{"id":107,"date":"2026-06-06T12:22:45","date_gmt":"2026-06-06T12:22:45","guid":{"rendered":"https:\/\/blog.joezhou.top\/rlhf-dpo\/"},"modified":"2026-06-06T12:22:45","modified_gmt":"2026-06-06T12:22:45","slug":"rlhf-dpo","status":"publish","type":"post","link":"https:\/\/www.joezhou.top\/?p=107","title":{"rendered":"\u5927\u6a21\u578b\u5bf9\u9f50\u6280\u672f\uff1a\u4eceRLHF\u5230DPO\u7684\u6f14\u8fdb\u4e0e\u5b9e\u8df5"},"content":{"rendered":"<p>\u8981\u8ba9\u4e00\u4e2a\u8d85\u5927\u89c4\u6a21\u8bed\u8a00\u6a21\u578b\u771f\u6b63&#8221;\u542c\u8bdd&#8221;\uff0c\u4ec5\u9760\u9884\u8bad\u7ec3\u548c\u5fae\u8c03\u662f\u4e0d\u591f\u7684\u3002\u8fc7\u53bb\u4e24\u5e74\u91cc\uff0c\u5bf9\u9f50\uff08Alignment\uff09\u6280\u672f\u4ece\u5b66\u672f\u524d\u6cbf\u8d70\u5411\u4e86\u5de5\u7a0b\u5b9e\u8df5\uff0c\u6210\u4e3a\u5927\u6a21\u578b\u843d\u5730\u4e0d\u53ef\u6216\u7f3a\u7684\u5173\u952e\u73af\u8282\u3002\u672c\u6587\u5c06\u7cfb\u7edf\u68b3\u7406\u5927\u6a21\u578b\u5bf9\u9f50\u6280\u672f\u7684\u53d1\u5c55\u8109\u7edc\u2014\u2014\u4eceRLHF\u7684\u57fa\u7840\u6846\u67b6\u5230DPO\u7b49\u65b0\u8303\u5f0f\u7684\u7a81\u7834\uff0c\u5e76\u7ed3\u5408\u4f01\u4e1a\u5b9e\u8df5\u63a2\u8ba8\u5982\u4f55\u5728\u6210\u672c\u4e0e\u6548\u679c\u4e4b\u95f4\u53d6\u5f97\u5e73\u8861\u3002<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u9700\u8981\u5bf9\u9f50\uff1f<\/h2>\n<p>\u5927\u6a21\u578b\u5728\u9884\u8bad\u7ec3\u9636\u6bb5\u901a\u8fc7\u6d77\u91cf\u6587\u672c\u4e60\u5f97\u4e86\u5e7f\u6cdb\u7684\u77e5\u8bc6\uff0c\u4f46\u4e5f\u5438\u6536\u4e86\u5927\u91cf\u504f\u89c1\u3001\u6709\u5bb3\u5185\u5bb9\u548c\u4e0d\u826f\u8868\u8fbe\u3002\u66f4\u91cd\u8981\u7684\u662f\uff0c\u9884\u8bad\u7ec3\u6a21\u578b\u7684\u76ee\u6807\u662f\u9884\u6d4b\u4e0b\u4e00\u4e2atoken\uff0c\u800c\u975e&#8221;\u4ea7\u751f\u6709\u7528\u4e14\u5b89\u5168\u7684\u56de\u7b54&#8221;\u3002\u8fd9\u5c31\u5bfc\u81f4\u6a21\u578b\u5929\u7136\u5b58\u5728\u4e09\u4e2a\u5bf9\u9f50\u9e3f\u6c9f\uff1a<\/p>\n<ul>\n<li><strong>\u6709\u7528\u6027\u9e3f\u6c9f<\/strong>\uff1a\u6a21\u578b\u77e5\u9053\u7b54\u6848\uff0c\u4f46\u4e0d\u77e5\u9053\u5982\u4f55\u4ee5\u7528\u6237\u671f\u671b\u7684\u65b9\u5f0f\u8868\u8fbe<\/li>\n<li><strong>\u8bda\u5b9e\u6027\u9e3f\u6c9f<\/strong>\uff1a\u6a21\u578b\u53ef\u80fd\u81ea\u4fe1\u5730\u7ed9\u51fa\u9519\u8bef\u4fe1\u606f\uff08\u5e7b\u89c9\u95ee\u9898\uff09<\/li>\n<li><strong>\u5b89\u5168\u6027\u9e3f\u6c9f<\/strong>\uff1a\u6a21\u578b\u53ef\u80fd\u5728\u4e0d\u9002\u5b9c\u7684\u573a\u666f\u4e0b\u8f93\u51fa\u6709\u5bb3\u5185\u5bb9<\/li>\n<\/ul>\n<p>\u5bf9\u9f50\u6280\u672f\u8981\u89e3\u51b3\u7684\uff0c\u6070\u597d\u5c31\u662f\u8fd9\u4e09\u9053\u9e3f\u6c9f\u3002<\/p>\n<h2>RLHF\uff1a\u5960\u57fa\u6027\u7684\u4e09\u9636\u6bb5\u6846\u67b6<\/h2>\n<p>2022\u5e74\uff0cInstructGPT\u8bba\u6587\u9996\u6b21\u7cfb\u7edf\u9610\u8ff0\u4e86\u57fa\u4e8e\u4eba\u7c7b\u53cd\u9988\u7684\u5f3a\u5316\u5b66\u4e60\uff08RLHF\uff09\u6846\u67b6\uff0c\u8fd9\u4e2a\u6846\u67b6\u4e5f\u6210\u4e3aChatGPT\u7684\u6838\u5fc3\u6280\u672f\u57fa\u7840\u3002RLHF\u5305\u542b\u4e09\u4e2a\u7d27\u5bc6\u8854\u63a5\u7684\u9636\u6bb5\uff1a<\/p>\n<h3>\u7b2c\u4e00\u9636\u6bb5\uff1a\u6709\u76d1\u7763\u5fae\u8c03\uff08SFT\uff09<\/h3>\n<p>\u5728\u9ad8\u8d28\u91cf\u7684\u76d1\u7763\u6570\u636e\u4e0a\u5bf9\u9884\u8bad\u7ec3\u6a21\u578b\u8fdb\u884c\u5fae\u8c03\u3002\u8fd9\u4e9b\u6570\u636e\u901a\u5e38\u7531\u6807\u6ce8\u5458\u7f16\u5199\uff0c\u5305\u542b&#8221;\u6307\u4ee4-\u671f\u671b\u56de\u7b54&#8221;\u5bf9\u3002SFT\u9636\u6bb5\u7684\u76ee\u6807\u662f\u8ba9\u6a21\u578b\u5b66\u4f1a\u95ee\u7b54\u7684\u683c\u5f0f\u548c\u57fa\u672c\u98ce\u683c\uff0c\u76f8\u5f53\u4e8e\u7ed9\u6a21\u578b\u4e00\u672c&#8221;\u884c\u4e3a\u6307\u5357&#8221;\u3002<\/p>\n<p>SFT\u9636\u6bb5\u7684\u5173\u952e\u5728\u4e8e\u6570\u636e\u8d28\u91cf\u800c\u975e\u6570\u91cf\u3002\u7ecf\u9a8c\u6570\u636e\u8868\u660e\uff0c\u6570\u4e07\u5230\u6570\u5341\u4e07\u6761\u9ad8\u8d28\u91cfSFT\u6570\u636e\u7684\u6548\u679c\uff0c\u5f80\u5f80\u4f18\u4e8e\u767e\u4e07\u6761\u4f4e\u8d28\u91cf\u6570\u636e\u3002\u800c\u4e14SFT\u6570\u636e\u7684\u591a\u6837\u6027\u6bd4\u5355\u4e00\u9886\u57df\u7684\u6df1\u5ea6\u66f4\u91cd\u8981\uff0c\u56e0\u4e3a\u6a21\u578b\u9700\u8981\u5728\u5404\u79cd\u573a\u666f\u4e0b\u90fd\u80fd\u6b63\u786e\u54cd\u5e94\u3002<\/p>\n<h3>\u7b2c\u4e8c\u9636\u6bb5\uff1a\u5956\u52b1\u6a21\u578b\u8bad\u7ec3<\/h3>\n<p>\u5956\u52b1\u6a21\u578b\uff08Reward 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Policy 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Preference Optimization\uff09\u7ed5\u8fc7\u4e86\u663e\u5f0f\u7684\u5f3a\u5316\u5b66\u4e60\u8bad\u7ec3\uff0c\u901a\u8fc7\u6570\u5b66\u63a8\u5bfc\u5c06\u504f\u597d\u5b66\u4e60\u76f4\u63a5\u878d\u5165\u635f\u5931\u51fd\u6570\uff0c\u5927\u5e45\u964d\u4f4e\u4e86\u5bf9\u9f50\u8bad\u7ec3\u7684\u95e8\u69db\u3002<\/p>\n<p>DPO\u7684\u6838\u5fc3\u6d1e\u5bdf\u662f\uff1a\u6211\u4eec\u53ef\u4ee5\u5c06\u5f3a\u5316\u5b66\u4e60\u4e2d\u7684\u5956\u52b1\u51fd\u6570\u9690\u5f0f\u5730\u8868\u8fbe\u4e3a\u7b56\u7565\uff08\u6a21\u578b\uff09\u53c2\u6570\u7684\u51fd\u6570\uff0c\u4ece\u800c\u76f4\u63a5\u4f7f\u7528\u504f\u597d\u6570\u636e\u4f18\u5316\u7b56\u7565\uff0c\u65e0\u9700\u5355\u72ec\u8bad\u7ec3\u5956\u52b1\u6a21\u578b\u3002<\/p>\n<h3>DPO\u7684\u6280\u672f\u4f18\u52bf<\/h3>\n<ul>\n<li><strong>\u8bad\u7ec3\u6d41\u7a0b\u7b80\u5316<\/strong>\uff1a\u4eceRLHF\u7684\u4e09\u9636\u6bb5\u53d8\u4e3a\u4e24\u9636\u6bb5\uff08SFT + DPO\uff09<\/li>\n<li><strong>\u8d44\u6e90\u9700\u6c42\u964d\u4f4e<\/strong>\uff1a\u4e0d\u9700\u8981\u52a0\u8f7d\u5956\u52b1\u6a21\u578b\uff0c\u663e\u5b58\u5360\u7528\u51cf\u5c11\u7ea630-40%<\/li>\n<li><strong>\u8bad\u7ec3\u66f4\u7a33\u5b9a<\/strong>\uff1a\u907f\u514d\u4e86RL\u8bad\u7ec3\u4e2d\u7684\u8d85\u53c2\u6570\u654f\u611f\u95ee\u9898<\/li>\n<li><strong>\u6536\u655b\u66f4\u5feb<\/strong>\uff1a\u5728\u540c\u7b49\u6570\u636e\u91cf\u4e0b\uff0cDPO\u7684\u6536\u655b\u901f\u5ea6\u901a\u5e38\u4f18\u4e8ePPO<\/li>\n<\/ul>\n<h3>DPO\u7684\u5c40\u9650<\/h3>\n<p>DPO\u5e76\u975e\u4e07\u80fd\u89e3\u51b3\u65b9\u6848\u3002\u5b83\u5bf9\u6570\u636e\u8d28\u91cf\u7684\u8981\u6c42\u6bd4RLHF\u66f4\u9ad8\u2014\u2014\u504f\u597d\u6570\u636e\u7684\u8d28\u91cf\u76f4\u63a5\u51b3\u5b9a\u4e86\u5bf9\u9f50\u6548\u679c\u3002\u800c\u4e14DPO\u5728\u5904\u7406\u590d\u6742\u591a\u7ef4\u5ea6\u5bf9\u9f50\u76ee\u6807\u65f6\uff08\u540c\u65f6\u4f18\u5316\u6709\u7528\u6027\u548c\u5b89\u5168\u6027\uff09\uff0c\u4e0d\u5982RLHF\u7075\u6d3b\uff08RLHF\u53ef\u4ee5\u901a\u8fc7\u8bbe\u8ba1\u5956\u52b1\u51fd\u6570\u7684\u4e0d\u540c\u7ef4\u5ea6\u6765\u5e73\u8861\u591a\u76ee\u6807\uff09\u3002<\/p>\n<h2>\u4eceDPO\u5230\u66f4\u591a\u7684\u5bf9\u9f50\u53d8\u4f53<\/h2>\n<p>DPO\u7684\u63d0\u51fa\u6380\u8d77\u4e86\u4e00\u8f6e\u5bf9\u9f50\u6280\u672f\u7684\u521b\u65b0\u6d6a\u6f6e\uff0c\u884d\u751f\u51fa\u591a\u79cd\u53d8\u4f53\uff1a<\/p>\n<p><strong>IPO\uff08Identity Preference Optimization\uff09<\/strong>\uff1a\u9488\u5bf9DPO\u4e2d\u504f\u597d\u6570\u636e\u5206\u5e03\u4e0d\u5747\u8861\u7684\u95ee\u9898\uff0c\u5f15\u5165\u6b63\u5219\u5316\u9879\uff0c\u51cf\u5c11\u6a21\u578b\u5bf9\u7279\u5b9a\u6837\u672c\u7684\u8fc7\u62df\u5408\u3002<\/p>\n<p><strong>KTO\uff08Kahneman-Tversky Optimization\uff09<\/strong>\uff1a\u57fa\u4e8e\u884c\u4e3a\u7ecf\u6d4e\u5b66\u7684\u524d\u666f\u7406\u8bba\uff0c\u4e0d\u518d\u9700\u8981\u6210\u5bf9\u504f\u597d\u6570\u636e\uff0c\u53ea\u9700\u8981\u5355\u6761\u6570\u636e\u7684&#8221;\u597d\/\u574f&#8221;\u6807\u7b7e\uff0c\u5927\u5e45\u964d\u4f4e\u4e86\u6570\u636e\u6807\u6ce8\u6210\u672c\u3002<\/p>\n<p><strong>RRHF\uff08Rank Responses to align Human Feedback\uff09<\/strong>\uff1a\u5229\u7528\u6392\u540d\u635f\u5931\u800c\u975e\u5bf9\u6bd4\u635f\u5931\uff0c\u8ba9\u6a21\u578b\u76f4\u63a5\u5b66\u4e60\u6392\u540d\u4fe1\u606f\uff0c\u5728\u8bad\u7ec3\u6548\u7387\u548c\u7a33\u5b9a\u6027\u4e0a\u90fd\u6709\u63d0\u5347\u3002<\/p>\n<h2>\u4f01\u4e1a\u7ea7\u5bf9\u9f50\u5b9e\u8df5\u5efa\u8bae<\/h2>\n<h3>\u573a\u666f\u51b3\u5b9a\u7b56\u7565<\/h3>\n<p>\u4e0d\u662f\u6240\u6709\u573a\u666f\u90fd\u9700\u8981\u5b8c\u6574\u7684RLHF\u3002\u6211\u5efa\u8bae\u6839\u636e\u573a\u666f\u9700\u6c42\u6765\u5339\u914d\u5bf9\u9f50\u65b9\u6848\uff1a<\/p>\n<ul>\n<li><strong>\u901a\u7528\u5bf9\u8bdd\u52a9\u624b<\/strong>\uff1a\u63a8\u8350SFT + DPO\uff0c\u517c\u987e\u6548\u679c\u4e0e\u6210\u672c<\/li>\n<li><strong>\u5782\u76f4\u9886\u57df\u4e13\u5bb6<\/strong>\uff1a\u4f18\u5148\u505a\u597dSFT\u6570\u636e\u8d28\u91cf\uff0cDPO\u4f5c\u4e3a\u53ef\u9009\u589e\u5f3a<\/li>\n<li><strong>\u5b89\u5168\u654f\u611f\u573a\u666f<\/strong>\uff1a\u5efa\u8baeSFT + RLHF\uff0c\u5229\u7528\u591a\u7ef4\u5ea6\u5956\u52b1\u51fd\u6570\u7cbe\u7ec6\u5316\u63a7\u5236<\/li>\n<li><strong>\u4f4e\u6210\u672c\u5feb\u901f\u9a8c\u8bc1<\/strong>\uff1a\u4ec5SFT\u5373\u53ef\uff0c\u7528\u9ad8\u8d28\u91cf\u6570\u636e\u8dd1\u51fa\u57fa\u7ebf\u6548\u679c<\/li>\n<\/ul>\n<h3>\u6570\u636e\u8d28\u91cf\u4f18\u5148<\/h3>\n<p>\u65e0\u8bba\u9009\u62e9\u54ea\u79cd\u5bf9\u9f50\u65b9\u6848\uff0c\u6570\u636e\u8d28\u91cf\u59cb\u7ec8\u662f\u51b3\u5b9a\u56e0\u7d20\u3002\u6211\u89c1\u8fc7\u592a\u591a\u56e2\u961f\u5728\u7b97\u6cd5\u9009\u62e9\u4e0a\u7ea0\u7ed3\uff0c\u5374\u5728\u6570\u636e\u6807\u6ce8\u4e0a\u7c97\u653e\u5bf9\u5f85\u3002\u5efa\u8bae\u5728\u6570\u636e\u5de5\u4f5c\u4e2d\u6295\u5165\u81f3\u5c1170%\u7684\u7cbe\u529b\uff1a\u5236\u5b9a\u6e05\u6670\u7684\u6807\u6ce8\u51c6\u5219\u3001\u5efa\u7acb\u6807\u6ce8\u8d28\u68c0\u6d41\u7a0b\u3001\u5b9a\u671f\u6821\u51c6\u6807\u6ce8\u5458\u4e00\u81f4\u6027\u3002<\/p>\n<h3>\u8fed\u4ee3\u800c\u975e\u4e00\u8e74\u800c\u5c31<\/h3>\n<p>\u5bf9\u9f50\u662f\u4e00\u4e2a\u6301\u7eed\u8fed\u4ee3\u7684\u8fc7\u7a0b\u3002\u6a21\u578b\u4e0a\u7ebf\u540e\u4f1a\u6536\u5230\u5927\u91cf\u7528\u6237\u53cd\u9988\uff0c\u8fd9\u4e9b\u53cd\u9988\u53ef\u4ee5\u56de\u704c\u5230\u4e0b\u4e00\u8f6e\u5bf9\u9f50\u8bad\u7ec3\u4e2d\u3002\u5efa\u8bae\u5efa\u7acb&#8221;\u91c7\u96c6\u53cd\u9988\u2192\u5206\u6790\u6a21\u5f0f\u2192\u8865\u5145\u6570\u636e\u2192\u91cd\u65b0\u5bf9\u9f50\u2192\u4e0a\u7ebf\u9a8c\u8bc1&#8221;\u7684\u95ed\u73af\u6d41\u7a0b\u3002<\/p>\n<h2>\u672a\u6765\u8d8b\u52bf\u5c55\u671b<\/h2>\n<p>\u5bf9\u9f50\u6280\u672f\u6b63\u5728\u5feb\u901f\u6f14\u8fdb\u3002\u51e0\u4e2a\u503c\u5f97\u5173\u6ce8\u7684\u8d8b\u52bf\u5305\u62ec\uff1a<\/p>\n<p><strong>\u5728\u7ebf\u5bf9\u9f50<\/strong>\uff1a\u4ece\u9759\u6001\u6570\u636e\u96c6\u8bad\u7ec3\u8f6c\u5411\u57fa\u4e8e\u5b9e\u65f6\u4ea4\u4e92\u7684\u6301\u7eed\u5bf9\u9f50\uff0c\u8ba9\u6a21\u578b\u5728\u90e8\u7f72\u540e\u6301\u7eed\u4f18\u5316\u3002<\/p>\n<p><strong>\u591a\u6a21\u6001\u5bf9\u9f50<\/strong>\uff1a\u9762\u5bf9\u6587\u751f\u56fe\u3001\u6587\u751f\u89c6\u9891\u7b49\u751f\u6210\u4efb\u52a1\uff0c\u5bf9\u9f50\u76ee\u6807\u4ece\u6587\u672c\u8d28\u91cf\u6269\u5c55\u5230\u89c6\u89c9\u8d28\u91cf\u3001\u5ba1\u7f8e\u504f\u597d\u7b49\u7ef4\u5ea6\u3002<\/p>\n<p><strong>\u53ef\u6269\u5c55\u76d1\u7763<\/strong>\uff1a\u968f\u7740\u6a21\u578b\u80fd\u529b\u589e\u5f3a\uff0c\u4eba\u7c7b\u6807\u6ce8\u80fd\u529b\u51fa\u73b0\u74f6\u9888\uff08\u4eba\u7c7b\u65e0\u6cd5\u51c6\u786e\u5224\u65ad\u8d85\u4eba\u7c7b\u667a\u80fd\u6a21\u578b\u7684\u8f93\u51fa\u8d28\u91cf\uff09\u3002\u53ef\u6269\u5c55\u76d1\u7763\u7814\u7a76\uff08\u5982\u8fa9\u8bba\u3001\u8fc7\u7a0b\u5956\u52b1\u6a21\u578b\uff09\u53ef\u80fd\u6210\u4e3a\u7a81\u7834\u65b9\u5411\u3002<\/p>\n<p>\u5927\u6a21\u578b\u5bf9\u9f50\u4eceRLHF\u5230DPO\u7684\u6f14\u8fdb\uff0c\u672c\u8d28\u4e0a\u662f\u5bf9&#8221;\u5982\u4f55\u8ba9AI\u771f\u6b63\u670d\u52a1\u4eba\u7c7b&#8221;\u8fd9\u4e00\u95ee\u9898\u7684\u6301\u7eed\u63a2\u7d22\u3002\u6280\u672f\u4f1a\u4e0d\u65ad\u8fdb\u5316\uff0c\u4f46\u6838\u5fc3\u76ee\u6807\u59cb\u7ec8\u4e0d\u53d8\uff1a\u8ba9AI\u65e2\u6709\u80fd\u529b\uff0c\u53c8\u5b89\u5168\u53ef\u9760\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8981\u8ba9\u4e00\u4e2a\u8d85\u5927\u89c4\u6a21\u8bed\u8a00\u6a21\u578b\u771f\u6b63&#8221;\u542c\u8bdd&#8221;\uff0c\u4ec5\u9760\u9884\u8bad\u7ec3\u548c\u5fae\u8c03\u662f\u4e0d\u591f\u7684\u3002\u8fc7\u53bb\u4e24\u5e74\u91cc\uff0c\u5bf9\u9f50\uff08Al 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