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Fixing the train-test resolution discrepancy. (arXiv:1906.06423v4 [cs.CV] UPDATED)
Jan. 21, 2022, 2:11 a.m. | Hugo Touvron, Andrea Vedaldi, Matthijs Douze, Hervé Jégou
cs.LG updates on arXiv.org arxiv.org
Data-augmentation is key to the training of neural networks for image
classification. This paper first shows that existing augmentations induce a
significant discrepancy between the typical size of the objects seen by the
classifier at train and test time. We experimentally validate that, for a
target test resolution, using a lower train resolution offers better
classification at test time.
We then propose a simple yet effective and efficient strategy to optimize the
classifier performance when the train and test resolutions …
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