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1.2 \u63a8\u8350\u7b97\u6cd5\u57fa\u672c\u6a21\u5757<\/h1>\n\n\n\n
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\u6df7\u6392<\/strong>\uff1a\u591a\u4e2a\u4e1a\u52a1\u7ebf\u90fd\u60f3\u5728 Feeds \u6d41\u4e2d\u83b7\u53d6\u66dd\u5149\uff0c\u5219\u9700\u8981\u5bf9\u5b83\u4eec\u7684\u7ed3\u679c\u8fdb\u884c\u6df7\u6392\u3002\u6bd4\u5982\u63a8\u8350\u6d41\u4e2d\u63d2\u5165\u5e7f\u544a\u3001\u89c6\u9891\u6d41\u4e2d\u63d2\u5165\u56fe\u6587\u548c banner \u7b49\u3002\u53ef\u4ee5\u57fa\u4e8e\u89c4\u5219\u7b56\u7565\uff08\u5982\u5e7f\u544a\u5b9a\u5751\uff09\u548c\u5f3a\u5316\u5b66\u4e60\u6765\u5b9e\u73b0\u3002<\/li><\/ol>\n\n\n\n
$\"\u8d85\u5f3a\u6307\u5357\uff01\u63a8\u8350\u7b97\u6cd5\u67b6\u6784\uff1a\u53ec\u56de\"\/$ <\/figure>\n\n\n\n
\u63a8\u8350\u7cfb\u7edf\u5305\u542b\u6a21\u5757\u5f88\u591a\uff0c\u8bba\u6587\u4e5f\u662f\u5c42\u51fa\u4e0d\u7a77\uff0c\u76f8\u5bf9\u6765\u8bf4\u8fd8\u662f\u5341\u5206\u590d\u6742\u7684\u3002\u6211\u4eec\u638c\u63e1\u63a8\u8350\u7cfb\u7edf\u7b97\u6cd5\u6700\u91cd\u8981\u7684\u8fd8\u662f\u8981\u68b3\u7406\u6e05\u695a\u6574\u4e2a\u7b97\u6cd5\u67b6\u6784\u548c\u5927\u56fe\uff0c\u77e5\u9053\u6bcf\u4e2a\u6a21\u5757\u662f\u600e\u4e48\u505a\u7684\uff0c\u6709\u54ea\u4e9b\u5c40\u9650\u6027\u548c\u5f85\u89e3\u51b3\u95ee\u9898\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ec0\u4e48\u624b\u6bb5\u4f18\u5316\u7b49\u3002\u5e76\u901a\u8fc7\u7b97\u6cd5\u67b6\u6784\u5927\u56fe\u5c06\u5404\u4e2a\u6a21\u5757\u8054\u7cfb\u8d77\u6765\uff0c\u878d\u4f1a\u8d2f\u901a\u3002\u4ece\u800c\u4e0d\u81f3\u4e8e\u6df1\u9677\u67d0\u4e2a\u7ec6\u8282\uff0c\u4e0d\u80fd\u81ea\u62d4\u3002\u770b\u8bba\u6587\u7684\u65f6\u5019\u4e5f\u5e94\u8be5\u5148\u4e86\u89e3\u5b83\u662f\u4e3a\u4e86\u89e3\u51b3\u4ec0\u4e48\u95ee\u9898\uff0c\u4e4b\u524d\u5df2\u7ecf\u6709\u54ea\u4e9b\u89e3\u51b3\u65b9\u6848\uff0c\u518d\u53bb\u4e86\u89e3\u5b83\u600e\u4e48\u89e3\u51b3\u7684\uff0c\u4ee5\u53ca\u76f8\u6bd4\u5176\u4ed6\u65b9\u6848\u6709\u4ec0\u4e48\u6539\u8fdb\u548c\u4f18\u5316\u70b9\u3002\u672c\u6587\u4e3b\u8981\u8bb2\u89e3\u63a8\u8350\u7b97\u6cd5\u67b6\u6784\u5927\u56fe\uff0c\u5e2e\u52a9\u8bfb\u8005\u638c\u63e1\u5168\u5c40\uff0c\u8d77\u5230\u63d0\u7eb2\u6308\u9886\u4f5c\u7528\u3002<\/p>\n\n\n\n
2 \u53ec\u56de<\/h1>\n\n\n\n
$\"\u8d85\u5f3a\u6307\u5357\uff01\u63a8\u8350\u7b97\u6cd5\u67b6\u6784\uff1a\u53ec\u56de\"\/$ <\/figure>\n\n\n\n
2.1 \u591a\u8def\u53ec\u56de<\/h1>\n\n\n\n
\u53ec\u56de\u6a21\u5757\u9762\u5bf9\u51e0\u767e\u4e0a\u5343\u4e07\u7684\u63a8\u8350\u6c60\u7269\u6599\u89c4\u6a21\uff0c\u5019\u9009\u96c6\u5341\u5206\u5e9e\u5927\u3002\u7531\u4e8e\u540e\u7eed\u6709\u6392\u5e8f\u6a21\u5757\u4f5c\u4e3a\u4fdd\u969c\uff0c\u6545\u4e0d\u9700\u8981\u5341\u5206\u51c6\u786e\uff0c\u4f46\u5fc5\u987b\u4fdd\u8bc1\u4e0d\u8981\u9057\u6f0f\u548c\u4f4e\u5ef6\u8fdf\u3002\u76ee\u524d\u4e3b\u8981\u901a\u8fc7\u591a\u8def\u53ec\u56de\u6765\u5b9e\u73b0\uff0c\u4e00\u65b9\u9762\u5404\u8def\u53ef\u4ee5\u5e76\u884c\u8ba1\u7b97\uff0c\u53e6\u4e00\u65b9\u9762\u53d6\u957f\u8865\u77ed\u3002\u53ec\u56de\u901a\u8def\u4e3b\u8981\u6709\u975e\u4e2a\u6027\u5316\u548c\u4e2a\u6027\u5316\u4e24\u5927\u7c7b\u3002<\/p>\n\n\n\n
2.1.1 \u975e\u4e2a\u6027\u5316\u53ec\u56de<\/h1>\n\n\n\n
\u975e\u4e2a\u6027\u5316\u53ec\u56de\u4e0e\u7528\u6237\u65e0\u5173\uff0c\u53ef\u4ee5\u79bb\u7ebf\u6784\u5efa\u597d\uff0c\u4e3b\u8981\u6709<\/p>\n\n\n\n
\u70ed\u95e8\u53ec\u56de<\/strong>\uff1a\u6bd4\u5982\u8fd1 7 \u5929\u64ad\u653e vv \u6bd4\u8f83\u9ad8\u7684\u77ed\u89c6\u9891\uff0c\u53ef\u4ee5\u7ed3\u5408 CTR \u548c\u65f6\u95f4\u8870\u51cf\u505a\u5e73\u6ed1\uff0c\u5e76\u8fc7\u6ee4\u6389\u4eba\u5747\u65f6\u957f\u504f\u4f4e\u7684\u7591\u4f3c\u9a97\u70b9\u51fb item\u3002\u8fd8\u53ef\u4ee5\u9009\u62e9\u7528\u6237\u70b9\u8d5e\u591a\u3001\u597d\u8bc4\u591a\u7684 item \u7b49\u3002\u8fd9\u90e8\u5206\u4e3b\u8981\u57fa\u4e8e\u89c4\u5219\u5b9e\u73b0\u5373\u53ef\u3002\u7531\u4e8e\u70ed\u95e8 item \u5bb9\u6613\u5bfc\u81f4\u9a6c\u592a\u6548\u5e94\uff0c\u5982\u679c\u70ed\u95e8\u53ec\u56de\u5360\u6574\u4f53\u901a\u8def\u6bd4\u4f8b\u8fc7\u5927\uff0c\u53ef\u4ee5\u8003\u8651\u505a\u4e00\u5b9a\u6253\u538b\u3002<\/li>
\u9ad8\u6548\u7387\u53ec\u56de<\/strong>\uff1a\u6bd4\u5982\u9ad8 CTR\u3001\u9ad8\u5b8c\u64ad\u7387\u3001\u9ad8\u4eba\u5747\u65f6\u957f\u7684\u77ed\u89c6\u9891\uff0c\u8fd9\u7c7b item \u6548\u7387\u8f83\u9ad8\uff0c\u4f46\u53ef\u80fd\u4e0a\u67b6\u4e0d\u4e45\uff0c\u5386\u53f2\u64ad\u653e vv \u4e0d\u591a\uff0c\u597d\u8bc4\u4e5f\u9700\u8981\u65f6\u95f4\u79ef\u7d2f\uff0c\u6709\u53ef\u80fd\u4e0d\u5728\u70ed\u95e8\u53ec\u56de\u5185\u3002<\/li>
\u8fd0\u8425\u7b56\u7565\u53ec\u56de<\/strong>\uff1a\u4f8b\u5982\u8fd0\u8425\u6784\u5efa\u7684\u5404\u4e2a\u7c7b\u76ee\u7684\u699c\u5355\u3001\u7247\u5355\uff0c\u6700\u65b0\u4e0a\u67b6 item \u7b49\u3002<\/li><\/ol>\n\n\n\n
2.1.2 \u4e2a\u6027\u5316\u53ec\u56de<\/h1>\n\n\n\n
\u4e2a\u6027\u5316\u53ec\u56de\u4e0e\u7528\u6237\u76f8\u5173\uff0c\u5343\u4eba\u5343\u9762\uff0c\u6839\u636e\u6784\u5efa\u65b9\u5f0f\u4e3b\u8981\u6709<\/p>\n\n\n\n
content-based<\/strong>\uff1a\u57fa\u4e8e\u5185\u5bb9\uff0c\u53ef\u4ee5\u901a\u8fc7\u7528\u6237\u6807\u7b7e\uff0c\u6bd4\u5982\u65b0\u6ce8\u518c\u65f6\u586b\u5199\u7684\u559c\u6b22\u7684\u5bfc\u6f14\u3001\u6f14\u5458\u3001\u7c7b\u76ee\u7b49\u4fe1\u606f\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u7528\u6237\u5386\u53f2\u884c\u4e3a\u4f5c\u4e3a trigger\uff0c\u6765\u9009\u53d6\u4e0e\u4e4b\u5185\u5bb9\u76f8\u4f3c\u7684 item\u3002\u4e3b\u8981\u6709\uff1a
\u6807\u7b7e\u53ec\u56de\uff1a\u6bd4\u5982\u6f14\u5458\u3001\u5bfc\u6f14\u3001item \u6807\u7b7e tag\u3001\u7c7b\u76ee\u7b49\u3002<\/li>
\u77e5\u8bc6\u56fe\u8c31<\/li>
\u591a\u6a21\u6001\uff1a\u6bd4\u5982\u6807\u9898\u8bed\u4e49\u76f8\u4f3c\u7684 item\uff0c\u9996\u56fe\u76f8\u4f3c\u7684 item\uff0c\u89c6\u9891\u7406\u89e3\u76f8\u4f3c\u7684 item \u7b49<\/li><\/ol><\/li><\/ol>\n\n\n\n
\u4e00\u822c\u5148\u79bb\u7ebf\u6784\u5efa\u597d\u5012\u6392\u7d22\u5f15\uff0c\u5728\u7ebf\u4f7f\u7528\u65f6\u901a\u8fc7\u7528\u6237\u6807\u7b7e\u6216\u8005\u5386\u53f2\u884c\u4e3a item \u4f5c\u4e3a trigger\uff0c\u53d6\u51fa\u5bf9\u5e94\u5019\u9009\u5373\u53ef\u3002\u57fa\u4e8e\u5185\u5bb9\u6765\u6784\u5efa\u5012\u6392\u7d22\u5f15\uff0c\u4e0d\u9700\u8981 item \u6709\u4e30\u5bcc\u7684\u884c\u4e3a\uff0c\u5bf9\u51b7\u542f item \u6bd4\u8f83\u53cb\u597d\u3002<\/p>\n\n\n\n
behavior-based<\/strong>\uff1a\u57fa\u4e8e\u884c\u4e3a\uff0c\u4e3b\u8981\u662f userCF \u548c itemCF \u4e24\u79cd\uff0c\u90fd\u662f\u901a\u8fc7\u884c\u4e3a\u6765\u627e\u76f8\u4f3c\uff0c\u9700\u8981 user \u6216\u8005 item \u6709\u6bd4\u8f83\u4e30\u5bcc\u7684\u884c\u4e3a\u3002userCF \u5148\u627e\u5230\u4e0e user \u884c\u4e3a\u76f8\u4f3c\u7684 user\uff0c\u9009\u53d6\u4ed6\u4eec\u884c\u4e3a\u5e8f\u5217\u4e2d\u7684 item \u4f5c\u4e3a\u5019\u9009\u3002itemCF \u5219\u627e\u5230\u6bcf\u4e2a item \u88ab\u884c\u4e3a\u76f8\u4f3c\u7684\u5176\u4ed6 item\uff0c\u6784\u5efa\u5012\u6392\u7d22\u5f15\u3002\u6784\u5efa\u65b9\u5f0f\u4e3b\u8981\u6709 CF \u548c MF \u4e24\u5927\u7c7b\uff0cMF \u53c8\u79f0 model-based CF\uff0c\u5c31\u4e0d\u5177\u4f53\u5c55\u5f00\u4e86\u3002<\/li>
feature-based<\/strong>\uff1a\u57fa\u4e8e\u7279\u5f81\uff0c\u6bd4\u5982 user \u7684\u5e74\u9f84\u3001\u6027\u522b\u3001\u673a\u578b\u3001\u5730\u7406\u4f4d\u7f6e\u3001\u884c\u4e3a\u5e8f\u5217\u7b49\uff0citem \u7684\u4e0a\u67b6\u65f6\u95f4\u3001\u89c6\u9891\u65f6\u957f\u3001\u5386\u53f2\u7edf\u8ba1\u4fe1\u606f\u7b49\u3002\u57fa\u4e8e\u7279\u5f81\u7684\u53ec\u56de\u6784\u5efa\u65b9\u5f0f\uff0c\u4fe1\u606f\u5229\u7528\u6bd4\u8f83\u5145\u5206\uff0c\u6548\u679c\u4e00\u822c\u4e5f\u6bd4\u8f83\u597d\uff0c\u5bf9\u51b7\u542f\u4e5f\u6bd4\u8f83\u53cb\u597d\uff0c\u662f\u6700\u8fd1\u51e0\u5e74\u6765\u7684\u7814\u7a76\u91cd\u70b9\u3002\u53c8\u4e3b\u8981\u5206\u4e3a
\u7ebf\u6027\u6a21\u578b\uff1a\u6bd4\u5982 FM\u3001FFM \u7b49\uff0c\u5c31\u4e0d\u5177\u4f53\u5c55\u5f00\u4e86<\/li>
\u6df1\u5ea6\u6a21\u578b\uff1a\u6bd4\u5982\u57fa\u4e8e DNN \u7684 DSSM \u53cc\u5854\u3001youtubeDNN\uff08\u53c8\u53eb deepMatch\uff09\u3002\u57fa\u4e8e\u7528\u6237\u5e8f\u5217\u7684 Mind\u3002\u57fa\u4e8e GNN \u7684 graphSAGE \u7b49\u3002<\/li><\/ol><\/li><\/ol>\n\n\n\n
\u7ebf\u4e0a\u4f7f\u7528\u65f6\uff0c\u53ef\u4ee5\u6709\u4e24\u79cd\u65b9\u5f0f\uff1a<\/p>\n\n\n\n
\u5411\u91cf\u68c0\u7d22\uff1a\u901a\u8fc7\u751f\u6210\u7684 user embedding\uff0c\u91c7\u7528\u8fd1\u90bb\u641c\u7d22\uff0c\u5bfb\u627e\u4e0e\u4e4b\u76f8\u4f3c\u7684 item embedding\uff0c\u4ece\u800c\u627e\u5230\u5177\u4f53 item\u3002\u68c0\u7d22\u65b9\u5f0f\u6709\u54c8\u5e0c\u5206\u6876\u3001HNSW \u7b49\u591a\u79cd\u65b9\u6cd5<\/li>
i2i \u5012\u6392\u7d22\u5f15\uff1a\u901a\u8fc7 item embedding\uff0c\u627e\u5230\u4e0e\u672c item \u76f8\u4f3c\u7684\u5176\u4ed6 item\uff0c\u79bb\u7ebf\u6784\u5efa i2i \u7d22\u5f15\u3002\u7ebf\u4e0a\u4f7f\u7528\u65f6\uff0c\u901a\u8fc7\u7528\u6237\u5386\u53f2\u884c\u4e3a\u4e2d\u7684 item \u4f5c\u4e3a trigger\uff0c\u4ece\u5012\u6392\u7d22\u5f15\u4e2d\u627e\u5230\u5019\u9009\u96c6<\/li>
social-network<\/strong>\uff1a\u901a\u8fc7\u597d\u53cb\u70b9\u8d5e\u3001\u5173\u6ce8\u5173\u7cfb\u3001\u901a\u4fe1\u5f55\u5173\u7cfb\u7b49\uff0c\u627e\u5230\u793e\u4ea4\u94fe\u4e0a\u7684\u5176\u4ed6\u4eba\uff0c\u7136\u540e\u901a\u8fc7\u4ed6\u4eec\u6765\u53ec\u56de item\u3002\u539f\u5219\u5c31\u662f\u597d\u53cb\u559c\u6b22\u7684 item\uff0c\u5927\u6982\u7387\u4e5f\u4f1a\u559c\u6b22\uff0c\u7269\u4ee5\u7c7b\u805a\u4eba\u4ee5\u7fa4\u5206\u561b\u3002<\/li><\/ol>\n\n\n\n
2.2 \u53ec\u56de\u4f18\u5316<\/h1>\n\n\n\n
\u591a\u8def\u53ec\u56de\u7684\u5404\u901a\u8def\u4e3b\u8981\u5c31\u662f\u8fd9\u4e9b\uff0c\u90a3\u53ec\u56de\u4e2d\u4e3b\u8981\u6709\u54ea\u4e9b\u95ee\u9898\u5462\uff0c\u4e2a\u4eba\u8ba4\u4e3a\u4e3b\u8981\u6709<\/p>\n\n\n\n
\u8d1f\u6837\u672c\u6784\u5efa\u95ee\u9898<\/strong>\uff1a\u53ec\u56de\u662f\u6837\u672c\u7684\u827a\u672f\uff0c\u6392\u5e8f\u662f\u7279\u5f81\u7684\u827a\u672f\uff0c\u8fd9\u53e5\u8bdd\u8bf4\u7684\u5f88\u5bf9\u3002\u53ec\u56de\u6b63\u6837\u672c\u53ef\u4ee5\u9009\u62e9\u66dd\u5149\u70b9\u51fb\u7684\u6837\u672c\uff0c\u4f46\u8d1f\u6837\u672c\u600e\u4e48\u9009\u5462\uff1f\u9009\u62e9\u66dd\u5149\u672a\u70b9\u51fb\u7684\u6837\u672c\u5417\uff0c\u80af\u5b9a\u4e0d\u884c
\u66dd\u5149\u672a\u70b9\u51fb\u6837\u672c\uff0c\u80fd\u4ece\u5df2\u6709\u53ec\u56de\u3001\u7c97\u6392\u3001\u7cbe\u6392\u6a21\u5757\u4e2d\u7ade\u4e89\u51fa\u6765\uff0c\u8bf4\u660e\u5176 item \u8d28\u91cf\u548c\u76f8\u5173\u6027\u90fd\u8fd8\u662f\u4e0d\u9519\u7684\uff0c\u4f5c\u4e3a\u53ec\u56de\u8d1f\u6837\u672c\u80af\u5b9a\u4e0d\u5408\u9002<\/li>
SSB \u95ee\u9898\uff0c\u53ec\u56de\u9762\u5411\u7684\u5168\u4f53\u63a8\u8350\u6c60\uff0c\u4f46\u80fd\u5f97\u5230\u66dd\u5149\u7684 item \u53ea\u662f\u5176\u4e2d\u5f88\u5c0f\u7684\u5b50\u96c6\uff0c\u8fd9\u6837\u6784\u5efa\u8d1f\u6837\u672c\u4f1a\u5bfc\u81f4\u5341\u5206\u4e25\u91cd\u7684 SSB\uff08sample selection bias\uff09\u95ee\u9898\uff0c\u4f7f\u5f97\u6a21\u578b\u4e25\u91cd\u504f\u79bb\u5b9e\u9645<\/li><\/ol><\/li><\/ol>\n\n\n\n
\u57fa\u4e8e\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u63a8\u8350\u6c60\u4e2d\u968f\u673a\u9009\u62e9 item \u4f5c\u4e3a\u8d1f\u6837\u672c\uff0c\u4f46\u53c8\u4f1a\u6709\u4e00\u4e2a\u95ee\u9898\uff0c\u968f\u673a\u9009\u62e9\u7684 item\uff0c\u76f8\u5bf9\u4e8e\u6b63\u6837\u672c\u6765\u8bf4\uff0c\u4e00\u822c\u5f88\u5bb9\u6613\u533a\u5206\uff0c\u6240\u4ee5\u9700\u8981\u6709 hard negative sample \u6765\u523a\u6fc0\u548c\u63d0\u5347\u53ec\u56de\u6a21\u578b\u6548\u679c\u3002\u6784\u5efa hard negative sample\uff0c\u662f\u76ee\u524d\u53ec\u56de\u7814\u7a76\u4e2d\u6bd4\u8f83\u591a\u7684\u4e00\u4e2a\u65b9\u5411\uff0c\u4e3b\u8981\u6709\uff1a<\/p>\n\n\n\n
\u501f\u52a9\u7cbe\u6392\u6a21\u578b\uff1a\u6bd4\u5982\u9009\u53d6\u7cbe\u6392\u6253\u5206\u5904\u4e8e\u4e2d\u95f4\u4f4d\u7f6e\u7684 item\uff0c\u5982\u6392\u540d 100~500 \u5de6\u53f3\u7684 item\uff0c\u5b83\u4eec\u4e0d\u662f\u5f88\u9760\u524d\uff0c\u53ef\u4ee5\u770b\u505a\u8d1f\u6837\u672c\uff0c\u4e5f\u4e0d\u662f\u540a\u8f66\u5c3e\uff0c\u4e0e\u6b63\u6837\u672c\u6709\u4e00\u5b9a\u76f8\u5173\u6027\uff0c\u533a\u5206\u8d77\u6765\u6709\u4e00\u5b9a\u96be\u5ea6\u3002<\/li>
\u4e1a\u52a1\u89c4\u5219\uff1a\u6bd4\u5982\u9009\u62e9\u540c\u7c7b\u76ee\u3001\u540c\u4ef7\u683c\u6863\u4f4d\u7b49\u89c4\u5219\u7684 item\uff0c\u53ef\u4ee5\u53c2\u8003 Airbnb \u8bba\u6587\u7684\u505a\u6cd5\u3002<\/li>
\u4e3b\u52a8\u5b66\u4e60\uff1a\u53ec\u56de\u7ed3\u679c\u8fdb\u884c\u4eba\u5de5\u5ba1\u6838\uff0cbad case \u4f5c\u4e3a\u8d1f\u6837\u672c<\/li><\/ol>\n\n\n\n
\u4e00\u822c\u4f1a\u5c06 hard negative \u4e0e easy negative\uff0c\u6309\u7167\u4e00\u5b9a\u6bd4\u4f8b\uff0c\u6bd4\u5982 1: 100\uff0c\u540c\u65f6\u4f5c\u4e3a\u53ec\u56de\u8d1f\u6837\u672c\u3002<\/p>\n\n\n\n
SSB \u95ee\u9898<\/strong>\uff1a\u53ec\u56de\u9762\u5411\u7684\u662f\u5168\u4f53\u63a8\u8350\u6c60\uff0citem \u6570\u91cf\u5de8\u5927\uff0c\u6545\u9700\u8981\u505a\u4e00\u5b9a\u7684\u8d1f\u91c7\u6837\uff0c\u6709\u6bd4\u8f83\u5927\u7684 SSB \u6837\u672c\u9009\u62e9\u504f\u5dee\u95ee\u9898\u3002\u6545\u9700\u8981\u8ba9\u9009\u62e9\u51fa\u6765\u7684\u8d1f\u6837\u672c\uff0c\u5c3d\u53ef\u80fd\u7684\u80fd\u4ee3\u8868\u5168\u4f53\u63a8\u8350\u6c60\uff0c\u4ece\u800c\u63d0\u5347\u6a21\u578b\u6cdb\u5316\u80fd\u529b\u3002\u4e3b\u8981\u95ee\u9898\u4ecd\u7136\u662f\u8d1f\u91c7\u6837\uff0c\u7279\u522b\u662f hard negative sample \u7684\u95ee\u9898\u3002<\/li>
\u76ee\u6807\u4e0d\u4e00\u81f4\u95ee\u9898<\/strong>\uff1a\u76ee\u524d\u7684\u53ec\u56de\u76ee\u6807\u4ecd\u7136\u662f\u627e\u76f8\u4f3c\uff0c\u4e0d\u8bba\u662f\u57fa\u4e8e\u5185\u5bb9\u7684\uff0c\u8fd8\u662f\u57fa\u4e8e\u884c\u4e3a\u548c\u7279\u5f81\u7684\u3002\u4f46\u7cbe\u6392\u548c\u6700\u7ec8\u5b9e\u9645\u4e1a\u52a1\u6307\u6807\u4ecd\u7136\u770b\u7684\u662f\u8f6c\u5316\uff0c\u76f8\u4f3c\u4e0d\u4ee3\u8868\u5c31\u80fd\u5f97\u5230\u5f88\u597d\u7684\u8f6c\u5316\uff0c\u6bd4\u5982\u6781\u7aef\u60c5\u51b5\uff0c\u5168\u90e8\u53ec\u56de\u4e0e\u7528\u6237\u6700\u8fd1\u64ad\u653e\u76f8\u4f3c\u7684\u77ed\u89c6\u9891\uff0c\u663e\u7136\u6700\u7ec8\u6574\u4f53\u7684\u8f6c\u5316\u662f\u4e0d\u9ad8\u7684\u3002<\/li>
\u7ade\u4e89\u95ee\u9898<\/strong>\uff1a\u5404\u53ec\u56de\u901a\u8def\u6700\u7ec8\u4f1a\u505a merge \u53bb\u91cd\uff0c\u5404\u901a\u9053\u4e4b\u95f4\u91cd\u590d\u5ea6\u8fc7\u9ad8\u5219\u6ca1\u6709\u610f\u4e49\uff0c\u7279\u522b\u662f\u65b0\u589e\u53ec\u56de\u901a\u8def\uff0c\u9700\u8981\u5bf9\u5386\u53f2\u901a\u8def\u6709\u8f83\u597d\u7684\u8865\u5145\u589e\u76ca\u4f5c\u7528\uff0c\u5404\u53ec\u56de\u901a\u8def\u4e4b\u95f4\u5b58\u5728\u4e00\u5b9a\u7684\u91cd\u53e0\u548c\u7ade\u4e89\u95ee\u9898\u3002\u540c\u65f6\uff0c\u53ec\u56de\u901a\u8def\u7684\u5019\u9009 item\uff0c\u4e0d\u4e00\u5b9a\u80fd\u5728\u7cbe\u6392\u4e2d\u7ade\u4e89\u900f\u51fa\uff0c\u7279\u522b\u662f\u5386\u53f2\u53ec\u56de\u5c11\u7684 item\uff0c\u7531\u4e8e\u5176\u66dd\u5149\u6837\u672c\u5f88\u5c11\uff0c\u7cbe\u6392\u4e2d\u6253\u5206\u4e0d\u9ad8\uff0c\u6240\u4ee5\u4e0d\u4e00\u5b9a\u80fd\u900f\u51fa\u3002\u53ec\u56de\u548c\u7cbe\u6392\u7684\u76f8\u7231\u76f8\u6740\uff0c\u8fd8\u9700\u8981\u901a\u8fc7\u5168\u94fe\u8def\u4f18\u5316\u6765\u7f13\u89e3\u3002<\/li><\/ol>\n","protected":false},"excerpt":{"rendered":"
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