论文标题
关于变形金刚在低标记的视频识别中的令人惊讶的有效性
On the Surprising Effectiveness of Transformers in Low-Labeled Video Recognition
论文作者
论文摘要
最近,视力变压器在多个视力任务中广泛地使用基于卷积的方法(CNN)具有竞争力。与CNN相比,变形金刚的限制性偏差较小。但是,在图像分类设置中,这种灵活性在样本效率方面取决于变压器需要成像尺度训练。这个概念已延续到视频,其中尚未在低标记或半监视设置中探索用于视频分类的变压器。我们的工作从经验上探讨了视频分类的低数据制度,发现与CNN相比,变形金刚在低标记的视频设置中表现出色。我们专门评估了两个对比的视频数据集(Kinetics-400和SomeThingsomething-V2)中的视频视觉变压器,并进行详尽的分析和消融研究,以使用视频变压器体系结构的主要特征来解释这一观察结果。我们甚至表明,仅使用标记的数据,变形金刚显着优于复杂的半监督CNN方法,这些方法也利用了大规模未标记的数据。我们的实验告知我们的建议,即半监督的学习视频工作应该考虑将来使用视频变压器。
Recently vision transformers have been shown to be competitive with convolution-based methods (CNNs) broadly across multiple vision tasks. The less restrictive inductive bias of transformers endows greater representational capacity in comparison with CNNs. However, in the image classification setting this flexibility comes with a trade-off with respect to sample efficiency, where transformers require ImageNet-scale training. This notion has carried over to video where transformers have not yet been explored for video classification in the low-labeled or semi-supervised settings. Our work empirically explores the low data regime for video classification and discovers that, surprisingly, transformers perform extremely well in the low-labeled video setting compared to CNNs. We specifically evaluate video vision transformers across two contrasting video datasets (Kinetics-400 and SomethingSomething-V2) and perform thorough analysis and ablation studies to explain this observation using the predominant features of video transformer architectures. We even show that using just the labeled data, transformers significantly outperform complex semi-supervised CNN methods that leverage large-scale unlabeled data as well. Our experiments inform our recommendation that semi-supervised learning video work should consider the use of video transformers in the future.