Shunxin Wang Raymond N. J. Veldhuis Christoph Brune Nicola Strisciuglio What do neural networks learn in image classification? A frequency shortcut perspective. 2023 abs/2307.09829 CoRR https://doi.org/10.48550/arXiv.2307.09829 db/journals/corr/corr2307.html#abs-2307-09829