We propose UnMixMatch, a semi-supervised learning framework which can learn effective representations from unconstrained unlabelled data in order to scale up performance. Most existing semi-supervised methods rely on the assumption that labelled and unlabelled samples are drawn from the same distribution, which limits the potential for improvement through the use of free-living unlabeled data. Consequently, the generalizability and scalability of semi-supervised learning are often hindered by this assumption. Our method aims to overcome these constraints and effectively utilize unconstrained unlabelled data in semi-supervised learning. UnMixMatch consists of three main components: a supervised learner with hard augmentations that provides strong regularization, a contrastive consistency regularizer to learn underlying representations from the unlabelled data, and a self-supervised loss to enhance the representations that are learnt from the unlabelled data. We perform extensive experiments on 4 commonly used datasets and demonstrate superior performance over existing semi-supervised methods with a performance boost of 4.79%. Extensive ablation and sensitivity studies show the effectiveness and impact of each of the proposed components of our method.

提出了一种名为UnMixMatch的半监督学习框架，该框架可以从无约束的未标记数据中学习有效表示，以提高性能。它由三个组件组成：具有硬增强的监督学习器提供强大的正则化，对照一致性正则化器从未标记数据中学习底层表示以及自监督损失用于增强从未标记数据中学习的表示。在4个常用数据集上进行了实验，在现有的半监督方法上表现出卓越的性能提高4.79%。广泛的消融和敏感性研究表明了我们方法的每个提出组件的有效性和影响。

使用无约束未标记数据扩大半监督学习规模