Igeood: An Information Geometry Approach to Out-of-Distribution DetectionDownload PDF

29 Sept 2021, 00:34 (edited 15 Mar 2022)ICLR 2022 PosterReaders: Everyone
  • Keywords: out-of-distribution detection, anomaly detection, deep learning
  • Abstract: Reliable out-of-distribution (OOD) detection is fundamental to implementing safer modern machine learning (ML) systems. In this paper, we introduce Igeood, an effective method for detecting OOD samples. Igeood applies to any pre-trained neural network, works under various degrees of access to the ML model, does not require OOD samples or assumptions on the OOD data but can also benefit (if available) from OOD samples. By building on the geodesic (Fisher-Rao) distance between the underlying data distributions, our discriminator can combine confidence scores from the logits outputs and the learned features of a deep neural network. Empirically, we show that Igeood outperforms competing state-of-the-art methods on a variety of network architectures and datasets.
  • One-sentence Summary: We propose a flexible and effective out-of-distribution detection method by building on the Fisher-Rao distance between probability distributions.
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