Cited by 77Anomaly Detection Techniques and ApplicationsCutaneous Melanoma Detection and ManagementAdvanced Neural Network Applications

Does your dermatology classifier know what it doesn’t know? Detecting the long-tail of unseen conditions

Open access
Guha Roy, Abhijit, Ren, Jie, Azizi, Shekoofeh, Loh, Aaron, Natarajan, Vivek, Mustafa, Basil, Pawlowski, Nick, Freyberg, Jan +13 more·2022·Medical Image Analysis

Abstract

Supervised deep learning models have proven to be highly effective in classification of dermatological conditions. These models rely on the availability of abundant labeled training examples. However, in the real-world, many dermatological conditions are individually too infrequent for per-condition classification with supervised learning. Although individually infrequent, these conditions may collectively be common and therefore are clinically significant in aggregate. To prevent models from generating erroneous outputs on such examples, there remains a considerable unmet need for deep learning systems that can better detect such infrequent conditions. These infrequent 'outlier' conditions are seen very rarely (or not at all) during training. In this paper, we frame this task as an out-of-distribution (OOD) detection problem. We set up a benchmark ensuring that outlier conditions are disjoint between the model training, validation, and test sets. Unlike traditional OOD detection benchmarks where the task is to detect dataset distribution shift, we aim at the more challenging task of detecting subtle differences resulting from a different pathology or condition. We propose a novel hierarchical outlier detection (HOD) loss, which assigns multiple abstention classes corresponding to each training outlier class and jointly performs a coarse classification of inliers vs. outliers, along with fine-grained classification of the individual classes. We demonstrate that the proposed HOD loss based approach outperforms leading methods that leverage outlier data during training. Further, performance is significantly boosted by using recent representation learning methods (BiT, SimCLR, MICLe). Further, we explore ensembling strategies for OOD detection and propose a diverse ensemble selection process for the best result. We also perform a subgroup analysis over conditions of varying risk levels and different skin types to investigate how OOD performance changes over each subgroup and demonstrate the gains of our framework in comparison to baseline. Furthermore, we go beyond traditional performance metrics and introduce a cost matrix for model trust analysis to approximate downstream clinical impact. We use this cost matrix to compare the proposed method against the baseline, thereby making a stronger case for its effectiveness in real-world scenarios.

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  • For a disease in the long tail of the training distribution, the neural network has not seen enough data points to capture all of its possible manifestations and refine its decision boundary.

    “For a disease in the long tail of the training distribution, the neural network has not seen enough data points to capture all of its possible manifestations and refine its decision boundary45.”

    From Generating dermatopathology reports from gigapixel whole slide images with HistoGPT (2025) · cites this paper as [45]

    The Introduction (pp. 1–2) says long-tail dermatological conditions have too few per-condition training examples for practical supervised classification. It does not say that the network fails to capture all possible manifestations or refine its decision boundary; those are additional explanations supplied by the citing sentence. (LLM, conf=0.85)

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Research works printed but not linked: 4

  1. Hendrycks, D., Liu, X., Wallace, E., Dziedzic, A., Krishnan, R., Song, D., 2020b. Pretrained transformers improve out-ofdistribution robustness. arXiv preprint arXiv:2004.06100 . · arXiv
  2. Qiao, S., Wang, H., Liu, C., Shen, W., Yuille, A., 2019. Weight standardization. arXiv preprint arXiv:1903.10520 . · arXiv
  3. Thulasidasan, S., Thapa, S., Dhaubhadel, S., Chennupati, G., Bhattacharya, T., Bilmes, J., 2021. A simple and effective baseline for out-of-distribution detection using abstention URL: https: //openreview.net/forum?id=q\_Q9MMGwSQu .
  4. Van Amersfoort, J., Smith, L., Teh, Y.W., Gal, Y., 2020. Uncertainty estimation using a single deep deterministic neural network. International Conference on Machine Learning , 9690-9700.

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Authors
Guha Roy, A., Ren, J., Azizi, S., Loh, A., Natarajan, V., Mustafa, B., Pawlowski, N., Freyberg, J., Liu, Y., Beaver, Z., Vo, N., Bui, P., Winter, S., MacWilliams, P., Corrado, G. S., Telang, U., Liu, Y., Cemgil, T., Karthikesalingam, A., Lakshminarayanan, B., & Winkens, J.
Affiliations
Google (United States) (US)
Venue
Medical Image Analysis
Publisher
Elsevier BV
Published
2022-01
Volume
75
Pages
102274
ISSN
1361-8415 (ISSN-L)
OpenAlex
W3142659855
Cited by
77
References
59
Citations by year
2026: 3 · 2025: 16 · 2024: 21 · 2023: 17 · 2022: 11 · 2021: 9
FWCI
5.08
Type
journal article
Language
en
Open access
Locations
  • Medical Image Analysis (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • arXiv (Cornell University) (cc-by)
Topics
  • Physical Sciences › Computer Science › Artificial Intelligence › Anomaly Detection Techniques and Applications
  • Health Sciences › Medicine › Oncology › Cutaneous Melanoma Detection and Management
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Advanced Neural Network Applications
Keywords
out-of-distribution detection, abstention, representation learning, ensemble selection, subgroup analysis, cost matrix, clinical impact
MeSH terms
Dermatology, Humans, Benchmarking

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