Multi-modal Self-Supervision from Generalized Data TransformationsDownload PDF

28 Sep 2020 (modified: 14 Jan 2021)ICLR 2021 Conference Blind SubmissionReaders: Everyone
  • Keywords: video representation learning, multi-modal learning, self-supervised learning, audio-visual learning, noise-contrastive learning
  • Abstract: In the image domain, excellent representation can be learned by inducing invariance to content-preserving transformations, such as image distortions. In this paper, we show that, for videos, the answer is more complex, and that better results can be obtained by accounting for the interplay between invariance, distinctiveness, multiple modalities and time. We introduce Generalized Data Transformations (GDTs) as a way to capture this interplay. GDTs reduce most previous self-supervised approaches to a choice of data transformations, even when this was not the case in the original formulations. They also allow to choose whether the representation should be invariant or distinctive w.r.t. each effect and tell which combinations are valid, thus allowing us to explore the space of combinations systematically. We show in this manner that being invariant to certain transformations and distinctive to others is critical to learning effective video representations, improving the state-of-the-art by a large margin, and even surpassing supervised pretraining. We demonstrate results on a variety of downstream video and audio classification and retrieval tasks, on datasets such as HMDB-51, UCF-101, DCASE2014, ESC-50 and VGG-Sound. In particular, we achieve new state-of-the-art accuracies of 72.8% on HMDB-51 and 95.2% on UCF-101.
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  • One-sentence Summary: A systematic framework to express invariance and distinctiveness induced by transformations in multi-modal representation learning, achieving state-of-the-art results on several audio and video benchmarks
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