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arXiv 2602.05935cs.LG
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无需给定异常数据即可调整异常检测器

Tuning Out-of-Distribution (OOD) Detectors Without Given OOD Data

Yale University(耶鲁大学)

Sudeepta Mondal, Xinyi Mary Xie, Ruxiao Duan, Alex Wong, Ganesh Sundaramoorthi

AI总结:

本文提出了一种无需额外数据的异常检测器调整方法,适用于不同参数量的检测器家族,提升了高参数量检测器的性能。

摘要:

现有的异常检测器通常通过一个被认定为相对于神经网络(NN)训练分布的异常数据集进行调整。异常检测器处理NN层的激活并评分输出,其中检测器的参数是通过拟合训练分布集和上述选定的异常数据集来确定的。在检测器训练时,这个选定的数据集可能不可用或难以获得,即使可用,也可能不具代表性,因为实际的异常数据通常是

英文摘要:

Existing out-of-distribution (OOD) detectors are often tuned by a separate dataset deemed OOD with respect to the training distribution of a neural network (NN). OOD detectors process the activations of NN layers and score the output, where parameters of the detectors are determined by fitting to an in-distribution (training) set and the aforementioned dataset chosen adhocly. At detector training time, this adhoc dataset may not be available or difficult to obtain, and even when it's available, it may not be representative of actual OOD data, which is often ''unknown unknowns." Current benchmarks may specify some left-out set from test OOD sets. We show that there can be significant variance in performance of detectors based on the adhoc dataset chosen in current literature, and thus even if such a dataset can be collected, the performance of the detector may be highly dependent on the choice. In this paper, we introduce and formalize the often neglected problem of tuning OOD detectors without a given ``OOD'' dataset. To this end, we present strong baselines as an attempt to approach this problem. Furthermore, we propose a new generic approach to OOD detector tuning that does not require any extra data other than those used to train the NN. We show that our approach improves over baseline methods consistently across higher-parameter OOD detector families, while being comparable across lower-parameter families.

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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