u5b9e\u56de\u590d&#034;\u6211\u4e0d\u77e5\u9053&#034;&#xff0c;\u800c\u662f\u5f3a\u884c\u7f16\u9020<\/li>\n<li>\u65e0\u6cd5\u8bc6\u522b\u79c1\u6709\u77e5\u8bc6&#xff1a;\u5185\u90e8\u6587\u6863\u3001\u4ee3\u7801\u5e93\u3001\u4e1a\u52a1\u89c4\u5219\u4e0d\u4f1a\u51fa\u73b0\u5728\u516c\u5f00\u8bad\u7ec3\u6570\u636e\u4e2d<\/li>\n<\/ul>\n<p>RAG&#xff08;Retrieval-Augmented Generation&#xff0c;\u68c0\u7d22\u589e\u5f3a\u751f\u6210&#xff09;\u7684\u601d\u8def\u662f&#xff1a;\u8ba9 LLM \u5148\u68c0\u7d22\u5916\u90e8\u4fe1\u606f&#xff0c;\u518d\u7ed3\u5408\u68c0\u7d22\u5185\u5bb9\u7ed9\u51fa\u56de\u7b54\u3002\u6d41\u7a0b\u5982\u4e0b&#xff1a;<\/p>\n<p>\u7528\u6237\u63d0\u95ee \u2192 \u68c0\u7d22\u76f8\u5173\u5916\u90e8\u4fe1\u606f \u2192 \u4fe1\u606f\u6ce8\u5165 prompt \u2192 LLM \u57fa\u4e8e\u4fe1\u606f\u56de\u7b54<\/p>\n<p>RAG \u7684\u5b8c\u6574\u6d41\u6c34\u7ebf\u5206\u4e3a\u4e24\u6bb5&#xff1a;<\/p>\n<ul>\n<li>\u79bb\u7ebf\u9636\u6bb5&#xff1a;\u6587\u6863 \u2192 \u5207\u6bb5&#xff08;Chunking&#xff09;\u2192 Embedding&#xff08;\u5411\u91cf\u5316&#xff09;\u2192 \u7d22\u5f15\u5199\u5165&#xff08;\u5b58\u5165\u5411\u91cf\u5e93&#xff09;<\/li>\n<li>\u5728\u7ebf\u9636\u6bb5&#xff1a;\u7528\u6237\u67e5\u8be2 \u2192 Query Rewrite \u2192 \u5143\u6570\u636e\u8fc7\u6ee4 \u2192 \u4e24\u8def\u53ec\u56de&#xff08;ANN &#043; BM25&#xff09;\u2192 RRF \u878d\u5408 \u2192 Rerank \u7cbe\u6392 \u2192 LLM \u751f\u6210\u7b54\u6848<\/li>\n<\/ul>\n<p>RAG \u597d\u4e0d\u597d\u7528&#xff0c;\u5173\u952e\u4e0d\u5728 LLM&#xff0c;\u800c\u5728\u4e8e\u68c0\u7d22\u8d28\u91cf\u3002\u68c0\u7d22\u56de\u6765\u7684\u5185\u5bb9\u4e0d\u5bf9&#xff0c;LLM \u518d\u5f3a\u4e5f\u662f\u5783\u573e\u8fdb\u5783\u573e\u51fa\u3002<\/p>\n<hr \/>\n<h3>2. Embedding&#xff1a;\u6587\u672c\u5411\u91cf\u5316<\/h3>\n<h4>2.1 \u6838\u5fc3\u601d\u60f3<\/h4>\n<p>\u4f20\u7edf\u641c\u7d22\u9760\u5b57\u9762\u5339\u914d&#xff0c;SQL \u7684 LIKE \u53ea\u80fd\u547d\u4e2d\u5305\u542b\u76f8\u540c\u6587\u5b57\u7684\u7ed3\u679c&#xff0c;\u65e0\u6cd5\u7406\u89e3\u8bed\u4e49\u7b49\u4ef7\u3002Embedding \u89e3\u51b3\u7684\u662f&#034;\u628a\u6587\u672c\u53d8\u6210\u53ef\u8ba1\u7b97\u7684\u6570\u636e&#034;\u2014\u2014\u5c06\u6587\u672c\u6620\u5c04\u5230\u5411\u91cf\u7a7a\u95f4&#xff0c;\u8bed\u4e49\u76f8\u4f3c\u5ea6\u8f6c\u5316\u4e3a\u5411\u91cf\u8ddd\u79bb\u8ba1\u7b97\u3002<\/p>\n<h4>2.2 \u5411\u91cf<\/h4>\n<p>\u5411\u91cf\u662f\u4e00\u7ec4\u6709\u5e8f\u7684\u6d6e\u70b9\u6570&#xff0c;\u4e3b\u6d41 Embedding \u6a21\u578b\u8f93\u51fa\u7ef4\u5ea6\u4e3a 768\u30011024 \u6216 1536\u3002\u4e24\u4e2a\u5411\u91cf\u5728\u7a7a\u95f4\u4e2d\u7684\u8ddd\u79bb\u8d8a\u8fd1&#xff0c;\u4ee3\u8868\u5b83\u4eec\u5bf9\u5e94\u7684\u6587\u672c\u8bed\u4e49\u8d8a\u76f8\u4f3c\u3002<\/p>\n<h4>2.3 Embedding \u6a21\u578b\u8bad\u7ec3<\/h4>\n<p>Embedding \u6a21\u578b\u901a\u8fc7\u5bf9\u6bd4\u5b66\u4e60\u8bad\u7ec3&#xff1a;\u7ed9\u5b9a\u4e00\u4e2a\u67e5\u8be2\u6587\u672c&#xff0c;\u62c9\u8fd1\u5b83\u4e0e\u6b63\u4f8b&#xff08;\u8bed\u4e49\u76f8\u5173\u7684\u6587\u672c&#xff09;\u7684\u8ddd\u79bb&#xff0c;\u63a8\u8fdc\u5b83\u4e0e\u8d1f\u4f8b&#xff08;\u4e0d\u76f8\u5173\u7684\u6587\u672c&#xff09;\u7684\u8ddd\u79bb\u3002\u8bad\u7ec3\u6570\u636e\u6765\u81ea\u641c\u7d22\u5f15\u64ce\u70b9\u51fb\u65e5\u5fd7\u3001\u95ee\u7b54\u793e\u533a\u91c7\u7eb3\u8bb0\u5f55\u3001\u5e73\u884c\u8bed\u6599\u7b49\u3002<\/p>\n<p>Embedding \u6a21\u578b\u4e0e\u751f\u6210\u5f0f LLM \u7684\u533a\u522b&#xff1a;Embedding \u6a21\u578b\u505a\u7684\u662f\u538b\u7f29\u2014\u2014\u5c06\u8bed\u4e49\u6d53\u7f29\u8fdb\u4e00\u4e2a\u5411\u91cf&#xff1b;LLM \u505a\u7684\u662f\u751f\u6210\u2014\u2014\u6839\u636e\u4e0a\u4e0b\u6587\u8f93\u51fa\u6587\u5b57\u3002\u4e24\u8005\u5728 RAG \u4e2d\u5206\u5de5\u660e\u786e&#xff1a;Embedding \u6a21\u578b\u8d1f\u8d23\u5411\u91cf\u5316&#xff0c;LLM \u8d1f\u8d23\u6700\u7ec8\u7b54\u6848\u751f\u6210\u3002<\/p>\n<h4>2.4 Dense vs Sparse \u5411\u91cf<\/h4>\n<ul>\n<li>Dense&#xff08;\u7a20\u5bc6\u5411\u91cf&#xff09;&#xff1a;\u6bcf\u4e2a\u7ef4\u5ea6\u90fd\u6709\u503c&#xff0c;\u64c5\u957f\u6355\u6349\u8bed\u4e49\u76f8\u4f3c&#xff0c;\u4f46\u5bf9\u4e13\u6709\u540d\u8bcd\u548c\u7f16\u7801\u4e0d\u654f\u611f\u3002\u4f8b\u5982\u641c&#034;\u6570\u636e\u5e93\u8fde\u63a5\u6c60&#034;\u80fd\u547d\u4e2d&#034;DB connection pool \u914d\u7f6e&#034;\u3002<\/li>\n<li>Sparse&#xff08;\u7a00\u758f\u5411\u91cf&#xff09;&#xff1a;\u53ea\u6709\u5c11\u6570\u7ef4\u5ea6\u6709\u503c&#xff0c;\u5bf9\u5e94\u5177\u4f53\u8bcd\u9879&#xff0c;\u64c5\u957f\u7cbe\u786e\u5339\u914d&#xff0c;\u4f46\u6362\u8bcd\u5c31\u641c\u4e0d\u5230\u3002\u4f8b\u5982\u641c&#034;SLB-20250101&#034;\u80fd\u7cbe\u786e\u547d\u4e2d&#xff0c;\u4f46\u641c&#034;\u6570\u636e\u5e93&#034;\u65e0\u6cd5\u547d\u4e2d&#034;DB&#034;\u3002<\/li>\n<\/ul>\n<p>\u4e24\u8005\u662f\u4e92\u8865\u5173\u7cfb&#xff0c;\u4e0d\u662f\u66ff\u4ee3\u5173\u7cfb\u3002\u4e00\u4e2a\u5b8c\u6574\u7684\u68c0\u7d22\u7cfb\u7edf\u9700\u8981\u4e24\u8005\u914d\u5408\u3002<\/p>\n<hr \/>\n<h3>3. Chunking&#xff1a;\u77e5\u8bc6\u5207\u5757\u7b56\u7565<\/h3>\n<h4>3.1 \u4e3a\u4ec0\u4e48\u8981\u5207<\/h4>\n<ul>\n<li>Embedding \u6a21\u578b\u6709\u8f93\u5165\u957f\u5ea6\u4e0a\u9650&#xff08;\u4e3b\u6d41 512-8192 Token&#xff09;<\/li>\n<li>\u8d85\u957f\u6587\u672c\u7684\u8bed\u4e49\u7a00\u91ca&#xff1a;\u4e00\u7bc7\u6db5\u76d6\u591a\u4e2a\u4e3b\u9898\u7684\u6587\u6863&#xff0c;\u5176\u5411\u91cf\u662f\u5404\u4e3b\u9898\u7684&#034;\u5e73\u5747\u503c&#034;&#xff0c;\u5bf9\u4efb\u4f55\u4e00\u4e2a\u5177\u4f53\u4e3b\u9898\u90fd\u4e0d\u591f\u63a5\u8fd1<\/li>\n<li>LLM \u4e0a\u4e0b\u6587\u7a97\u53e3\u6709\u9650&#xff0c;\u9700\u8981\u7cbe\u51c6\u6bb5\u843d\u800c\u975e\u5168\u6587<\/li>\n<\/ul>\n<h4>3.2 \u4e09\u79cd\u7b56\u7565<\/h4>\n<p>\u56fa\u5b9a\u957f\u5ea6\u5207\u5757 &#043; \u6ed1\u52a8\u7a97\u53e3<\/p>\n<p>\u6bcf 500 Token \u4e00\u4e2a Chunk&#xff0c;\u76f8\u90bb Chunk \u4e4b\u95f4\u91cd\u53e0 200 Token\u3002\u91cd\u53e0\u533a\u57df\u8ba9\u8de8\u8fb9\u754c\u7684\u53e5\u5b50\u5b8c\u6574\u51fa\u73b0\u5728\u81f3\u5c11\u4e00\u4e2a Chunk \u4e2d&#xff0c;\u5927\u5e45\u51cf\u5c11\u4fe1\u606f\u4e22\u5931\u3002<\/p>\n<p>\u6587\u6863: [0..500] [300..800] [600..1100] &#8230;<\/p>\n<p>\u8bed\u4e49\u5207\u5757<\/p>\n<p>\u6309\u6587\u6863\u7684\u81ea\u7136\u7ed3\u6784&#xff08;\u6807\u9898\u3001\u6bb5\u843d\u3001\u5c0f\u8282&#xff09;\u6765\u5207\u3002\u6bcf\u4e2a Chunk \u4fdd\u6301\u8bed\u4e49\u5b8c\u6574\u6027&#xff0c;\u4e0d\u4f1a\u51fa\u73b0\u53e5\u5b50\u88ab\u8170\u65a9\u7684\u60c5\u51b5\u3002\u9700\u8981\u6587\u6863\u672c\u8eab\u6709\u7ed3\u6784&#xff08;Markdown \u6807\u9898\u3001HTML \u6807\u7b7e\u7b49&#xff09;\u3002<\/p>\n<p>Parent-Child Chunk<\/p>\n<ul>\n<li>Parent Chunk&#xff1a;\u5927\u5757&#xff0c;\u4fdd\u7559\u5b8c\u6574\u4e0a\u4e0b\u6587<\/li>\n<li>Child Chunk&#xff1a;\u5c0f\u5757&#xff0c;\u7528\u4e8e\u68c0\u7d22&#xff08;\u53ec\u56de\u7387\u9ad8&#xff09;<\/li>\n<li>\u68c0\u7d22\u65f6\u7528 Child \u5339\u914d&#xff0c;\u8fd4\u56de\u65f6\u5c06\u5bf9\u5e94\u7684 Parent \u9001\u5165 LLM<\/li>\n<\/ul>\n<p>\u517c\u987e\u4e86\u53ec\u56de\u7387\u548c\u4e0a\u4e0b\u6587\u5b8c\u6574\u6027\u3002<\/p>\n<h4>3.3 \u6838\u5fc3\u6743\u8861<\/h4>\n<p>\u5207\u592a\u5c0f\u5bfc\u81f4\u4e0a\u4e0b\u6587\u65ad\u88c2&#xff0c;\u7b54\u6848\u88ab\u8170\u65a9&#xff1b;\u5207\u592a\u5927\u5bfc\u81f4\u8bed\u4e49\u7a00\u91ca&#xff0c;precision \u4e0b\u964d\u3002\u56fa\u5b9a\u957f\u5ea6 &#043; \u6ed1\u52a8\u7a97\u53e3\u662f\u6027\u4ef7\u6bd4\u6700\u9ad8\u7684\u8d77\u70b9&#xff0c;\u8bed\u4e49\u5207\u5757\u548c Parent-Child \u6309\u9700\u53e0\u52a0\u3002<\/p>\n<hr \/>\n<h3>4. \u76f8\u4f3c\u5ea6\u5ea6\u91cf<\/h3>\n<p>\u7ed9\u5b9a\u4e24\u4e2a\u5411\u91cf&#xff0c;\u9700\u8981\u7528\u5ea6\u91cf\u7b97\u6cd5\u786e\u5b9a\u76f8\u4f3c\u7a0b\u5ea6\u3002<\/p>\n<p>\u4f59\u5f26\u76f8\u4f3c\u5ea6&#xff1a;\u8861\u91cf\u4e24\u4e2a\u5411\u91cf\u65b9\u5411\u7684\u63a5\u8fd1\u7a0b\u5ea6\u3002\u503c\u57df [-1, 1]&#xff0c;1 \u8868\u793a\u65b9\u5411\u4e00\u81f4\u3002Embedding \u6a21\u578b\u8bad\u7ec3\u65f6\u5373\u7528\u6b64\u5ea6\u91cf&#xff0c;\u662f\u7edd\u5bf9\u4e3b\u6d41\u7684\u9009\u62e9\u3002<\/p>\n<p>cos(\u03b8) &#061; (A \u00b7 B) \/ (|A| \u00d7 |B|)<\/p>\n<p>\u6b27\u6c0f\u8ddd\u79bb&#xff1a;\u8861\u91cf\u4e24\u4e2a\u70b9\u5728\u7a7a\u95f4\u4e2d\u7684\u76f4\u7ebf\u8ddd\u79bb\u3002\u53d7\u5411\u91cf\u957f\u5ea6\u5f71\u54cd\u5927&#xff0c;\u4e24\u4e2a\u610f\u601d\u76f8\u540c\u4f46\u957f\u5ea6\u4e0d\u540c\u7684\u5411\u91cf&#xff0c;\u6b27\u6c0f\u8ddd\u79bb\u53ef\u80fd\u5f88\u5927\u4f46\u4f59\u5f26\u76f8\u4f3c\u5ea6\u5f88\u9ad8\u3002\u4e0d\u4f18\u5148\u9009\u7528\u3002<\/p>\n<p>\u70b9\u79ef&#xff1a;\u5f53\u5411\u91cf\u5df2\u505a L2 \u5f52\u4e00\u5316&#xff08;\u957f\u5ea6\u4e3a 1&#xff09;\u65f6&#xff0c;\u70b9\u79ef\u7b49\u4e8e\u4f59\u5f26\u76f8\u4f3c\u5ea6\u3002\u5982\u679c\u5411\u91cf\u5df2\u5f52\u4e00\u5316&#xff0c;\u7528\u70b9\u79ef\u6548\u7387\u66f4\u9ad8\u3002<\/p>\n<p>\u5efa\u8bae&#xff1a;\u4e0d\u786e\u5b9a\u7528\u54ea\u4e2a&#xff0c;\u5c31\u7528\u4f59\u5f26\u76f8\u4f3c\u5ea6\u3002<\/p>\n<hr \/>\n<h3>5. HNSW&#xff1a;\u9ad8\u6548\u8fd1\u4f3c\u6700\u8fd1\u90bb\u641c\u7d22<\/h3>\n<h4>5.1 \u7cbe\u786e KNN \u4e0d\u53ef\u884c<\/h4>\n<p>\u7cbe\u786e KNN \u9700\u8981\u9010\u6761\u904d\u5386\u6240\u6709\u5411\u91cf\u8ba1\u7b97\u76f8\u4f3c\u5ea6&#xff0c;\u590d\u6742\u5ea6 O(N\u00d7D)\u3002\u767e\u4e07\u7ea7\u6570\u636e\u91cf\u4e0b&#xff0c;\u4e00\u6b21\u67e5\u8be2\u9700\u8981\u767e\u4e07\u6b21\u9ad8\u7ef4\u5411\u91cf\u8ba1\u7b97&#xff0c;\u6027\u80fd\u65e0\u6cd5\u63a5\u53d7\u3002<\/p>\n<p>ANN&#xff08;\u8fd1\u4f3c KNN&#xff09;\u8def\u7ebf&#xff1a;\u7528\u7d22\u5f15\u7ed3\u6784\u5feb\u901f\u5b9a\u4f4d\u5019\u9009\u533a\u57df&#xff0c;\u53ea\u5bf9\u5c11\u6570\u5019\u9009\u5411\u91cf\u505a\u7cbe\u786e\u8ba1\u7b97\u3002\u7528\u53ef\u63a7\u7684\u53ec\u56de\u635f\u5931&#xff0c;\u6362\u53d6\u6570\u91cf\u7ea7\u7684\u6027\u80fd\u63d0\u5347\u3002<\/p>\n<h4>5.2 \u6838\u5fc3\u539f\u7406<\/h4>\n<p>HNSW&#xff08;Hierarchical Navigable Small World&#xff09;\u878d\u5408\u4e86\u4e24\u79cd\u6570\u636e\u7ed3\u6784\u7684\u601d\u60f3&#xff1a;<\/p>\n<ul>\n<li>\u8df3\u8868\u7684\u5206\u5c42\u601d\u60f3&#xff1a;\u5728\u591a\u5c42\u7ed3\u6784\u4e2d&#xff0c;\u4e0a\u5c42\u8282\u70b9\u5c11\u3001\u8de8\u5ea6\u5927&#xff0c;\u9010\u5c42\u7f29\u5c0f\u8303\u56f4\u3002\u67e5\u627e\u65f6\u4ece\u9876\u5c42\u8df3\u8fc7\u5927\u91cf\u5143\u7d20&#xff0c;\u590d\u6742\u5ea6\u4ece O(n) \u964d\u5230 O(log n)\u3002<\/li>\n<li>\u53ef\u5bfc\u822a\u5c0f\u4e16\u754c\u56fe\u7684\u8d2a\u5fc3\u641c\u7d22&#xff1a;\u6bcf\u5c42\u56fe\u4e2d&#xff0c;\u6bcf\u4e2a\u8282\u70b9\u8fde\u63a5\u6700\u8fd1\u7684 M \u4e2a\u90bb\u5c45\u3002\u641c\u7d22\u65f6\u4ece\u5f53\u524d\u8282\u70b9\u51fa\u53d1&#xff0c;\u9009\u62e9\u79bb\u76ee\u6807\u6700\u8fd1\u7684\u90bb\u5c45&#xff0c;\u91cd\u590d\u76f4\u5230\u6536\u655b\u3002<\/li>\n<\/ul>\n<p>\u4e24\u8005\u7ed3\u5408&#xff1a;\u5206\u5c42\u63d0\u4f9b\u5feb\u901f\u901a\u9053&#xff0c;\u8d2a\u5fc3\u641c\u7d22\u5728\u6bcf\u5c42\u5bfc\u822a\u3002<\/p>\n<h4>5.3 \u5206\u5c42\u56fe\u7ed3\u6784<\/h4>\n<ul>\n<li>\u9ad8\u5c42&#xff1a;\u8282\u70b9\u6570\u91cf\u5c11&#xff0c;\u8fb9\u8de8\u5ea6\u5927<\/li>\n<li>\u5e95\u5c42&#xff1a;\u5305\u542b\u5168\u90e8\u8282\u70b9&#xff0c;\u8fb9\u5bc6\u96c6&#xff0c;\u80fd\u7cbe\u786e\u5b9a\u4f4d<\/li>\n<\/ul>\n<p>\u5c42\u7ea7\u5206\u5e03\u670d\u4ece\u6307\u6570\u8870\u51cf&#xff1a;\u6bcf\u5f80\u4e0a\u4e00\u5c42&#xff0c;\u8282\u70b9\u6570\u7ea6\u9664\u4ee5 M&#xff08;M \u9ed8\u8ba4 16&#xff09;\u3002100 \u4e07\u8282\u70b9\u65f6&#xff0c;\u6700\u9ad8\u5c42\u7ea6 5-6 \u5c42\u3002<\/p>\n<h4>5.4 \u63d2\u5165\u6d41\u7a0b<\/h4>\n<li>\u968f\u673a\u5b9a\u5c42\u9ad8&#xff1a;\u6982\u7387 P(level \u2265 L) &#061; (1\/M)^L&#xff0c;\u5927\u591a\u6570\u8282\u70b9\u53ea\u5f85\u5728\u5e95\u5c42<\/li>\n<li>\u5728\u5df2\u6709\u56fe\u4e0a\u505a\u8d2a\u5fc3\u641c\u7d22&#xff0c;\u4ece\u9876\u5c42\u5f00\u59cb\u9010\u5c42\u5f80\u4e0b&#xff0c;\u627e\u5230\u79bb\u5b83\u6700\u8fd1\u7684\u8282\u70b9<\/li>\n<li>\u5728\u8282\u70b9\u6240\u5c5e\u7684\u6bcf\u4e00\u5c42&#xff0c;\u4e0e\u6700\u8fd1\u7684 M \u4e2a\u90bb\u5c45\u53cc\u5411\u8fde\u8fb9<\/li>\n<li>\u526a\u679d&#xff1a;\u5982\u679c\u67d0\u4e2a\u90bb\u5c45\u7684\u8fb9\u6570\u8d85\u8fc7 M&#xff0c;\u53ea\u4fdd\u7559\u6700\u8fd1\u7684 M \u6761<\/li>\n<h4>5.5 \u641c\u7d22\u6d41\u7a0b<\/h4>\n<li>\u4ece\u6700\u9876\u5c42\u7684\u5165\u53e3\u8282\u70b9\u5f00\u59cb&#xff0c;\u505a\u8d2a\u5fc3\u641c\u7d22&#xff0c;\u8d70\u5230\u8be5\u5c42\u5c40\u90e8\u6700\u8fd1\u70b9<\/li>\n<li>\u964d\u5230\u4e0b\u4e00\u5c42&#xff0c;\u4ee5\u4e0a\u4e00\u5c42\u7684\u7ec8\u70b9\u4e3a\u8d77\u70b9&#xff0c;\u7ee7\u7eed\u8d2a\u5fc3\u641c\u7d22<\/li>\n<li>\u91cd\u590d\u76f4\u5230\u6700\u5e95\u5c42&#xff0c;\u505a\u6700\u540e\u4e00\u8f6e\u7cbe\u7ec6\u641c\u7d22<\/li>\n<li>\u8fd4\u56de\u9014\u4e2d\u9047\u5230\u7684\u3001\u8ddd\u79bb\u6700\u8fd1\u7684 K \u4e2a\u8282\u70b9<\/li>\n<h4>5.6 \u4e09\u4e2a\u5173\u952e\u53c2\u6570<\/h4>\n<table>\n<tr>\u53c2\u6570\u4f5c\u7528\u8bf4\u660e<\/tr>\n<tbody>\n<tr>\n<td>M<\/td>\n<td>\u6bcf\u8282\u70b9\u6bcf\u5c42\u6700\u591a\u8fde\u8fb9\u6570<\/td>\n<td>\u8d8a\u5927\u641c\u7d22\u8d8a\u7cbe\u786e&#xff0c;\u4f46\u7d22\u5f15\u66f4\u5927\u3001\u6784\u5efa\u66f4\u6162<\/td>\n<\/tr>\n<tr>\n<td>efConstruction<\/td>\n<td>\u7d22\u5f15\u6784\u5efa\u65f6\u7684\u641c\u7d22\u5bbd\u5ea6<\/td>\n<td>\u8d8a\u5927\u53ec\u56de\u8d8a\u9ad8&#xff0c;\u4f46\u6784\u5efa\u65f6\u95f4\u8d8a\u957f<\/td>\n<\/tr>\n<tr>\n<td>efSearch<\/td>\n<td>\u67e5\u8be2\u65f6\u7684\u641c\u7d22\u5bbd\u5ea6<\/td>\n<td>\u8d8a\u5927\u53ec\u56de\u8d8a\u9ad8&#xff0c;\u4f46\u67e5\u8be2\u5ef6\u8fdf\u8d8a\u9ad8<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>6. \u5b8c\u6574\u68c0\u7d22\u94fe\u8def<\/h3>\n<h4>6.1 Query Rewrite<\/h4>\n<p>\u7528\u6237\u539f\u59cb\u67e5\u8be2\u53ef\u80fd\u542b\u6df7\u3001\u4e0d\u5b8c\u6574\u6216\u4e0d\u89c4\u8303\u3002\u6539\u5199\u7b56\u7565\u5305\u62ec&#xff1a;\u6269\u5c55\u5173\u952e\u8bcd\u3001\u4fee\u6b63\u62fc\u5199\u9519\u8bef\u3001\u8865\u5145\u4e0a\u4e0b\u6587\u4fe1\u606f\u3002\u6539\u5199\u540e\u7684\u67e5\u8be2\u66f4\u6709\u5229\u4e8e\u540e\u7eed\u68c0\u7d22\u3002<\/p>\n<h4>6.2 \u5143\u6570\u636e\u8fc7\u6ee4<\/h4>\n<p>\u5728\u68c0\u7d22\u524d&#xff0c;\u6309\u65f6\u95f4\u8303\u56f4\u3001\u6587\u6863\u7c7b\u578b\u3001\u6743\u9650\u7b49\u7ea7\u7b49\u5b57\u6bb5\u8fc7\u6ee4&#xff0c;\u7f29\u5c0f\u641c\u7d22\u7a7a\u95f4\u3002\u8fd9\u662f\u63d0\u9ad8\u68c0\u7d22\u6548\u7387\u7684\u7b2c\u4e00\u9053\u8fc7\u6ee4\u3002<\/p>\n<h4>6.3 \u4e24\u8def\u4e92\u8865\u68c0\u7d22<\/h4>\n<ul>\n<li>ANN&#xff08;\u5411\u91cf\u68c0\u7d22&#xff09;&#xff1a;\u57fa\u4e8e\u8bed\u4e49&#xff0c;\u53ec\u56de\u610f\u601d\u76f8\u8fd1\u7684\u7ed3\u679c<\/li>\n<li>BM25&#xff08;\u5173\u952e\u8bcd\u68c0\u7d22&#xff09;&#xff1a;\u57fa\u4e8e\u5b57\u9762&#xff0c;\u53ec\u56de\u7cbe\u786e\u5339\u914d\u7684\u7ed3\u679c<\/li>\n<\/ul>\n<p>\u4e24\u8def\u5404\u81ea\u6709\u76f2\u533a\u2014\u2014ANN \u5bf9\u4e13\u6709\u540d\u8bcd\u4e0d\u654f\u611f&#xff0c;BM25 \u65e0\u6cd5\u7406\u89e3\u8bed\u4e49\u7b49\u4ef7\u3002\u9700\u8981\u878d\u5408\u3002<\/p>\n<h4>6.4 RRF&#xff08;Reciprocal Rank Fusion&#xff09;<\/h4>\n<p>\u5404\u8def\u68c0\u7d22\u7ed3\u679c\u7684\u5206\u6570\u5c3a\u5ea6\u4e0d\u540c&#xff0c;\u4e0d\u80fd\u76f4\u63a5\u76f8\u52a0\u3002RRF \u7684\u6838\u5fc3\u7406\u5ff5&#xff1a;\u4e0d\u62fc\u5206\u6570\u62fc\u6392\u540d\u3002\u6bcf\u4e2a\u7ed3\u679c\u5728\u5404\u81ea\u6392\u5e8f\u4e2d\u7684\u6392\u540d\u51b3\u5b9a\u6700\u7ec8\u5f97\u5206&#xff1a;<\/p>\n<p>score &#061; \u03a3 1 \/ (k &#043; rank_i)<\/p>\n<p>\u5176\u4e2d rank_i \u662f\u7ed3\u679c\u5728\u7b2c i \u8def\u68c0\u7d22\u4e2d\u7684\u6392\u540d&#xff0c;k \u662f\u5e38\u6570&#xff08;\u901a\u5e38 60&#xff09;\u3002<\/p>\n<h4>6.5 Rerank&#xff08;\u7cbe\u6392&#xff09;<\/h4>\n<p>\u7c97\u53ec\u56de\u9636\u6bb5\u53d6 Top-K \u5019\u9009\u540e&#xff0c;\u7528\u4ea4\u53c9\u7f16\u7801\u5668&#xff08;Cross-Encoder&#xff09;\u5bf9\u6bcf\u4e2a\u5019\u9009\u4e0e\u67e5\u8be2\u505a\u7cbe\u7ec6\u7684\u8bed\u4e49\u5339\u914d\u6253\u5206&#xff0c;\u91cd\u6392\u540e\u53d6 Top-N \u9001\u5165 LLM\u3002\u4e24\u9636\u6bb5\u68c0\u7d22&#xff1a;\u5148\u5feb\u540e\u51c6\u3002<\/p>\n<hr \/>\n<h3>7. \u603b\u7ed3<\/h3>\n<p>RAG \u7684\u5b8c\u6574\u68c0\u7d22\u94fe\u8def&#xff1a;<\/p>\n<p>Query Rewrite \u2192 \u5143\u6570\u636e\u8fc7\u6ee4 \u2192 ANN &#043; BM25 \u4e24\u8def\u53ec\u56de \u2192 RRF \u878d\u5408 \u2192 Rerank \u7cbe\u6392 \u2192 LLM \u751f\u6210<\/p>\n<p>RAG \u6548\u679c\u7684\u597d\u574f\u53d6\u51b3\u4e8e\u68c0\u7d22\u8d28\u91cf\u3002\u6392\u67e5 RAG \u95ee\u9898\u65f6&#xff0c;\u6309\u94fe\u8def\u9010\u5c42\u5b9a\u4f4d&#xff1a;<\/p>\n<li>\u5148\u770b Chunk \u7b56\u7565\u2014\u2014\u5207\u5757\u7c92\u5ea6\u662f\u5426\u5408\u7406&#xff0c;\u6709\u65e0\u8de8\u5757\u622a\u65ad<\/li>\n<li>\u518d\u770b Embedding \u6a21\u578b\u2014\u2014\u662f\u5426\u5339\u914d\u6587\u6863\u7684\u8bed\u8a00\u548c\u9886\u57df<\/li>\n<li>\u63a5\u7740\u770b\u68c0\u7d22\u7b97\u6cd5\u2014\u2014HNSW \u53c2\u6570\u662f\u5426\u8c03\u4f18&#xff0c;ANN \u4e0e BM25 \u662f\u5426\u4e92\u8865<\/li>\n<li>\u6700\u540e\u770b\u878d\u5408\u4e0e\u7cbe\u6392\u2014\u2014RRF \u548c Rerank \u662f\u5426\u6709\u6548\u8fc7\u6ee4\u566a\u58f0<\/li>\n","protected":false},"excerpt":{"rendered":"<p>RAG \u6838\u5fc3\u539f\u7406\u8be6\u89e3&#xff1a;\u4ece Embedding \u5230 HNSW \u518d\u5230\u5b8c\u6574\u68c0\u7d22\u94fe\u8def<br \/>\n1. \u4e3a\u4ec0\u4e48\u9700\u8981 RAG\u2014\u2014LLM \u7684\u5148\u5929\u5c40\u9650<br \/>\n\u5927\u8bed\u8a00\u6a21\u578b&#xff08;LLM&#xff09;\u5b58\u5728\u4e09\u4e2a\u6838\u5fc3\u7f3a\u9677&#xff1a;<br \/>\n\u77e5\u8bc6\u622a\u6b62\u65e5\u671f&#xff1a;\u8bad\u7ec3\u6570\u636e\u6709\u622a\u6b62\u65f6\u95f4&#xff0c;\u65e0\u6cd5\u77e5\u6653\u4e4b\u540e\u53d1\u751f\u7684\u65b0\u5185\u5bb9\u5e7b\u89c9&#xff1a;\u9047\u5230\u77e5\u8bc6\u76f2\u533a\u4e0d\u4f1a\u5982\u5b9e\u56de\u590d\\&#8221;\u6211\u4e0d\u77e5\u9053\\&#8221;&#xff0c;\u800c\u662f\u5f3a\u884c\u7f16\u9020\u65e0\u6cd5\u8bc6\u522b\u79c1\u6709\u77e5\u8bc6&#xff1a;\u5185\u90e8\u6587\u6863\u3001\u4ee3\u7801\u5e93\u3001\u4e1a\u52a1\u89c4\u5219\u4e0d\u4f1a\u51fa\u73b0\u5728\u516c\u5f00\u8bad\u7ec3\u6570\u636e\u4e2d<br \/>\nRA<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[9097,81,50,207],"topic":[],"class_list":["post-87481","post","type-post","status-publish","format-standard","hentry","category-server","tag-9097","tag-python","tag-50","tag-207"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>RAG\u6838\u5fc3\u539f\u7406 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/87481.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RAG\u6838\u5fc3\u539f\u7406 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"RAG \u6838\u5fc3\u539f\u7406\u8be6\u89e3&#xff1a;\u4ece Embedding \u5230 HNSW \u518d\u5230\u5b8c\u6574\u68c0\u7d22\u94fe\u8def 1. \u4e3a\u4ec0\u4e48\u9700\u8981 RAG\u2014\u2014LLM \u7684\u5148\u5929\u5c40\u9650 \u5927\u8bed\u8a00\u6a21\u578b&#xff08;LLM&#xff09;\u5b58\u5728\u4e09\u4e2a\u6838\u5fc3\u7f3a\u9677&#xff1a; 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