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arXiv · 2106.09643

MetaBalance: High-Performance Neural Networks for Class-Imbalanced Data

Arpit Bansal·Micah Goldblum·Valeriia Cherepanova·Avi Schwarzschild·C. Bayan Bruss·Tom Goldstein
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Abstract

Class-imbalanced data, in which some classes contain far more samples than others, is ubiquitous in real-world applications. Standard techniques for handling class-imbalance usually work by training on a re-weighted loss or on re-balanced data. Unfortunately, training overparameterized neural networks on such objectives causes rapid memorization of minority class data. To avoid this trap, we harness meta-learning, which uses both an ''outer-loop'' and an ''inner-loop'' loss, each of which may be balanced using different strategies. We evaluate our method, MetaBalance, on image classification, credit-card fraud detection, loan default prediction, and facial recognition tasks with severely imbalanced data, and we find that MetaBalance outperforms a wide array of popular re-sampling strategies.

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Arpit Bansal, Micah Goldblum, Valeriia Cherepanova, Avi Schwarzschild, C. Bayan Bruss, Tom Goldstein. 2021-06-17. MetaBalance: High-Performance Neural Networks for Class-Imbalanced Data. https://arxiv.org/abs/2106.09643

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