S$^\mathbf{4}$L: Self-Supervised Semi-Supervised Learning S$^\mathbf{4}$L: Self-Supervised Semi-Supervised Learning
Paper summary It’s possible I’m missing something here, but my primary response to reading this paper is just a sense of confusion: that there is an implicit presenting of an approach as novel, when there doesn’t seem to me to be a clear mechanism that is changed from prior work. The premise of this paper is that self-supervised learning techniques (a subcategory of unsupervised learning, where losses are constructed based on reconstruction or perturbation of the original image) should be made into supervised learning by learning on a loss that is a weighted combination of the self-supervised loss and the supervised loss, making the overall method a semi-supervised one. The self-supervision techniques that they identify integrating into their semi-supervised framework are: - Rotation prediction, where an image is rotated to one of four rotation angles, and then a classifier is applied to guess what angle - Exemplar representation invariance, where an imagenet is cropped, mirrored, and color-randomized in order to provide inputs, whose representations are then pushed to be closer to the representation for the unmodified image My confusion is due to the fact that the I know that I’ve read several semi-supervised learning papers that do things of this ilk (insofar as combining unsupervised and supervised losses together) and it seems strange to identify it as a novel contribution. That said, this paper does give an interesting overview of self-supervisation techniques, I found it valuable to read for that purpose.
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S$^\mathbf{4}$L: Self-Supervised Semi-Supervised Learning
Xiaohua Zhai and Avital Oliver and Alexander Kolesnikov and Lucas Beyer
arXiv e-Print archive - 2019 via Local arXiv
Keywords: cs.CV, cs.LG

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Summary by CodyWild 2 months ago
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