We present a collaborative learning method called Mutual Contrastive Learning (MCL) for general visual representation learning. The core idea of MCL is to perform mutual interaction and transfer of contrastive distributions among a cohort of models. Benefiting from MCL, each model can learn extra contrastive knowledge from others, leading to more meaningful feature representations for visual recognition tasks. We emphasize that MCL is conceptually simple yet empirically powerful. It is a generic framework that can be applied to both supervised and self-supervised representation learning. Experimental results on supervised and self-supervised image classification, transfer learning and few-shot learning show that MCL can lead to consistent performance gains, demonstrating that MCL can guide the network to generate better feature representations.
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