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arXiv 2606.08077cs.CL
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支持向量评分准则:弥合自生成与人工评分准则之间的差距

Support Vector Rubrics: Closing the Gap Between Self-Generated and Human Rubrics

National Engineering Research Center for Software Engineering, Peking University(北京大学软件工程国家工程研究中心);University of Science and Technology of China(中国科学技术大学)

Mengyuan Sun, Yu Li, Zhuohao Yu, Shikun Zhang, Wei Ye

AI总结:

针对自生成评分准则在困难实例上落后于人工标注的问题,提出SVR框架,将准则构建转化为偏好数据上的最大间隔边界学习,通过对比特征挖掘、提示条件选择器和迭代优化,显著缩小与人工准则的差距,并展现出广泛的奖励建模能力。

摘要:

基于评分准则的评估是评判大语言模型(LLM)输出的一种有前景的范式,然而在困难实例上,自生成准则落后于人工标注的准则。我们认为这一判别差距反映了目标不匹配:自生成准则描述好的回答,而有效的准则必须区分相近的候选。为弥合这一差距,我们引入SVR(支持向量评分准则),一个将准则构建重新表述为偏好数据上的最大间隔边界学习的框架。SVR从偏好对中挖掘对比特征存入准则库,学习一个提示条件化的选择器以及全局准则权重,并通过支持对选择和对抗性探测困难负例来迭代优化准则库。在推理时,仅给定提示,SVR从库中检索顶级准则并对回答进行评分。在RubricBench上,SVR将差距从24.1分缩小到0.3分,并优于强自生成准则和评判基线,且学习到的准则库无需重新训练即可跨评判迁移。在RewardBench 1&2和RM-Bench上,它仍与专用奖励模型保持竞争力,展示了更广泛的奖励建模能力。总体而言,边界定义的准则为弥合LLM评估中的判别差距提供了一条原则性路径。

英文摘要:

Rubric-based evaluation is a promising paradigm for judging large language model (LLM) outputs, yet self-generated rubrics lag human-annotated criteria on hard instances. We argue this discriminative gap reflects an objective mismatch: self-generated rubrics describe good responses, whereas effective criteria must discriminate between close candidates. To close this gap, we introduce SVR (Support Vector Rubrics), a framework that recasts rubric construction as max-margin boundary learning over preference data. SVR mines contrastive features from preference pairs into a rubric bank, learns a prompt-conditioned selector together with global rubric weights, and iteratively refines the bank through support-pair selection and adversarial probing of hard negatives. At inference, given only the prompt, SVR retrieves the top-rubrics from the bank and scores responses. On RubricBench, SVR narrows the gap to human reference rubrics from 24.1 to 0.3 points and outperforms strong self-rubric and judge baselines, and the learned bank transfers across judges without retraining. On RewardBench 1&2, and RM-Bench, it remains competitive with dedicated reward models, demonstrating broader reward modeling capability. Overall, boundary-defining rubrics offer a principled route to closing the discriminative gap in LLM evaluation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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