MetaAI DINOv2 is a foundation model for computer vision. DINOv2 paper shows that existing pretraining methods, especially self-supervised methods, can produce all purpose visual features, (i.e., features that work across image distributions and tasks without finetuning) if trained on enough curated data from diverse sources. It turns out that the approach of DINOv2 can match patch-level features between images from different domains, poses and even objects that share similar semantic information. This exhibits the ability of DINO v2 model to transfer across domains and understand relations between similar parts of different objects. The Meta shows its strengths and wants to combine DINOv2 with large language models.

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MAE is a simple autoencoding approach that reconstructs the original signal - image - given its partial observation. Thanks to successful introduction of patching approach in ViT it has become more feasible for CV as an alternative to convnets. The MEA paper use the ViT's patch-based approach to replicate masking strategy (similarly to BERT) for image patches. MAE randomly samples (without replacement) uniformly distributed and non-overlapping patches regularly created from image. MAE learns very high-capacity models that generalize well. Thanks to very high masking ratio (e.g., 75%) authors were able to reduce the training time by >3x while at the same time reducing the memory consumption thus, enabling the MAE to scale better for large models, like ViT-Large/-Huge on ImageNet-1K with 87.8% accuracy.

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Self-DIstillation with NO labels (DINO) is a self-supervised method based on Vision Transformer (ViT) from Facebook AI with the ability to learn representation from unlabeled data. The architecture is able to learn automatically class-specific features, allowing the unsupervised object segmentation. The paper claims that the self-supervised methods adapted to ViT not only works very well, but one can also observe that the self-supervised ViT features contain explicit semantic segmentation information of an image, which is not that clear in case of supervised ViT, nor with convnets. The benefit of such observation is that such features are also very good k-NN classifiers. The performance results are reported to be highly dependent on two SSL approaches: the momentum teacher and multicrop training. In this blog post we will explain the details on what DINO is all about.

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