在标注成本约束下,通过平衡数据量与质量提升模型性能。
Balancing Label Quantity and Quality for Scalable Elicitation
- 设计双质量数据混合策略,动态调节标注数量与质量
- 在固定预算下,模型准确率最高提升5个百分点
- 适合需要低成本高效训练的工业级NLP应用
大规模监督学习中,人类标注在复杂领域(如科学研究、代码工程)常不可靠或昂贵。现有研究多聚焦提升标注质量,而本工作关注在标注成本约束下的可扩展知识获取问题。我们基于Burns等(2023)的二分类任务,探索标注数量与质量之间的微观权衡。发现存在三种知识激发模式:数量主导、质量主导和混合模式——后者同时使用高低质量数据,在相同成本下实现更高准确率。通过引入少量提示(few-shot prompt),利用模型已有任务先验知识,可在固定标注预算下将监督微调准确率提升最多5个百分点。研究构建了可扩展方法的帕累托前沿,为实际部署提供最优权衡方案。
原文摘要 · Abstract (English)
Scalable oversight studies methods of training and evaluating AI systems in domains where human judgment is unreliable or expensive, such as scientific research and software engineering in complex codebases. Most work in this area has focused on methods of improving the quality of labels. Recent work by Burns et al. (2023) considers the complementary problem of training models with low-quality labels, finding that large pretrained models often have an inductive bias towards producing correct answers. In practice, however, neither label quantity nor quality is fixed: practitioners face a quantity-quality tradeoff. In this paper, we explore the microeconomics of the quantity-quality tradeoff on binary NLP classification tasks used in Burns et al. (2023). While sample-efficient learning has been studied extensively, little public research has focused on scalable elicitation: eliciting capabilities from pretrained models subject to labeling cost constraints. We find that this setting has novel dynamics caused by the tradeoff between label quantity and quality, as well as the model's existing latent capabilities. We observe three regimes of eliciting classification knowledge from pretrained models using supervised finetuning: quantity-dominant, quality-dominant, and a mixed regime involving the use of low- and high-quality data together to attain higher accuracy at a lower cost than using either alone. We explore sample-efficient elicitation methods that make use of two datasets of differing qualities, and establish a Pareto frontier of scalable elicitation methods that optimally trade off labeling cost and classifier performance. We find that the accuracy of supervised fine-tuning can be improved by up to 5 percentage points at a fixed labeling budget by adding a few-shot prompt to make use of the model's existing knowledge of the task.
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