论文标题
诗：通过后抽样的分发检测
POEM: Out-of-Distribution Detection with Posterior Sampling
论文作者
论文摘要
对于在开放世界中部署的机器学习模型是必不可少的。最近，在训练期间（也称为离群暴露）在训练期间使用辅助外离群值数据集已显示出令人鼓舞的性能。由于潜在的OOD数据的样本空间可以过大，因此对众所周知的抽样概况至关重要。在这项工作中，我们提出了一个新型的基于后取样的离群挖掘框架，诗，这有助于有效利用异常数据，并促进了ID和OOD数据之间紧凑的决策边界，以改善检测。我们表明，诗在共同基准上建立了最先进的表现。与当前使用贪婪采样策略的最佳方法相比，诗在CIFAR-10和CIFAR-100上分别提高了相对性能的42.0％和24.2％（FPR95）。我们进一步提供了有关诗歌检测有效性的理论见解。
Out-of-distribution (OOD) detection is indispensable for machine learning models deployed in the open world. Recently, the use of an auxiliary outlier dataset during training (also known as outlier exposure) has shown promising performance. As the sample space for potential OOD data can be prohibitively large, sampling informative outliers is essential. In this work, we propose a novel posterior sampling-based outlier mining framework, POEM, which facilitates efficient use of outlier data and promotes learning a compact decision boundary between ID and OOD data for improved detection. We show that POEM establishes state-of-the-art performance on common benchmarks. Compared to the current best method that uses a greedy sampling strategy, POEM improves the relative performance by 42.0% and 24.2% (FPR95) on CIFAR-10 and CIFAR-100, respectively. We further provide theoretical insights on the effectiveness of POEM for OOD detection.
