Supervision Accelerates Pre-training in Contrastive Semi-Supervised Learning of Visual RepresentationsDownload PDF

Sep 28, 2020 (edited Mar 05, 2021)ICLR 2021 Conference Blind SubmissionReaders: Everyone
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  • Keywords: semi-supervised learning, contrastive learning, self-supervised learning, deep learning, representation learning, metric learning, visual representations
  • Abstract: We investigate a strategy for improving the efficiency of contrastive learning of visual representations by leveraging a small amount of supervised information during pre-training. We propose a semi-supervised loss, SuNCEt, based on noise-contrastive estimation and neighbourhood component analysis, that aims to distinguish examples of different classes in addition to the self-supervised instance-wise pretext tasks. On ImageNet, we find that SuNCEt can be used to match the semi-supervised learning accuracy of previous contrastive approaches while using less than half the amount of pre-training and compute. Our main insight is that leveraging even a small amount of labeled data during pre-training, and not only during fine-tuning, provides an important signal that can significantly accelerate contrastive learning of visual representations.
  • One-sentence Summary: A few labeled samples can accelerate contrastive pre-training.
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