arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2209.06408cs.LG
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元模式关注分数:一种具有人类价值的多分类器新型评估指标

Meta Pattern Concern Score: A Novel Evaluation Measure with Human Values for Multi-classifiers

The University of Hong Kong(香港大学);East China Normal University(华东师范大学)

Yanyun Wang, Dehui Du, Yuanhao Liu

AI总结:

提出元模式关注分数,一种基于概率预测抽象表示和可调阈值的多分类器评估指标,引入人类价值,可动态调整学习率,实验证明其有效性并显著减少危险案例。

摘要:

虽然先进的分类器越来越多地用于现实世界中的安全关键应用,但如何根据特定的人类价值来恰当评估黑盒模型仍然是社区关注的问题。这些人类价值包括以不同程度惩罚不同严重性的错误案例,以及为了减少特定危险案例而在总体性能上做出妥协。在本文中,我们提出了一种名为元模式关注分数的新型评估指标,基于概率预测的抽象表示和预测置信度让步的可调阈值,将人类价值引入多分类器。技术上,我们借鉴了两种常见指标(即基于混淆矩阵的评估指标和损失值)的优缺点,使得我们的指标在一般任务下也像它们一样有效,并且交叉熵损失在极限情况下成为我们指标的一个特例。此外,我们的指标还可用于通过动态调整学习率来改进模型训练。在四种模型和六个数据集上的实验证实了我们指标的有效性和效率。案例研究表明,它不仅能找到理想模型,仅牺牲0.04%的训练准确率就减少了0.53%的危险案例,而且还能调整学习率以训练一个新模型,该模型平均优于原始模型,其自身值低1.62%,危险案例数量减少0.36%。

英文摘要:

While advanced classifiers have been increasingly used in real-world safety-critical applications, how to properly evaluate the black-box models given specific human values remains a concern in the community. Such human values include punishing error cases of different severity in varying degrees and making compromises in general performance to reduce specific dangerous cases. In this paper, we propose a novel evaluation measure named Meta Pattern Concern Score based on the abstract representation of probabilistic prediction and the adjustable threshold for the concession in prediction confidence, to introduce the human values into multi-classifiers. Technically, we learn from the advantages and disadvantages of two kinds of common metrics, namely the confusion matrix-based evaluation measures and the loss values, so that our measure is effective as them even under general tasks, and the cross entropy loss becomes a special case of our measure in the limit. Besides, our measure can also be used to refine the model training by dynamically adjusting the learning rate. The experiments on four kinds of models and six datasets confirm the effectiveness and efficiency of our measure. And a case study shows it can not only find the ideal model reducing 0.53% of dangerous cases by only sacrificing 0.04% of training accuracy, but also refine the learning rate to train a new model averagely outperforming the original one with a 1.62% lower value of itself and 0.36% fewer number of dangerous cases.

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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