{"id":25477,"date":"2025-03-06T19:44:12","date_gmt":"2025-03-06T11:44:12","guid":{"rendered":"http:\/\/139.9.1.231\/?p=25477"},"modified":"2025-06-17T14:26:12","modified_gmt":"2025-06-17T06:26:12","slug":"dpo-length-more-big","status":"publish","type":"post","link":"http:\/\/139.9.1.231\/index.php\/2025\/03\/06\/dpo-length-more-big\/","title":{"rendered":"DPO\u4e3a\u4ec0\u4e48\u4f1a\u8ba9\u5927\u8bed\u8a00\u6a21\u578b\u8f93\u51fa\u53d8\u957f"},"content":{"rendered":"\n<p>\u6458\u81ea\uff1a<a href=\"https:\/\/zhuanlan.zhihu.com\/p\/5830338806\">https:\/\/zhuanlan.zhihu.com\/p\/5830338806<\/a><\/p>\n\n\n\n<p class=\"has-light-pink-background-color has-background\"><strong>\u603b\u7684\u6765\u8bf4\uff0cDPO\u8ba9\u6a21\u578b\u8f93\u51fa\u53d8\u957f\u4e3b\u8981\u53ef\u4ee5\u5206\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u539f\u56e0\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"has-light-gray-background-color has-background\"><li><strong>RM\u548c\u6a21\u578b\u8bc4\u6d4b\u7684\u957f\u5ea6\u504f\u597d\u3002<\/strong>\u4e0d\u7ba1\u662fReward Model\u8fd8\u662f\u5f53\u524d\u7528\u4e0e\u8bc4\u6d4b\u7684\u6a21\u578b\uff08\u5373\u4fbf\u662fGPT4\uff09\u90fd\u4f1a\u5b58\u5728\u6bd4\u8f83\u660e\u663e\u7684\u957f\u5ea6\u504f\u597d\uff0c\u5373<strong>\u503e\u5411\u4e8e\u7ed9\u66f4\u957f\u7684\u56de\u7b54\u4e00\u4e2a\u66f4\u9ad8\u7684\u5206\u6570<\/strong>\u3002\u8fd9\u4e00\u70b9\u5df2\u7ecf\u6709\u975e\u5e38\u591a\u5de5\u4f5c\u7ed9\u51fa\u8fc7\u5206\u6790\u4e86\u3002<\/li><li><strong>\u8bad\u7ec3\u6570\u636e\u672c\u8eab\u957f\u5ea6\u5206\u5e03\u4e0d\u5747\u8861\u3002<\/strong>\u5b9e\u6218\u8fc7\u7a0b\u4e2d\u5f80\u5f80\u5c31\u662f\u7528RM\u8fdb\u884c\u6392\u5e8f\u6784\u9020\u8bad\u7ec3\u6570\u636e\uff0cRM\u7684\u957f\u5ea6\u504f\u597d\u5c31\u662f\u4f1a\u5bfc\u81f4\u8bad\u7ec3\u6570\u636e\u4e2d\u5bb9\u6613\u51fa\u73b0chosen\u6bd4rejected\u66f4\u957f\u7684\u60c5\u51b5\u3002\u8bad\u7ec3\u6570\u636e\u7684\u957f\u5ea6\u5dee\u5f02\uff08chosen\u6bd4rejected\u957f\uff09\u5c31\u4f1a\u5bfc\u81f4\u8bad\u7ec3\u540e\u6a21\u578b\u8f93\u51fa\u53d8\u957f\u3002<\/li><li><strong>\u6570\u636e\u957f\u5ea6\u5dee\u5f02\u5bfc\u81f4\u7684reward\u88ab\u9ad8\u4f30\u6216\u4f4e\u4f30\u3002<\/strong><a rel=\"noreferrer noopener\" href=\"https:\/\/link.zhihu.com\/?target=https%3A\/\/arxiv.org\/abs\/2406.10957\" target=\"_blank\">\u300aEliminating Biased Length Reliance of Direct Preference Optimization via Down-Sampled KL Divergence\u300b<\/a>\u4e2d\u53d1\u73b0\uff0cDPO\u7684\u7b97\u6cd5\u672c\u8eab\u4e5f\u5b58\u5728\u5bf9response\u957f\u5ea6\u7684\u4f9d\u8d56\uff0c<strong>chosen\u548crejected\u4e4b\u95f4\u7684\u957f\u5ea6\u5dee\u5f02\u53ef\u80fd\u4f1a\u5bfc\u81f4reward\u88ab\u9ad8\u4f30\/\u4f4e\u4f30\uff08overestimated or underestimated rewards\uff09<\/strong>\u3002\u5373\uff0c<strong>\u5f53chosen\u8fc7\u77ed\u65f6\uff0creward\u4f1a\u88ab\u4f4e\u4f30<\/strong>\uff0c\u800c<strong>\u5f53chosen\u8fc7\u957f\u65f6\uff0creward\u4f1a\u88ab\u9ad8\u4f30<\/strong>\u3002<\/li><li><strong>DPO\u7b97\u6cd5\u672c\u8eab\u7684\u957f\u5ea6\u654f\u611f\u6027\u3002<\/strong><a rel=\"noreferrer noopener\" href=\"https:\/\/link.zhihu.com\/?target=https%3A\/\/arxiv.org\/abs\/2409.06411\" target=\"_blank\">\u300aLength Desensitization in Direct Preference Optimization\u300b<\/a>\u4e2d\u63d0\u5230\uff0cresponse\u957f\u5ea6\u4f1a\u5f71\u54cd\u5230\u4f3c\u7136\u6982\u7387\u7684\u5927\u5c0f\uff0c\u5e76\u4e14\u8fdb\u4e00\u6b65\u5f71\u54cd\u5230\u8bad\u7ec3\u4f18\u5316\u65b9\u5411\uff1a<strong>\u5f53chosen\u66f4\u957f\u65f6\uff0cDPO\u4f1a\u5f80chosen\u7684\u65b9\u5411\u8fdb\u884c\u4f18\u5316\uff08\u589e\u5927chosen\u6982\u7387\uff09\uff0c\u4ece\u800c\u4f7f\u8f93\u51fa\u53d8\u957f\uff1b\u800crejected\u66f4\u957f\u65f6\uff0cDPO\u4f1a\u5f80\u8fdc\u79bbrejected\u7684\u65b9\u5411\u4f18\u5316\uff08\u964d\u4f4erejected\u6982\u7387\uff09\uff0c\u4f46\u5374\u672a\u5fc5\u4f1a\u8ba9\u8f93\u51fa\u53d8\u77ed\u3002<\/strong><\/li><\/ol>\n\n\n\n<p class=\"has-light-pink-background-color has-background\"><strong>\u5982\u4f55\u89e3\u51b3\uff1a<\/strong><\/p>\n\n\n\n<ol><li><strong>RM\u7684\u4f18\u5316<\/strong>\uff1a\u524d\u9762\u8bb2\u7684\u90fd\u662f\u5bf9DPO\u8fdb\u884c\u957f\u5ea6\u63a7\u5236\u7684\u5de5\u4f5c\uff0c\u4f46\u5bf9RM\u672c\u8eab\u7684\u957f\u5ea6\u504f\u597d\u8fdb\u884c\u4f18\u5316\u7684\u5de5\u4f5c\u6ca1\u6709\u770b\u5230\u592a\u591a\uff0c\u5982\u679c\u5927\u5bb6\u6709\u770b\u5230\u76f8\u5173\u7684\u4e5f\u53ef\u4ee5\u5728\u8bc4\u8bba\u533a\u63d0\u4f9b\u4e00\u4e0b\u3002\u5982\u679c\u5c06RM\u672c\u8eab\u7684\u957f\u5ea6\u504f\u597d\u95ee\u9898\u89e3\u51b3\u7684\u8bdd\uff0c\u90a3\u5c31\u53ef\u4ee5\u6781\u5927\u7a0b\u5ea6\u4e0a\u89e3\u51b3\u8bad\u7ec3\u6570\u636e\u7684\u957f\u5ea6\u5206\u5e03\u5747\u8861\u95ee\u9898\u4e86\u3002<\/li><li><strong>\u6570\u636e\u7684\u4f18\u5316<\/strong>\uff1a\u6709\u4e9b\u5de5\u4f5c\u4f1a\u5728\u6570\u636e\u6784\u9020\u65f6\u5bf9\u957f\u5ea6\u8fdb\u884c\u7efc\u5408\u8003\u8651\uff0c\u5982\u5bf9RM\u6253\u5206\u8fdb\u884c\u957f\u5ea6\u5f52\u4e00\u540e\u518d\u6392\u5e8f\u3001\u91c7\u6837\u591a\u4e2a\u7b54\u6848\u8fdb\u884c\u6392\u5e8f\u65f6\u6839\u636e\u5747\u503c\u65b9\u5dee\u9650\u5236chosen\u7684\u957f\u5ea6\u7b49\uff0c\u901a\u8fc7\u8fd9\u4e9b\u65b9\u5f0f\u53ef\u4ee5\u51cf\u5c11\u957f\u5ea6\u5dee\u8ddd\u8fc7\u5927\u7684\u60c5\u51b5\u3002\u5982\u679c\u6570\u636e\u672c\u8eab\u7684\u957f\u5ea6\u5206\u5e03\u5747\u8861\u4e86\uff0c\u4e5f\u80fd\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u51cf\u7f13\u8fd9\u79cd\u95ee\u9898\u3002<\/li><li><strong>\u8bad\u7ec3\u7b97\u6cd5\u4e0a\u7684\u4f18\u5316<\/strong>\uff1a\u5982\u679c\u4eceLD-DPO\u7684\u5206\u6790\u4e0a\u770b\uff0c\u5373\u4fbf\u6570\u636e\u5206\u5e03\u6bd4\u8f83\u5747\u8861\uff0c\u53ea\u8981\u5b58\u5728\u957f\u5ea6\u5dee\u5f02\uff0cDPO\u672c\u8eab\u7684\u957f\u5ea6\u654f\u611f\u6027\u5c31\u662f\u4f1a\u5bfc\u81f4\u6a21\u578b\u8f93\u51fa\u53d8\u957f\uff0c\u56e0\u6b64\u53ef\u80fd\u8fd8\u662f\u9700\u8981\u4e00\u4e9b\u7b97\u6cd5\u5c42\u9762\u7684\u4f18\u5316\uff0c\u6bd4\u5982\u5728DPO\u9636\u6bb5\u52a0\u5165<a href=\"https:\/\/zhida.zhihu.com\/search?content_id=250188590&amp;content_type=Article&amp;match_order=1&amp;q=SFTloss&amp;zhida_source=entity\" target=\"_blank\" rel=\"noreferrer noopener\">SFTloss<\/a>\u5c31\u662f\u4e00\u79cd\u7b80\u5355\u6709\u6548\u7684\u65b9\u6cd5\uff0c\u5728\u5f88\u591a\u516c\u5f00\u7684\u5927\u6a21\u578b\u6280\u672f\u62a5\u544a\u4e2d\u4e5f\u90fd\u6709\u7528\u5230\u8be5\u65b9\u6cd5\u3002\u53e6\u5916R-DPO\u3001SamPO\u548cLD-DPO\u7684\u957f\u5ea6\u63a7\u5236\u6548\u679c\u90fd\u7b97\u662f\u6bd4\u8f83\u597d\u7684\u65b9\u6cd5\u3002<\/li><\/ol>\n\n\n\n<p><\/p>\n\n\n\n<p>DPO\u9762\u4e34\u7684\u4e00\u4e2a\u95ee\u9898\uff08\u51c6\u786e\u6765\u8bb2\u662f\u4e00\u79cd\u73b0\u8c61\uff09\u5c31\u662f\u4f1a\u8ba9\u5927\u6a21\u578b\u7684\u8f93\u51fa\u53d8\u957f\uff0c\u4e14\u591a\u8f6eDPO\u7684\u8bdd\u4f1a\u8ba9\u6a21\u578b\u8f93\u51fa\u8d8a\u6765\u8d8a\u957f\u3002\u672c\u7bc7\u6587\u7ae0\u6211\u4eec\u5c06\u7ed3\u5408\u641c\u96c6\u5230\u7684\u4e00\u4e9b\u76f8\u5173\u5de5\u4f5c\uff0c\u63a2\u8ba8\u4e00\u4e0b\u4e1a\u754c\u5bf9\u8be5\u73b0\u8c61\u7684\u4e00\u4e9b\u5206\u6790\uff0c\u63a2\u7a76\u8fd9\u4e00\u73b0\u8c61\u4ea7\u751f\u7684\u6839\u672c\u539f\u56e0\uff0c\u4ee5\u53ca\u5982\u4f55\u6709\u6548\u5730\u89e3\u51b3\u3002<\/p>\n\n\n\n<p>\u9996\u5148\u6211\u4eec\u9700\u8981\u601d\u8003\u4e00\u4e2a\u95ee\u9898\uff0c<strong>\u6a21\u578b\u8f93\u51fa\u53d8\u957f\u5230\u5e95\u662f\u4e0d\u662f\u4e00\u4ef6\u574f\u4e8b\uff1f<\/strong>\u4e00\u822c\u6765\u8bf4\uff0c\u8f93\u51fa\u53d8\u957f\u53ef\u80fd\u4f1a\u4f7f\u5185\u5bb9\u66f4\u52a0\u8be6\u7ec6\uff0c\u4fe1\u606f\u91cf\u66f4\u4e30\u5bcc\uff0c\u56de\u590d\u8d28\u91cf\u66f4\u9ad8\uff0c\u7528\u6237\u4f53\u9a8c\u66f4\u597d\u3002\u4f46\u5982\u679c\u8fc7\u5ea6\u957f\uff0c\u8f93\u51fa\u4e86\u5f88\u591a\u5197\u4f59\u4fe1\u606f\uff0c\u56de\u590d\u8d28\u91cf\u6ca1\u6709\u660e\u663e\u6539\u5584\uff0c\u53cd\u800c\u5e26\u6765\u4e86\u63a8\u7406\u6210\u672c\u7684\u589e\u52a0\uff0c\u56de\u590d\u53d8\u5f97\u5570\u55e6\uff0c\u7528\u6237\u4f53\u9a8c\u53cd\u800c\u53d8\u5dee\u4e86\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u65e0\u8bba\u662f\u4ece\u7528\u6237\u4f53\u9a8c\u7684\u89d2\u5ea6\u8fd8\u662f\u591a\u8f6eDPO\u80fd\u5426run\u4e0b\u53bb\u7684\u89d2\u5ea6\uff0c\u505a\u597d\u957f\u5ea6\u63a7\u5236\u90fd\u662f\u6709\u5fc5\u8981\u7684\u3002<\/p>\n\n\n\n<h2>\u76f8\u5173\u5de5\u4f5c<\/h2>\n\n\n\n<p>\u5148\u7b80\u8981\u4ecb\u7ecd\u4e00\u4e9b\u76f8\u5173\u5de5\u4f5c\uff0c\u7136\u540e\u540e\u9762\u8be6\u7ec6\u603b\u7ed3\u3002<\/p>\n\n\n\n<h3>1.\u300aDisentangling Length from Quality in Direct Preference Optimization\u300b\uff08\u7b80\u79f0R-DPO\uff09<\/h3>\n\n\n\n<p>\u5728\u8fd9\u4e4b\u524d\u7684\u4e00\u4e9bRL\u7684\u5de5\u4f5c\u4e5f\u6709\u5206\u6790\u8fc7\u957f\u5ea6\u7206\u70b8\u95ee\u9898\uff0c\u4f46\u8be5\u6587\u7ae0\u53ef\u80fd\u662f\u7b2c\u4e00\u4e2a\u63d0\u51faDPO\u7684\u957f\u5ea6\u7206\u70b8\u95ee\u9898\u7684\u3002<\/p>\n\n\n\n<p>\u6587\u7ae0\u4e2d\u53d1\u73b0\uff0c\u65e0\u8bba\u662fRL\u8bad\u7ec3\u4e2d\u4f7f\u7528\u7684Reward Model\u8fd8\u662f\u7528\u6765\u8bc4\u6d4b\u6a21\u578b\u6548\u679c\u7684\u6253\u5206\u6a21\u578b\uff08\u5982GPT-4\uff09\u90fd<strong>\u8868\u73b0\u51fa\u660e\u663e\u7684\u957f\u5ea6\u504f\u597d<\/strong>\uff0c\u5373\u4f1a\u7ed9\u66f4\u957f\u7684\u7b54\u6848\u4e00\u4e2a\u66f4\u9ad8\u7684\u5206\u6570\uff08\u5982\u4e0b\u56fe\uff09\u3002\u4e14\u5728\u4e00\u4e9b\u516c\u5f00\u7684DPO\u8bad\u7ec3\u6570\u636e\u96c6\u4e2d\uff0c<strong>chosen\u7684\u957f\u5ea6\u5f80\u5f80\u4f1a\u6bd4rejected\u66f4\u957f\uff0c\u800c\u8fd9\u53ef\u80fd\u5c31\u662fDPO\u540e\u7684\u6a21\u578b\u8f93\u51fa\u957f\u5ea6\u660e\u663e\u6bd4SFT\u6a21\u578b\u66f4\u957f\u7684\u539f\u56e0<\/strong>\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"759\" height=\"526\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-3.png\" alt=\"\" class=\"wp-image-25489\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-3.png 759w, http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-3-300x208.png 300w\" sizes=\"(max-width: 759px) 100vw, 759px\" \/><\/figure>\n\n\n\n<p>\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u8be5\u6587\u7ae0\u63d0\u51fa\u4e86\u4e00\u79cd\u957f\u5ea6\u6b63\u5219\u5316\u7684\u7b56\u7565\uff0c\u5373\u5728\u8ba1\u7b97loss\u7684\u65f6\u5019\u6dfb\u52a0\u4e00\u4e2a\u957f\u5ea6\u6b63\u5219\u9879\uff0c\u4ece\u800c\u907f\u514d\u6a21\u578b\u5bf9\u957f\u5ea6\u7684\u8fc7\u5ea6\u62df\u5408\uff0c\u516c\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-4.png\" alt=\"\" class=\"wp-image-25491\" width=\"579\" height=\"67\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-4.png 700w, http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-4-300x35.png 300w\" sizes=\"(max-width: 579px) 100vw, 579px\" \/><\/figure>\n\n\n\n<p>\u5176\u4e2d\u00a0|yw|\u00a0\u8868\u793achosen\u7684\u957f\u5ea6\uff0c\u00a0|yl|\u00a0\u8868\u793arejected\u7684\u957f\u5ea6\uff0c\u4ece\u516c\u5f0f\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0c<strong>\u5f53chosen\u4e0erejected\u7684\u957f\u5ea6\u5dee\u8ddd\u8d8a\u5927\uff0c\u6b63\u5219\u9879\u7684\u503c\u8d8a\u5927\uff0c\u4ece\u800c\u5b9e\u73b0\u5bf9\u957f\u5ea6\u7684\u201c\u60e9\u7f5a\u201d\u6548\u679c\u3002<\/strong><\/p>\n\n\n\n<p>\u4ece\u6587\u7ae0\u4e2d\u7684\u5b9e\u9a8c\u7ed3\u679c\u53ef\u4ee5\u770b\u51fa\uff0c\u8be5\u65b9\u6cd5\u786e\u5b9e\u53ef\u4ee5\u5728\u5c3d\u53ef\u80fd\u51cf\u5c11\u6027\u80fd\u635f\u5931\u7684\u524d\u63d0\u4e0b\u6709\u6548\u89e3\u51b3\u957f\u5ea6\u589e\u957f\u95ee\u9898\u3002\uff08\u6709\u65f6\u8fd8\u662f\u4f1a\u635f\u5931\u4e00\u5b9a\u7684\u6027\u80fd\u3002\uff09<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"778\" height=\"304\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-5.png\" alt=\"\" class=\"wp-image-25495\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-5.png 778w, http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-5-300x117.png 300w, http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-5-768x300.png 768w\" sizes=\"(max-width: 778px) 100vw, 778px\" \/><\/figure>\n\n\n\n<h3>2.<a href=\"https:\/\/link.zhihu.com\/?target=https%3A\/\/arxiv.org\/abs\/2405.14734\" target=\"_blank\" rel=\"noreferrer noopener\">\u300aSimPO: Simple Preference Optimization with a Reference-Free Reward\u300b<\/a>\uff08\u7b80\u79f0SimPO\uff09<\/h3>\n\n\n\n<p>\u9648\u4e39\u7426\u56e2\u961f\u7684\u5de5\u4f5c\uff0c\u76f4\u63a5\u53bb\u6389\u4e86reference model\uff0c\u7528\u957f\u5ea6\u5f52\u4e00\u7684\u65b9\u5f0f\u5b9e\u73b0\u957f\u5ea6\u63a7\u5236\u3002\u5176loss\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"744\" height=\"49\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-6.png\" alt=\"\" class=\"wp-image-25497\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-6.png 744w, http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-6-300x20.png 300w\" sizes=\"(max-width: 744px) 100vw, 744px\" \/><\/figure>\n\n\n\n<p>\u6587\u7ae0\u4e2d\u63d0\u5230\u4e86\u5f88\u591a\u8f93\u51fa\u957f\u5ea6\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u4f46\u6838\u5fc3\u8d21\u732e\u5e76\u4e0d\u662f\u505a\u957f\u5ea6\u63a7\u5236\uff0c\u800c\u662f\u7528\u4e00\u79cd\u66f4\u7b80\u5355\u9ad8\u6548\u7684\u65b9\u6cd5\u5b9e\u73b0\u504f\u597d\u8bad\u7ec3\u3002\u4ece\u516c\u5f0f\u4e0a\u770b\uff0c\u548c\u539f\u59cbDPOloss\u76f8\u6bd4\u4e3b\u8981\u6709\u4e24\u5904\u4e0d\u540c\uff0c\u4e00\u4e2a\u662f\u5206\u6bcd\u4ecereference model\u7684logp\u66ff\u6362\u6210\u4e86\u957f\u5ea6\uff0c\u53e6\u5916\u5c31\u662f\u589e\u52a0\u4e86\u4e00\u4e2a&nbsp;\u03b3&nbsp;\uff0c\u7c7b\u4f3c\u4e00\u4e2aoffset\u7684\u4f5c\u7528\u3002\u4e0d\u8fc7\u5176\u4e2d\u5bf9chosen\u548crejected\u7684reward\u505a\u957f\u5ea6\u5f52\u4e00\u7684\u90e8\u5206\uff0c\u76f4\u89c9\u4e0a\u770b\u8d77\u6765\u5e94\u8be5\u662f\u80fd\u8d77\u5230\u4e00\u5b9a\u7684\u957f\u5ea6\u63a7\u5236\u6548\u679c\u7684\u3002<\/p>\n\n\n\n<p>\u4e0d\u8fc7\u4ece\u8bba\u6587\u4e2d\u7684\u5b9e\u9a8c\u7ed3\u679c\u770b\uff0c\u8be5\u65b9\u6cd5\u7684\u6548\u679c\u8fd8\u662f\u6bd4\u8f83\u597d\u7684\uff08\u5f53\u65f6\u58f0\u79f0\u8bad\u51fa\u6700\u5f3a8B\u5927\u6a21\u578b\uff09\uff0c\u4f46\u4e0e\u6807\u51c6DPO\u76f8\u6bd4\u4f3c\u4e4e\u5e76\u6ca1\u6709\u5b9e\u73b0\u957f\u5ea6\u63a7\u5236\u7684\u6548\u679c\u3002<\/p>\n\n\n\n<h3>3.<a href=\"https:\/\/link.zhihu.com\/?target=https%3A\/\/arxiv.org\/abs\/2406.10957\" target=\"_blank\" rel=\"noreferrer noopener\">\u300aEliminating Biased Length Reliance of Direct Preference Optimization via Down-Sampled KL Divergence\u300b<\/a>\uff08\u7b80\u79f0<a href=\"https:\/\/zhida.zhihu.com\/search?content_id=250188590&amp;content_type=Article&amp;match_order=1&amp;q=SamPO&amp;zhida_source=entity\" target=\"_blank\" rel=\"noreferrer noopener\">SamPO<\/a>\uff09<\/h3>\n\n\n\n<p>\u8fd9\u7bc7\u8bba\u6587\u5bf9DPO\u540e\u957f\u5ea6\u53d8\u957f\u7684\u95ee\u9898\u8fdb\u884c\u4e86\u4e00\u5b9a\u7684\u5206\u6790\uff0c\u63d0\u51fa\u7684\u4e00\u4e2a\u6838\u5fc3\u89c2\u70b9\u662f\uff1aDPO\u7684\u7b97\u6cd5\u672c\u8eab\u4e5f\u5b58\u5728\u5bf9response\u957f\u5ea6\u7684\u4f9d\u8d56\uff0cchosen\u548crejected\u4e4b\u95f4\u7684\u957f\u5ea6\u5dee\u5f02\u53ef\u80fd\u4f1a\u5bfc\u81f4reward\u88ab\u9ad8\u4f30\/\u4f4e\u4f30\uff08overestimated or underestimated rewards\uff09\u3002\u5373\uff0c<strong>\u5f53chosen\u8fc7\u77ed\u65f6\uff0creward\u4f1a\u88ab\u4f4e\u4f30\uff0c\u800c\u5f53chosen\u8fc7\u957f\u65f6\uff0creward\u4f1a\u88ab\u9ad8\u4f30\u3002<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"765\" height=\"355\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-7.png\" alt=\"\" class=\"wp-image-25501\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-7.png 765w, http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-7-300x139.png 300w\" sizes=\"(max-width: 765px) 100vw, 765px\" \/><\/figure>\n\n\n\n<p>\u8fd9\u7bc7\u5de5\u4f5c\u4e2d\u63d0\u51fa\u7684\u4e00\u79cd\u65b9\u5f0f\u5c31\u662f\u5728token\u7ea7\u522b\u4e0b\u91c7\u6837\u7684\u6982\u7387\u7279\u5f81\uff0c\u4ee5\u8ba1\u7b97\u6b63\u5219\u5316\u7684KL\u6563\u5ea6\uff0c\u4ece\u800c\u51cf\u5c11\u56e0pair\u957f\u5ea6\u4e0d\u540c\u800c\u5bfc\u81f4\u7684\u5956\u52b1\u504f\u5dee\u3002\u5176loss\u7684\u8ba1\u7b97\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"634\" height=\"87\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-8.png\" alt=\"\" class=\"wp-image-25504\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-8.png 634w, http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-8-300x41.png 300w\" sizes=\"(max-width: 634px) 100vw, 634px\" \/><\/figure>\n\n\n\n<p>\u4ece\u516c\u5f0f\u53ef\u4ee5\u770b\u51fa\uff0c\u8be5\u65b9\u6cd5\u7684\u6838\u5fc3\u5c31\u662f\u5728\u8ba1\u7b97reward\u7684\u65f6\u5019\u4e0d\u518d\u662f\u5168\u90e8token\u7684\u6761\u4ef6\u6982\u7387\u7684\u7d2f\u4e58\uff08\u53d6log\u540e\u5c31\u662f\u7d2f\u52a0\uff09\uff0c\u800c\u662f\u968f\u673a\u91c7\u6837\u516c\u5171\u6570\u91cf\u7684token\u8fdb\u884c\u7d2f\u4e58\u3002\u8fd9\u6837\u5373\u4fbfchosen\u548crejected\u957f\u5ea6\u4e0d\u540c\uff0c\u53c2\u4e0ereward\u8ba1\u7b97\u7684token\u6570\u662f\u4e00\u6837\u7684\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728SamPO\u8bad\u7ec3\u8fc7\u7a0b\u4e2d\uff0c\u9b54\u90fd\u770b\u5230\u7684chosen\u548crejected\u76f8\u5f53\u4e8e\u662f\u5b8c\u5168\u7b49\u957f\u7684\u3002<\/p>\n\n\n\n<p>\u4ece\u6587\u7ae0\u4e2d\u7684\u5b9e\u9a8c\u7ed3\u679c\u770b\uff0c\u8be5\u65b9\u6cd5\u786e\u5b9e\u80fd\u6709\u6548\u63a7\u5236\u6a21\u578b\u8f93\u51fa\u957f\u5ea6\u7684\u589e\u957f\uff0c\u751a\u81f3\u5728\u591a\u8f6eDPO\u4f9d\u7136\u80fd\u6709\u6548\u63a7\u5236\u957f\u5ea6\u3002\u4f46\u662f\u5728\u6027\u80fd\u4e0a\u770b\u4f9d\u7136\u505a\u4e0d\u5230\u78be\u538b\u6807\u51c6DPO\u7684\u6548\u679c\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"760\" height=\"520\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-9.png\" alt=\"\" class=\"wp-image-25506\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-9.png 760w, http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-9-300x205.png 300w\" sizes=\"(max-width: 760px) 100vw, 760px\" \/><\/figure>\n\n\n\n<p>\u4f46\u8be5\u65b9\u6cd5\u6709\u4e24\u4e2a\u98ce\u9669\u4fbf\u662f\uff1a<\/p>\n\n\n\n<ol><li>\u672c\u8eabDPO\u5c31\u5b58\u5728\u4e00\u5b9a\u7684\u6ce2\u52a8\uff0c\u968f\u673a\u4e0b\u91c7\u6837\u53ef\u80fd\u4f1a\u5bfc\u81f4\u8bad\u7ec3\u7684\u7a33\u5b9a\u6027\u4e0d\u5f3a\uff1b<\/li><li>\u968f\u673a\u91c7\u6837\u5fc5\u7136\u4f1a\u5bfc\u81f4\u4e00\u4e9b\u4fe1\u606f\u7f3a\u5931\uff0c\u5982\u679c\u91c7\u6837\u65f6\u820d\u5f03\u6389\u4e86\u4e00\u4e9b\u975e\u5e38\u91cd\u8981\u7684token\u53ef\u80fd\u4f1a\u5f71\u54cd\u5230\u8bad\u7ec3\u6548\u679c\u3002<\/li><\/ol>\n\n\n\n<h3>4.<a rel=\"noreferrer noopener\" href=\"https:\/\/link.zhihu.com\/?target=https%3A\/\/arxiv.org\/abs\/2409.06411\" target=\"_blank\">\u300aLength Desensitization in Direct Preference Optimization\u300b<\/a>\uff08\u7b80\u79f0LD-DPO\uff09<\/h3>\n\n\n\n<p>\u8be5\u8bba\u6587\u53ef\u80fd\u662f\u7b2c\u4e00\u4e2a\u4ece\u7406\u8bba\u5c42\u9762\u5206\u6790DPO\u540e\u6a21\u578b\u8f93\u51fa\u53d8\u957f\u7684\u539f\u56e0\u7684\uff0c\u5176\u6838\u5fc3\u5206\u6790\u4e3b\u8981\u5305\u62ec\u4e24\u65b9\u9762\uff1a<\/p>\n\n\n\n<ol><li><strong>DPO\u7684\u68af\u5ea6\u4f18\u5316\u65b9\u5411\u548cchosen\/rejected\u7684\u4f3c\u7136\u6982\u7387\u6210\u53cd\u6bd4\u3002<\/strong><\/li><li><strong>Response\u957f\u5ea6\u5bf9\u4f3c\u7136\u6982\u7387\u7684\u5f71\u54cd\u6781\u5927\uff0c\u56e0\u6b64\u957f\u5ea6\u4f1a\u76f4\u63a5\u5f71\u54cdreward\u7684\u8ba1\u7b97\uff0c\u5e76\u5f71\u54cd\u5230DPO\u7684\u4f18\u5316\u65b9\u5411\u3002<\/strong><\/li><\/ol>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"765\" height=\"303\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-10.png\" alt=\"\" class=\"wp-image-25508\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-10.png 765w, http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-10-300x119.png 300w\" sizes=\"(max-width: 765px) 100vw, 765px\" \/><\/figure>\n\n\n\n<p>\u4e0a\u56fe\u662f\u4e00\u4e2a\u5bf9\u8bad\u7ec3\u6570\u636e\u7684\u7edf\u8ba1\u70ed\u529b\u56fe\uff0c\u56fe\u4e2d\uff0c\u6a2a\u5750\u6807\u4e3achosen\u7684\u957f\u5ea6\uff0c\u7eb5\u5750\u6807\u4e3arejected\u7684\u957f\u5ea6\uff0c\u989c\u8272\u6df1\u5ea6\u8868\u793a&nbsp;log\u2061\u03c0\u03b8(yl|x)\u2212log\u2061\u03c0\u03b8(yw|x)&nbsp;\u503c\u7684\u5927\u5c0f\u3002\u7b2c\u4e00\u5f20\u56fe(a)\u662f\u6807\u51c6DPO\uff0c\u53ef\u4ee5\u770b\u51fa\u957f\u5ea6\u5dee\u8ddd\u8d8a\u5927\u65f6\uff0c\u989c\u8272\u8d8a\u6df1\uff0c\u4e5f\u5c31\u8bf4\u660e\u957f\u5ea6\u5dee\u8ddd\u53ef\u80fd\u4f1a\u5bfc\u81f4reward\u8ba1\u7b97\u4ea7\u751fbias\uff0c\u4e14\u957f\u5ea6\u5dee\u8ddd\u8d8a\u5927\u8fd9\u79cdbias\u8d8a\u5927\u3002\u800c\u8fd9\u79cdbias\u4f1a\u8fdb\u4e00\u6b65\u5f71\u54cd\u5230DPO\u7684\u4f18\u5316\u65b9\u5411\uff0c\u4f7f\u5176\u5f80\u8f93\u51fa\u66f4\u957f\u7684\u65b9\u5411\u8fdb\u884c\u4f18\u5316\u3002<\/p>\n\n\n\n<p>\u8be5\u6587\u7ae0\u63d0\u51fa\u7684\u89e3\u51b3\u65b9\u6848\u662f\u5728\u8ba1\u7b97\u4f3c\u7136\u6982\u7387\u65f6\u5bf9\u957f\u5ea6\u8fdb\u884c\u89e3\u8026\uff0c\u5c06\u66f4\u957f\u7684\u7b54\u6848\u62c6\u6210\u201c\u516c\u5171\u957f\u5ea6\u90e8\u5206\u201d\u548c\u201c\u989d\u5916\u90e8\u5206\u201d\uff0c\u5e76\u8fdb\u4e00\u6b65\u5c06\u540e\u8005\u62c6\u5206\u4e3a\u771f\u5b9e\u504f\u597d\u548c\u5197\u4f59\u504f\u597d\uff0c\u5e76\u5bf9\u5176\u4e2d\u7684\u5197\u4f59\u90e8\u5206\u8fdb\u884c\u964d\u6743\u64cd\u4f5c\uff0c\u901a\u8fc7\u4e00\u7cfb\u5217\u63a8\u5bfc\u540e\u5c06\u00a0\u03c0\u03b8(y|x)\u00a0\u8f6c\u5316\u4e3a\u5982\u4e0b\u7684\u5f62\u5f0f\uff08\u53ef\u8fd1\u4f3c\u7406\u89e3\u4e3a\u5b8c\u6574\u4f3c\u7136\u6982\u7387\u90e8\u5206\u4e0e\u516c\u5171\u957f\u5ea6\u90e8\u5206\u4f3c\u7136\u6982\u7387\u7684\u52a0\u6743\u548c\uff09\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" width=\"492\" height=\"40\" src=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-11.png\" alt=\"\" class=\"wp-image-25509\" srcset=\"http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-11.png 492w, http:\/\/139.9.1.231\/wp-content\/uploads\/2025\/03\/image-11-300x24.png 300w\" sizes=\"(max-width: 492px) 100vw, 492px\" \/><\/figure>\n\n\n\n<p>\u4ece\u516c\u5f0f\u4e0a\u770b\uff0c\u8fd9\u79cd\u65b9\u5f0f\u53ef\u4ee5\u8ba9\u957f\u5ea6\u66f4\u957f\u7684\u90a3\u4e2aresponse\uff08\u4e0d\u7ba1\u662fchosen\u8fd8\u662frejected\uff09\u5b9e\u73b0\u4e00\u5b9a\u7684\u7f29\u653e\uff08\uff09\uff0c\u51cf\u5c11\u957f\u5ea6\u5e26\u6765\u7684\u4f3c\u7136\u6982\u7387\u7684\u65ad\u5d16\u5f0f\u4e0b\u6ed1\uff0c\u4f7f\u5176\u4e0e\u53e6\u4e00\u4e2a\u77edresponse\uff08\u4e0d\u53d7\u5f71\u54cd\uff09\u4e4b\u95f4\u66f4\u5177\u53ef\u6bd4\u6027\uff0c\u540c\u65f6\u53c8\u4e0d\u4f1a\u50cfSamPO\u90a3\u6837\u5b8c\u5168\u820d\u5f03\u6389\u989d\u5916\u90e8\u5206\u7684\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u4ece\u8bba\u6587\u4e2d\u7684\u5b9e\u9a8c\u7ed3\u679c\u770b\uff0c\u8fd9\u79cd\u65b9\u6cd5\u80fd\u591f\u5b9e\u73b0\u6bd4\u8f83\u597d\u7684\u957f\u5ea6\u63a7\u5236\uff0c\u4e14\u6a21\u578b\u6027\u80fd\u8fd8\u80fd\u6709\u4e00\u5b9a\u63d0\u5347\uff0c\u5e76\u4e14\u53ef\u4ee5\u901a\u8fc7\u8c03\u6574\u53c2\u6570\u00a0\u03b1\u00a0\u53ef\u4ee5\u5b9e\u73b0\u4e0d\u540c\u7a0b\u5ea6\u7684\u63a7\u5236\u6548\u679c\u3002\u53e6\u5916\u6587\u7ae0\u8fd8\u63d0\u51fa\u4e00\u4e2a\u6bd4\u8f83\u6709\u610f\u601d\u7684\u53d1\u73b0\uff0c\u5c31\u662f<strong>\u8fc7\u5ea6\u5197\u4f59\u7684\u56de\u7b54\u53ef\u80fd\u53cd\u800c\u4f1a\u635f\u5bb3\u6a21\u578b\u7684\u63a8\u7406\u80fd\u529b<\/strong>\uff0c\u4ed6\u4eec\u901a\u8fc7\u8fd9\u79cd\u65b9\u6cd5\u63a7\u5236\u957f\u5ea6\u540e\uff0c\u6a21\u578b\u7684\u63a8\u7406\u80fd\u529b\u4e5f\u6709\u660e\u663e\u63d0\u5347\u3002<\/p>\n\n\n\n<h3>\u5176\u4ed6\u5de5\u4f5c<\/h3>\n\n\n\n<p>\u9664\u6b64\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e9b\u5de5\u4f5c\u76f4\u63a5\u5728\u6570\u636e\u4e0a\u505a\u6587\u7ae0\uff0c\u901a\u8fc7\u63a7\u5236chosen\u548crejected\u7684\u957f\u5ea6\u5dee\u8ddd\u6765\u5b9e\u73b0\u957f\u5ea6\u63a7\u5236\uff0c\u5982<a rel=\"noreferrer noopener\" href=\"https:\/\/link.zhihu.com\/?target=https%3A\/\/arxiv.org\/pdf\/2406.17744\" target=\"_blank\">\u300aFollowing Length Constraints in Instructions\u300b<\/a>\uff08\u7b80\u79f0LIFT-DPO\uff09\u3002\u4ee5\u53ca\u5728\u4e00\u4e9b\u5f00\u6e90\u6a21\u578b\u7684\u6280\u672f\u62a5\u544a\u4e2d\u6211\u4eec\u4e5f\u80fd\u770b\u5230\u4e00\u4e9b\u76f8\u5173\u7684\u957f\u5ea6\u63a7\u5236\u65b9\u6cd5\uff0c\u5982\u5728\u5229\u7528RM\u6253\u5206\u6392\u5e8f\u65f6\u5c31\u7efc\u5408\u8003\u8651\u957f\u5ea6\u95ee\u9898\u7b49\uff0c\u8fd9\u4e9b\u6570\u636e\u5de5\u4f5c\u5c31\u4e0d\u518d\u8be6\u7ec6\u5c55\u5f00\u4e86\u3002<\/p>\n\n\n\n<h2>\u5982\u4f55\u5b9e\u73b0\u6709\u6548\u7684\u957f\u5ea6\u63a7\u5236\uff1f<\/h2>\n\n\n\n<ol><li><strong>RM\u7684\u4f18\u5316<\/strong>\uff1a\u524d\u9762\u8bb2\u7684\u90fd\u662f\u5bf9DPO\u8fdb\u884c\u957f\u5ea6\u63a7\u5236\u7684\u5de5\u4f5c\uff0c\u4f46\u5bf9RM\u672c\u8eab\u7684\u957f\u5ea6\u504f\u597d\u8fdb\u884c\u4f18\u5316\u7684\u5de5\u4f5c\u6ca1\u6709\u770b\u5230\u592a\u591a\uff0c\u5982\u679c\u5927\u5bb6\u6709\u770b\u5230\u76f8\u5173\u7684\u4e5f\u53ef\u4ee5\u5728\u8bc4\u8bba\u533a\u63d0\u4f9b\u4e00\u4e0b\u3002\u5982\u679c\u5c06RM\u672c\u8eab\u7684\u957f\u5ea6\u504f\u597d\u95ee\u9898\u89e3\u51b3\u7684\u8bdd\uff0c\u90a3\u5c31\u53ef\u4ee5\u6781\u5927\u7a0b\u5ea6\u4e0a\u89e3\u51b3\u8bad\u7ec3\u6570\u636e\u7684\u957f\u5ea6\u5206\u5e03\u5747\u8861\u95ee\u9898\u4e86\u3002<\/li><li><strong>\u6570\u636e\u7684\u4f18\u5316<\/strong>\uff1a\u6709\u4e9b\u5de5\u4f5c\u4f1a\u5728\u6570\u636e\u6784\u9020\u65f6\u5bf9\u957f\u5ea6\u8fdb\u884c\u7efc\u5408\u8003\u8651\uff0c\u5982\u5bf9RM\u6253\u5206\u8fdb\u884c\u957f\u5ea6\u5f52\u4e00\u540e\u518d\u6392\u5e8f\u3001\u91c7\u6837\u591a\u4e2a\u7b54\u6848\u8fdb\u884c\u6392\u5e8f\u65f6\u6839\u636e\u5747\u503c\u65b9\u5dee\u9650\u5236chosen\u7684\u957f\u5ea6\u7b49\uff0c\u901a\u8fc7\u8fd9\u4e9b\u65b9\u5f0f\u53ef\u4ee5\u51cf\u5c11\u957f\u5ea6\u5dee\u8ddd\u8fc7\u5927\u7684\u60c5\u51b5\u3002<strong>\u5982\u679c\u6570\u636e\u672c\u8eab\u7684\u957f\u5ea6\u5206\u5e03\u5747\u8861\u4e86\uff0c\u4e5f\u80fd\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u51cf\u7f13\u8fd9\u79cd\u95ee\u9898\u3002<\/strong><\/li><li><strong>\u8bad\u7ec3\u7b97\u6cd5\u4e0a\u7684\u4f18\u5316<\/strong>\uff1a\u5982\u679c\u4eceLD-DPO\u7684\u5206\u6790\u4e0a\u770b\uff0c\u5373\u4fbf\u6570\u636e\u5206\u5e03\u6bd4\u8f83\u5747\u8861\uff0c\u53ea\u8981\u5b58\u5728\u957f\u5ea6\u5dee\u5f02\uff0cDPO\u672c\u8eab\u7684\u957f\u5ea6\u654f\u611f\u6027\u5c31\u662f\u4f1a\u5bfc\u81f4\u6a21\u578b\u8f93\u51fa\u53d8\u957f\uff0c\u56e0\u6b64\u53ef\u80fd\u8fd8\u662f\u9700\u8981\u4e00\u4e9b\u7b97\u6cd5\u5c42\u9762\u7684\u4f18\u5316\uff0c\u6bd4\u5982\u5728<strong>DPO\u9636\u6bb5\u52a0\u5165SFTloss\u5c31\u662f\u4e00\u79cd\u7b80\u5355\u6709\u6548\u7684\u65b9\u6cd5\uff0c\u5728\u5f88\u591a\u516c\u5f00\u7684\u5927\u6a21\u578b\u6280\u672f\u62a5\u544a\u4e2d\u4e5f\u90fd\u6709\u7528\u5230\u8be5\u65b9\u6cd5\u3002\u53e6\u5916R-DPO\u3001SamPO\u548cLD-DPO\u7684\u957f\u5ea6\u63a7\u5236\u6548\u679c\u90fd\u7b97\u662f\u6bd4\u8f83\u597d\u7684\u65b9\u6cd5\u3002<\/strong><\/li><\/ol>\n\n\n\n<p>\u6700\u540e\u7ed3\u5408\u6211\u81ea\u5df1\u7684\u4e00\u4e9b\u5c1d\u8bd5\u6765\u76f4\u63a5\u5bf9\u6bd4\u4e00\u4e0b\u4e0a\u9762\u7684\u56db\u79cd\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ol><li>R-DPO\u662f\u901a\u8fc7\u52a0\u6b63\u5219\u9879\u7684\u65b9\u5f0f\u5b9e\u73b0\u957f\u5ea6\u63a7\u5236\uff0c\u8bf4\u662f\u6b63\u5219\u9879\uff0c\u4f46\u5176\u5b9e\u53ea\u662f\u4e00\u4e2a\u5e38\u6570\uff0c\u5176\u539f\u7406\u76f8\u5f53\u4e8e\u662f\u5bf9\u6bcf\u6761\u6570\u636e\u52a0\u4e0a\u4e00\u4e2a\u6743\u91cd\uff08\u6587\u7ae0\u4e2d\u4e5f\u63d0\u5230\u4e86\u8fd9\u70b9\uff09\uff0c\u5373\u5f53chosen\u548crejected\u957f\u5ea6\u5dee\u8ddd\u5927\u65f6\u964d\u4f4e\u8be5\u6570\u636e\u7684\u6743\u91cd\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u8be5\u65b9\u6cd5\u5176\u5b9e\u662f<strong>\u8ba9\u6a21\u578b\u51cf\u5c11\u5bf9\u957f\u5ea6\u5dee\u8ddd\u5927\u7684\u6570\u636e\u7684\u5b66\u4e60\u6743\u91cd<\/strong>\u3002\u8fd9\u79cd\u65b9\u6cd5\u786e\u5b9e\u53ef\u4ee5\u5b9e\u73b0\u4e00\u5b9a\u7684\u957f\u5ea6\u63a7\u5236\u6548\u679c\uff0c\u4f46\u5fc5\u7136\u4f1a\u51cf\u5c11\u4e00\u4e9b\u6570\u636e\u7684\u5229\u7528\u7387\uff0c\u8fd9\u53ef\u80fd\u4e5f\u662f\u8bad\u7ec3\u6548\u679c\u4f1a\u6709\u4e00\u5b9a\u635f\u5931\u7684\u539f\u56e0\u3002\u6211\u81ea\u5df1\u5c1d\u8bd5\u4e86\u4e00\u4e0b\u8be5\u65b9\u6848\uff0c\u5b9e\u9a8c\u4e0b\u6765\u786e\u5b9e\u53ef\u4ee5\u505a\u5230\u957f\u5ea6\u63a7\u5236\u6548\u679c\uff0c\u4f46\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\u6027\u80fd\u90fd\u4f1a\u6bd4\u6807\u51c6DPO\u5dee\u4e00\u4e9b\u3002<\/li><li>SimPO\u662f\u7528\u957f\u5ea6\u5f52\u4e00\u6765\u66ff\u6362Reference Model\u7684KL\u7ea6\u675f\uff0c\u7406\u8bba\u4e0a\u548c\u957f\u5ea6\u63a7\u5236\u5176\u5b9e\u6ca1\u6709\u592a\u5927\u5173\u7cfb\uff0c\u66f4\u591a\u7684\u662f\u7b80\u5316\u8bad\u7ec3\u548c\u63d0\u5347\u6027\u80fd\u3002\u5b9e\u9a8c\u7ed3\u679c\u786e\u5b9e\u4e5f\u4f53\u73b0\u4e86\u5e76\u4e0d\u4f1a\u6bd4\u6807\u51c6DPO\u66f4\u77ed\u3002\uff08\u8be5\u65b9\u6cd5\u70ed\u5ea6\u5f88\u9ad8\uff0c\u4f46\u7f51\u7edc\u4e0a\u8912\u8d2c\u4e0d\u4e00\uff0c\u5f88\u591a\u4eba\u8868\u793a\u65e0\u6cd5\u590d\u73b0\u7ed3\u679c\u3002\uff09\u6839\u636e\u6211\u81ea\u5df1\u5b9e\u9a8c\u7ecf\u9a8c\u6765\u770b\uff0c\u8dd1\u51fa\u597d\u7684\u7ed3\u679c\u9700\u8981\u4ed4\u7ec6\u8c03\u53c2\uff0c\u8bba\u6587\u63a8\u8350\u7684\u8d85\u53c2\u4e0d\u4e00\u5b9a\u9002\u5408\u6240\u6709\u60c5\u51b5\u3002<\/li><li>SamPO\u662f\u76f4\u63a5\u7528\u4e0b\u91c7\u6837\u7684\u65b9\u5f0f\uff0c\u5f3a\u884c<strong>\u5c06\u6a21\u578b\u89c6\u89d2\u4e0b\u7684\u957f\u7b54\u6848\u53d8\u5f97\u548c\u77ed\u7b54\u6848\u4e00\u6837\u957f<\/strong>\uff0c\u8be5\u65b9\u6cd5\u7ed9\u4eba\u7684\u76f4\u89c2\u611f\u53d7\u5c31\u662f\u957f\u5ea6\u63a7\u5236\u6548\u679c\u80af\u5b9a\u5f88\u597d\uff0c\u4f46\u662f\u5f88\u53ef\u80fd\u4f1a\u6709\u6027\u80fd\u635f\u5931\u3002\u4f46\u6211\u81ea\u5df1\u5b9e\u9a8c\u4e0b\u6765\uff0c\u957f\u5ea6\u63a7\u5236\u6548\u679c\u548cR-DPO\u5dee\u4e0d\u591a\uff0c\u4f46\u662f\u6027\u80fd\u4e5f\u6bd4\u8f83\u4e0d\u7a33\u5b9a\uff0c\u66f4\u6362\u968f\u673a\u79cd\u5b50\u5c31\u4f1a\u5bfc\u81f4\u6027\u80fd\u4ea7\u751f\u6ce2\u52a8\u3002\u6211\u4e5f\u5c1d\u8bd5\u8fc7\u5c06\u968f\u673a\u4e0b\u91c7\u6837\u6539\u4e3atop-k\u91c7\u6837\uff0c\u5373\u4fdd\u7559\u6982\u7387\u6700\u5927\u7684top-k\u4e2atoken\uff0c\u4f46\u6548\u679c\u5e76\u4e0d\u4f1a\u6bd4\u968f\u673a\u66f4\u597d\uff08\u8fd9\u4e48\u76f4\u89c9\u7684\u65b9\u6cd5\u53ef\u80fd\u8bba\u6587\u4f5c\u8005\u4e5f\u5c1d\u8bd5\u8fc7\u4e86\uff09\u3002<\/li><li>LD-DPO\u7684\u65b9\u6cd5\u662f\u53ea\u5bf9\u7b54\u6848\u8fc7\u957f\u7684\u90e8\u5206\u505a\u4e86\u89e3\u8026\u548c\u964d\u6743\u5904\u7406\uff0c\u901a\u8fc7\u964d\u4f4e\u8fc7\u957f\u90e8\u5206\u7684\u6743\u91cd\u6765\u5b9e\u73b0\u6574\u4e2a\u6761\u4ef6\u6982\u7387\u7684\u7f29\u653e\uff0c\u770b\u8d77\u6765\u662f\u56db\u79cd\u65b9\u6cd5\u4e2d\u5b9e\u73b0\u6700\u4f18\u96c5\u7684\u4e00\u79cd\uff0c<strong>\u65e2\u964d\u4f4e\u4e86\u957f\u5ea6\u5dee\u5f02\u5e26\u6765\u7684reward bias\u95ee\u9898\uff0c\u53c8\u4e0d\u4f1a\u4e22\u5f03\u4fe1\u606f<\/strong>\uff0c\u76f8\u5f53\u4e8e\u662f\u7528\u6781\u5c0f\u7684\u4ee3\u4ef7\u5b9e\u73b0\u4e86\u6982\u7387\u7f29\u653e\u76ee\u7684\u3002\u4ece\u8bba\u6587\u4e2d\u8d34\u51fa\u7684\u7ed3\u679c\u770b\uff0c\u786e\u5b9e\u4e5f\u662f\u6027\u80fd\u6700\u5f3a\u7684\u4e00\u4e2a\uff0c\u957f\u5ea6\u63a7\u5236\u6548\u679c\u4e5f\u662f\u6700\u597d\u7684\u3002\u4f46\u8bba\u6587\u4ee3\u7801\u6ca1\u6709\u5f00\u6e90\uff0c\u6240\u4ee5\u6ca1\u6709\u5b9e\u9a8c\u9a8c\u8bc1\u3002\u4f46\u4ece\u516c\u5f0f\u4e0a\u770b\u590d\u73b0\u96be\u5ea6\u5e94\u8be5\u4e0d\u662f\u5f88\u5927\uff0c\u6709\u80fd\u529b\u7684\u53ef\u4ee5\u5c1d\u8bd5\u590d\u73b0\u4e00\u4e0b\u770b\u770b\u6548\u679c\u3002<\/li><\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u6458\u81ea\uff1ahttps:\/\/zhuanlan.zhihu.com\/p\/5830338806 \u603b\u7684\u6765\u8bf4\uff0cDPO\u8ba9\u6a21\u578b\u8f93 &hellip; <a href=\"http:\/\/139.9.1.231\/index.php\/2025\/03\/06\/dpo-length-more-big\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">DPO\u4e3a\u4ec0\u4e48\u4f1a\u8ba9\u5927\u8bed\u8a00\u6a21\u578b\u8f93\u51fa\u53d8\u957f<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[42,4,38],"tags":[],"_links":{"self":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/25477"}],"collection":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/comments?post=25477"}],"version-history":[{"count":27,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/25477\/revisions"}],"predecessor-version":[{"id":25513,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/25477\/revisions\/25513"}],"wp:attachment":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/media?parent=25477"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/categories?post=25477"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/tags?post=25477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}