Effects of label noise on deep learning-based skin cancer classification

Medientyp: E-Artikel

Titel: Effects of label noise on deep learning-based skin cancer classification

Beteiligte: Hekler, Achim [Verfasser:in]; Kather, Jakob Nikolas [Verfasser:in]; Krieghoff-Henning, Eva [Verfasser:in]; Utikal, Jochen [Verfasser:in]; Meier, Friedegund [Verfasser:in]; Gellrich, Frank Friedrich [Verfasser:in]; Belzen, Julius Upmeier zu [Verfasser:in]; French, Lars E. [Verfasser:in]; Schlager, Justin Gabriel [Verfasser:in]; Ghoreschi, Kamran [Verfasser:in]; Wilhelm, Tabea [Verfasser:in]; Kutzner, Heinz [Verfasser:in]; Berking, Carola [Verfasser:in]; Heppt, Markus V. [Verfasser:in]; Haferkamp, Sebastian [Verfasser:in]; Sondermann, Wiebke [Verfasser:in]; Schadendorf, Dirk [Verfasser:in]; Schilling, Bastian [Verfasser:in]; Izar, Benjamin [Verfasser:in]; Maron, Roman C. [Verfasser:in]; Schmitt, Max [Verfasser:in]; Fröhling, Stefan [Verfasser:in]; Lipka, Daniel [Verfasser:in]; Brinker, Titus Josef [Verfasser:in]

Erschienen: 06 May 2020

Sprache: Englisch

DOI: 10.3389/fmed.2020.00177

Identifikator:

Schlagwörter: artificial intelligence ; Dermatology ; Label noise ; machine learning ; Melanoma ; Skin Cancer

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Beschreibung: Recent studies have shown that deep learning is capable of classifying dermatoscopic images at least as well as dermatologists. However, many studies in skin cancer classification utilize non-biopsy-verified training images. This imperfect ground truth introduces a systematic error, but the effects on classifier performance are currently unknown. Here, we systematically examine the effects of label noise by training and evaluating convolutional neural networks (CNN) with 804 images of melanoma and nevi labeled either by dermatologists or by biopsy. The CNNs are evaluated on a test set of 384 images by means of 4-fold cross validation comparing the outputs with either the corresponding dermatological or the biopsy-verified diagnosis. With identical ground truths of training and test labels, high accuracies with 75.03% (95% CI: 74.39-75.66%) for dermatological and 73.80% (95% CI: 73.10-74.51%) for biopsy-verified labels can be achieved. However, if the CNN is trained and tested with different ground truths, accuracy drops significantly to 64.53% (95% CI: 63.12-65.94%, p<0.01) on a non-biopsy-verified and to 64.24% (95% CI: 62.66-65.83%, p<0.01) on a biopsy-verified test set. In conclusion, deep learning methods for skin cancer classification are highly sensitive to label noise and future work should use biopsy-verified training images to mitigate this problem.

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