{"id":9447,"date":"2025-10-30T14:33:56","date_gmt":"2025-10-30T06:33:56","guid":{"rendered":"\/?p=9447"},"modified":"2025-10-30T14:37:24","modified_gmt":"2025-10-30T06:37:24","slug":"rag-%e7%9a%84%e6%a3%80%e7%b4%a2%e6%a8%a1%e5%9d%97%e6%98%af%e6%80%8e%e4%b9%88%e4%bc%98%e5%8c%96%e7%9a%84%ef%bc%9f","status":"publish","type":"post","link":"\/?p=9447","title":{"rendered":"RAG \u7684\u68c0\u7d22\u6a21\u5757\u662f\u600e\u4e48\u4f18\u5316\u7684\uff1f"},"content":{"rendered":"<p>\u5728\u4e0a\u4e00\u7bc7\u91cc\u6211\u4eec\u804a\u4e86\u77e5\u8bc6\u5e93\u6784\u5efa\uff0c\u8fd9\u4e00\u7bc7\uff0c\u54b1\u4eec\u63a5\u7740\u8bb2 RAG \u7684\u7b2c\u4e8c\u4e2a\u7075\u9b42\u6a21\u5757\u2014\u2014<strong>\u5728\u7ebf\u68c0\u7d22\uff08Retrieval\uff09<\/strong>\u3002<\/p>\n<p>\u8fd9\u662f\u5f88\u591a\u5019\u9009\u4eba\u5728\u9762\u8bd5\u65f6\u6389\u5206\u7684\u5730\u65b9\u3002 \u5927\u591a\u6570\u4eba\u80fd\u8bf4\u51fa\u201c\u6211\u7528\u4e86\u5411\u91cf\u68c0\u7d22\u201d\uff0c\u4f46\u4e00\u8ffd\u95ee\uff1a<\/p>\n<blockquote>\n<p>\u201c\u4e3a\u4ec0\u4e48\u4e0d\u7528BM25\uff1f\u4e3a\u4ec0\u4e48\u8981\u505a\u91cd\u6392\uff1fTop K\u600e\u4e48\u8c03\uff1f\u201d<\/p>\n<\/blockquote>\n<p>\u7acb\u523b\u5c31\u9732\u602f\u4e86\u3002<\/p>\n<p>\u5982\u679c\u4f60\u80fd\u8bb2\u6e05\u695a\u68c0\u7d22\u6a21\u5757\u7684\u8bbe\u8ba1\u903b\u8f91\u3001\u4f18\u5316\u65b9\u5411\u548c\u5de5\u7a0b\u6743\u8861\uff0c \u90a3\u4f60\u5728\u9762\u8bd5\u91cc\u5df2\u7ecf\u9886\u514890%\u7684\u5019\u9009\u4eba\u3002<\/p>\n<h2>\u4e00\u3001\u68c0\u7d22\u6a21\u5757\u5728RAG\u4e2d\u7684\u89d2\u8272<\/h2>\n<p>RAG \u7684\u7ed3\u6784\u5f88\u50cf\u201c\u641c\u7d22\u5f15\u64ce + \u8bed\u8a00\u6a21\u578b\u201d\u7684\u7ec4\u5408\uff0c \u77e5\u8bc6\u5e93\u6784\u5efa\u662f\u94fa\u5730\u57fa\uff0c\u68c0\u7d22\u6a21\u5757\u5c31\u662f\u201c\u641c\u7d22\u5f15\u64ce\u201d\u90e8\u5206\u3002<\/p>\n<p>\u5b83\u7684\u76ee\u6807\u662f\uff1a<strong>\u5728\u6d77\u91cf\u6587\u6863\u4e2d\uff0c\u5feb\u901f\u51c6\u786e\u5730\u627e\u5230\u6700\u76f8\u5173\u7684\u5185\u5bb9\u7247\u6bb5\u3002<\/strong><\/p>\n<p>\u68c0\u7d22\u4e0d\u51c6\uff0c\u6a21\u578b\u201c\u7b54\u975e\u6240\u95ee\u201d\uff1b<\/p>\n<p>\u68c0\u7d22\u4e0d\u5168\uff0c\u6a21\u578b\u201c\u65e0\u8bdd\u53ef\u8bf4\u201d\u3002<\/p>\n<p>\u5f88\u591a\u4eba\u4ee5\u4e3a\u68c0\u7d22\u662f\u7b80\u5355\u7684\u201c\u5411\u91cf\u67e5\u76f8\u4f3c\u5ea6\u201d\uff0c \u5176\u5b9e\u5de5\u4e1a\u7ea7 RAG \u7684\u68c0\u7d22\u6a21\u5757\u662f\u4e00\u5957\u5b8c\u6574\u7684\u7ba1\u7ebf\uff1a<\/p>\n<ol>\n<li>Query \u5411\u91cf\u5316<\/li>\n<li>\u521d\u6b65\u53ec\u56de\uff08Recall\uff09<\/li>\n<li>\u7cbe\u6392\uff08Rerank\uff09<\/li>\n<li>\u7ed3\u679c\u8fc7\u6ee4\u4e0e\u5408\u5e76<\/li>\n<\/ol>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u9010\u6b65\u62c6\u5f00\u3002<\/p>\n<h2>\u4e8c\u3001\u7b2c\u4e00\u6b65\uff1aQuery \u5411\u91cf\u5316<\/h2>\n<p>\u7528\u6237\u8f93\u5165\u4e00\u53e5\u81ea\u7136\u8bed\u8a00\uff0c\u7cfb\u7edf\u8981\u5148\u628a\u5b83\u53d8\u6210\u53ef\u8ba1\u7b97\u7684\u5411\u91cf\u3002<\/p>\n<p>\u5173\u952e\u70b9\u6709\u4e09\uff1a<\/p>\n<ol>\n<li><strong>Embedding\u6a21\u578b\u4e00\u81f4\u6027<\/strong>\u68c0\u7d22Query\u5fc5\u987b\u7528\u548c\u77e5\u8bc6\u5e93\u76f8\u540c\u7684Embedding\u6a21\u578b\uff0c\u5426\u5219\u5411\u91cf\u7a7a\u95f4\u4e0d\u5bf9\u9f50\u3002<\/li>\n<li><strong>\u5f52\u4e00\u5316\u4e0e\u7ef4\u5ea6\u63a7\u5236<\/strong>\u901a\u5e38\u4f1a\u5bf9Query\u5411\u91cf\u505a\u5f52\u4e00\u5316\uff0c\u4fdd\u8bc1\u76f8\u4f3c\u5ea6\u8ba1\u7b97\u7a33\u5b9a\u3002 \u5411\u91cf\u7ef4\u5ea6\u592a\u9ad8\uff08\u6bd4\u59821024\uff09\u4f1a\u62d6\u6162\u68c0\u7d22\u901f\u5ea6\uff0c\u5de5\u7a0b\u4e0a\u4f1a\u505a\u964d\u7ef4\u6216\u91cf\u5316\u3002<\/li>\n<li><strong>\u4fdd\u7559\u5173\u952e\u8bcd\u7279\u5f81<\/strong>\u9664\u4e86\u8bed\u4e49\u5411\u91cf\uff0c\u8fd8\u53ef\u4ee5\u63d0\u53d6\u5173\u952e\u8bcd\u5907\u7528\uff0c\u4e3a\u540e\u7eedBM25\u6216\u6df7\u5408\u68c0\u7d22\u670d\u52a1\u3002<\/li>\n<\/ol>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff1a \u7528\u6237\u95ee\u201cRAG\u4f18\u5316\u6709\u54ea\u4e9b\u65b9\u5411\uff1f\u201d\uff0c Embedding\u8d1f\u8d23\u6355\u6349\u201c\u4f18\u5316\u201d\u4e0e\u201c\u6539\u8fdb\u201d\u8fd9\u79cd\u8bed\u4e49\u8fd1\u4e49\u5173\u7cfb\uff0c \u800c\u5173\u952e\u8bcd\u63d0\u53d6\u80fd\u786e\u4fdd\u201cRAG\u201d\u8fd9\u79cd\u4e13\u6709\u8bcd\u4e0d\u4f1a\u4e22\u3002<\/p>\n<h2>\u4e09\u3001\u7b2c\u4e8c\u6b65\uff1a\u53ec\u56de\u2014\u2014\u627e\u5f97\u5feb\uff0c\u8fd8\u8981\u627e\u5f97\u5168<\/h2>\n<p>\u53ec\u56de\u9636\u6bb5\u7684\u6838\u5fc3\u4efb\u52a1\u662f\u4ece\u6d77\u91cf\u5411\u91cf\u4e2d\u201c\u5feb\u901f\u627e\u5230Top K\u76f8\u4f3c\u7247\u6bb5\u201d\u3002<\/p>\n<p>\u4e3b\u6d41\u505a\u6cd5\u6709\u4e24\u79cd\uff1a<\/p>\n<h3><strong>1. \u5411\u91cf\u53ec\u56de\uff08Dense Retrieval\uff09<\/strong><\/h3>\n<p>\u57fa\u4e8eEmbedding\u7684\u8bed\u4e49\u76f8\u4f3c\u5ea6\u68c0\u7d22\u3002 \u5e38\u7528\u7b97\u6cd5\u6709 HNSW\u3001IVF\u3001PQ \u7b49\u8fd1\u4f3c\u6700\u8fd1\u90bb\uff08ANN\uff09\u7ed3\u6784\uff0c \u80fd\u5728\u767e\u4e07\u7ea7\u6587\u6863\u4e2d\u6beb\u79d2\u7ea7\u8fd4\u56de\u7ed3\u679c\u3002<\/p>\n<p>\u4f18\u70b9\u662f\u7406\u89e3\u8bed\u4e49\uff1b \u7f3a\u70b9\u662f\u6709\u65f6\u4e0d\u591f\u201c\u7cbe\u201d\uff0c\u6bd4\u5982\u5904\u7406\u6570\u5b57\u3001\u4ee3\u7801\u3001\u4e13\u6709\u540d\u8bcd\u65f6\u3002<\/p>\n<h3><strong>2. \u5173\u952e\u8bcd\u53ec\u56de\uff08Sparse Retrieval\uff09<\/strong><\/h3>\n<p>\u57fa\u4e8e\u4f20\u7edf\u641c\u7d22\u6280\u672f\uff0c\u5982BM25\u6216\u5012\u6392\u7d22\u5f15\u3002 \u4f18\u52bf\u662f\u7cbe\u786e\u5339\u914d\uff0c\u4f8b\u5982\u8bc6\u522b\u201cTCP\/IP\u534f\u8bae\u201d\u8fd9\u79cd\u77ed\u8bed\u3002<\/p>\n<p>\u5728\u5b9e\u8df5\u4e2d\uff0c\u6700\u5e38\u89c1\u7684\u4f18\u5316\u624b\u6bb5\u662f\u2014\u2014<strong>\u6df7\u5408\u68c0\u7d22\uff08Hybrid Search\uff09<\/strong>\uff1a \u201c\u5148\u7528Dense\u53ec\u56de\u8bed\u4e49\u76f8\u5173\u5185\u5bb9\uff0c\u518d\u7528BM25\u8865\u8db3\u7cbe\u786e\u5339\u914d\u3002\u201d<\/p>\n<p>\u4e24\u8005\u53d6\u5e76\u96c6\u6216\u52a0\u6743\u878d\u5408\uff0c \u65e2\u4fdd\u7559\u8bed\u4e49\u7406\u89e3\uff0c\u53c8\u4e0d\u6f0f\u5173\u952e\u672f\u8bed\u3002<\/p>\n<h2>\u56db\u3001\u7b2c\u4e09\u6b65\uff1a\u91cd\u6392\u2014\u2014\u4ece\u201c\u5dee\u4e0d\u591a\u201d\u5230\u201c\u6700\u76f8\u5173\u201d<\/h2>\n<p>\u53ec\u56de\u5f97\u5230\u51e0\u5341\u6761\u5019\u9009\u6587\u672c\uff0c\u8fd8\u4e0d\u80fd\u76f4\u63a5\u5582\u7ed9\u6a21\u578b\u3002 \u4e0b\u4e00\u6b65\u8981\u505a\u7684\uff0c\u5c31\u662f<strong>\u7cbe\u6392\uff08Rerank\uff09<\/strong>\u3002<\/p>\n<p>Reranker\u4e00\u822c\u662f\u4e00\u4e2a<strong>\u8de8\u6ce8\u610f\u529b\u6a21\u578b\uff08Cross-Encoder\uff09<\/strong>\uff0c \u5b83\u4f1a\u628a Query \u548c\u5019\u9009\u6587\u672c\u4e00\u8d77\u8f93\u5165\uff0c\u9010\u6761\u8ba1\u7b97\u76f8\u5173\u5ea6\u5206\u6570\u3002<\/p>\n<p>\u5178\u578b\u505a\u6cd5\uff1a<\/p>\n<ul>\n<li>\u53ec\u56de\u9636\u6bb5\u53d6 Top 50\uff1b<\/li>\n<li>Reranker\u6392\u5e8f\u540e\u53d6 Top 5~10\uff1b<\/li>\n<li>\u518d\u4ea4\u7ed9 LLM \u8fdb\u884c\u751f\u6210\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e00\u9636\u6bb5\u7684\u4f18\u5316\u91cd\u70b9\uff1a<\/p>\n<ul>\n<li>\u6a21\u578b\u9009\u578b\uff1abge-reranker\u3001monoBERT\u3001cohere reranker\uff1b<\/li>\n<li>\u4ee3\u4ef7\u6743\u8861\uff1aRerank\u8ba1\u7b97\u8d35\uff0c\u9700\u7f13\u5b58\u9ad8\u9891Query\uff1b<\/li>\n<li>\u9608\u503c\u8c03\u4f18\uff1a\u8bbe\u5b9a\u5408\u7406cutoff\u5206\u6570\uff0c\u9632\u6b62\u566a\u58f0\u5185\u5bb9\u6df7\u5165\u3002<\/li>\n<\/ul>\n<p>\u53ef\u4ee5\u7b80\u5355\u7406\u89e3\u4e3a\uff1a\u53ec\u56de\u662f\u201c\u627e\u5168\u201d\uff0c\u91cd\u6392\u662f\u201c\u6311\u597d\u201d\u3002<\/p>\n<h3><strong>\u4e94\u3001\u7b2c\u56db\u6b65\uff1a\u7ed3\u679c\u8fc7\u6ee4\u4e0e\u5408\u5e76<\/strong><\/h3>\n<p>\u5f97\u5230\u9ad8\u5206\u5019\u9009\u540e\uff0c\u8fd8\u8981\u505a\u6700\u540e\u4e00\u9053\u5173\u53e3\u2014\u2014\u8fc7\u6ee4\u3002<\/p>\n<p>\u5e38\u89c1\u505a\u6cd5\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u6309\u5143\u6570\u636e\u8fc7\u6ee4<\/strong>\uff1a \u6bd4\u5982\u53ea\u53d6\u6700\u8fd130\u5929\u5185\u5bb9\uff0c\u6216\u9650\u5b9a\u6765\u6e90\u4e3a\u201c\u6280\u672f\u6587\u6863\u201d\uff1b<\/li>\n<li><strong>\u53bb\u91cd<\/strong>\uff1a \u4e0d\u540c\u6587\u6863\u53ef\u80fd\u542b\u76f8\u540c\u7247\u6bb5\uff1b<\/li>\n<li><strong>\u591a\u5b50\u95ee\u9898\u5408\u5e76<\/strong>\uff1a \u5bf9\u590d\u6742Query\u53ef\u5206\u89e3\u4e3a\u591a\u4e2a\u5b50\u95ee\u9898\u5206\u522b\u68c0\u7d22\uff0c\u518d\u5408\u5e76\u7ed3\u679c\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e00\u6b65\u662fRAG\u5de5\u7a0b\u843d\u5730\u65f6\u5e38\u88ab\u5ffd\u7565\u7684\uff0c\u4f46\u5b83\u76f4\u63a5\u51b3\u5b9a\u7528\u6237\u4f53\u9a8c\u3002 \u5c24\u5176\u5728\u591a\u8f6e\u5bf9\u8bdd\u91cc\uff0c\u9519\u8bef\u8fc7\u6ee4\u4f1a\u5bfc\u81f4\u6a21\u578b\u201c\u8dd1\u9898\u201d\u3002<\/p>\n<h2>\u516d\u3001\u4f18\u5316\u7b56\u7565\u4e0e\u5e38\u89c1\u6311\u6218<\/h2>\n<h3><strong>1. \u5e73\u8861\u53ec\u56de\u7387\u4e0e\u7cbe\u786e\u7387<\/strong><\/h3>\n<p>Top K\u53d6\u592a\u5927\uff0c\u68c0\u7d22\u4f1a\u62d6\u6162\u3001\u5185\u5bb9\u592a\u6742\uff0c\u53d6\u592a\u5c0f\uff0c\u53c8\u5bb9\u6613\u6f0f\u6389\u5173\u952e\u4fe1\u606f\uff0c\u5efa\u8bae\u901a\u8fc7\u9a8c\u8bc1\u96c6\u8c03\u4f18\uff0c\u6bd4\u5982\u56fa\u5b9a\u751f\u6210\u8d28\u91cf\u7684\u524d\u63d0\u4e0b\uff0c\u5bfb\u627e\u6700\u4f73Top K\u3002<\/p>\n<h3><strong>2. \u964d\u4f4e\u68c0\u7d22\u5ef6\u8fdf<\/strong><\/h3>\n<p>\u53ef\u91c7\u7528\u4ee5\u4e0b\u624b\u6bb5\uff1a<\/p>\n<ul>\n<li>\u5411\u91cf\u5e93\u5206\u7247\u5e76\u884c\uff1b<\/li>\n<li>\u5411\u91cf\u91cf\u5316\uff1b<\/li>\n<li>\u7f13\u5b58\u9ad8\u9891Query\uff1b<\/li>\n<li>ANN\u7d22\u5f15\u53c2\u6570\u8c03\u4f18\uff08\u5982HNSW\u7684M\u3001efSearch\uff09\u3002<\/li>\n<\/ul>\n<h3><strong>3. \u57df\u5185\u4e13\u6709\u8bcd\u4f18\u5316<\/strong><\/h3>\n<p>\u5411\u91cf\u68c0\u7d22\u5f80\u5f80\u8bc6\u522b\u4e0d\u4e86\u51b7\u95e8\u672f\u8bed\u3002 \u53ef\u901a\u8fc7\uff1a<\/p>\n<ul>\n<li>\u9886\u57df\u5fae\u8c03Embedding\uff1b<\/li>\n<li>\u6784\u5efa\u540c\u4e49\u8bcd\u8868\uff1b<\/li>\n<li>\u5bf9\u7279\u5b9a\u5173\u952e\u8bcd\u5f3a\u5236BM25\u53ec\u56de\u3002<\/li>\n<\/ul>\n<h3><strong>4. \u591a\u8bed\u8a00\u4e0e\u8de8\u6a21\u6001<\/strong><\/h3>\n<p>\u5982\u679c\u7cfb\u7edf\u9700\u8981\u652f\u6301\u591a\u8bed\u8a00\u6587\u6863\uff0c\u53ef\u91c7\u7528\u591a\u8bedEmbedding\u6a21\u578b\uff08\u5982LaBSE\uff09\uff0c \u6216\u8005\u5728\u68c0\u7d22\u524d\u5148\u505a\u7ffb\u8bd1\u5f52\u4e00\u5316\u3002<\/p>\n<h3><strong>\u4e03\u3001\u5b9e\u6218\u6848\u4f8b\uff1a\u4e00\u6b21\u68c0\u7d22\u4f18\u5316\u7684\u6f14\u8fdb<\/strong><\/h3>\n<p>\u4ee5\u8bad\u7ec3\u8425\u505a\u7684\u4e00\u4e2a\u4f01\u4e1a\u77e5\u8bc6\u95ee\u7b54\u9879\u76ee\u4e3a\u4f8b\uff1a<\/p>\n<ul>\n<li>\u521d\u7248\u53ea\u7528Dense\u68c0\u7d22\uff0c\u53ec\u56de\u51c6\u786e\u7387\u7ea670%\uff1b<\/li>\n<li>\u540e\u6765\u52a0\u5165BM25\u6df7\u5408\u53ec\u56de\uff0c\u53ec\u56de\u7387\u63d0\u5347\u523085%\uff1b<\/li>\n<li>\u518d\u52a0Reranker\u6a21\u578b\uff0c\u6700\u7ec8\u7cbe\u786e\u7387\u63a5\u8fd190%\uff1b<\/li>\n<li>\u5f15\u5165\u7f13\u5b58\u673a\u5236\u540e\uff0c\u54cd\u5e94\u65f6\u95f4\u4ece2.1\u79d2\u964d\u52300.8\u79d2\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u5c31\u662f\u5178\u578b\u7684\u4ece\u201c\u80fd\u7528\u201d\u5230\u201c\u597d\u7528\u201d\u7684\u4f18\u5316\u8fc7\u7a0b\u3002<\/p>\n<h2>\u516b\u3001\u7b54\u9898\u6846\u67b6\u603b\u7ed3\uff08\u9762\u8bd5\u4e00\u5206\u949f\u7248\u672c\uff09<\/h2>\n<p>\u9762\u8bd5\u65f6\u53ef\u4ee5\u8fd9\u6837\u56de\u7b54\uff1a<\/p>\n<blockquote>\n<p>\u201cRAG 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