ImageNet项目是一个用于视觉对象识别软件研究的大型可视化数据库。超过1400万的图像URL被ImageNet手动注释,以指示图片中的对象;在至少一百万个图像中,还提供了边界框。ImageNet包含2万多个类别; [2]一个典型的类别,如“气球”或“草莓”,包含数百个图像。第三方图像URL的注释数据库可以直接从ImageNet免费获得;但是,实际的图像不属于ImageNet。自2010年以来,ImageNet项目每年举办一次软件比赛,即ImageNet大规模视觉识别挑战赛(ILSVRC),软件程序竞相正确分类检测物体和场景。 ImageNet挑战使用了一个“修剪”的1000个非重叠类的列表。2012年在解决ImageNet挑战方面取得了巨大的突破,被广泛认为是2010年的深度学习革命的开始。

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该文提出一种简单而有效的方法,无需任何tricks,它可以将标准ResNet50的Top1精度提升到80%+。该方法是基于作者之前MEAL(通过判别方式进行知识蒸馏集成)改进而来,作者对MEAL进行了以下两点改进:

(1) 仅在最后的输出部分使用相似性损失与判别损失;

(2) 采用所有老师模型的平均概率作为更强的监督信息进行蒸馏。

该文提到一个非常重要的发现:在蒸馏阶段不应当使用one-hot方式的标签编码。这样一种简单的方案可以取得SOTA性能,且并未用到以下几种常见涨点tricks:(1)类似ResNet50-D的架构改进;(2)额外训练数据;(3) AutoAug、RandAug等;(4)cosine学习率机制;(5)mixup/cutmix数据增广策略;(6) 标签平滑。

在ImageNet数据集上,本文所提方法取得了80.67%的Top1精度(single crop@224),以极大的优势超越其他同架构方案。该方法可以视作采用知识蒸馏对ResNet50涨点的一个新的基准,该文可谓首个在不改变网路架构、无需额外训练数据的前提下将ResNet提升到超过80%Top1精度的方法。

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Remote sensing and automatic earth monitoring are key to solve global-scale challenges such as disaster prevention, land use monitoring, or tackling climate change. Although there exist vast amounts of remote sensing data, most of it remains unlabeled and thus inaccessible for supervised learning algorithms. Transfer learning approaches can reduce the data requirements of deep learning algorithms. However, most of these methods are pre-trained on ImageNet and their generalization to remote sensing imagery is not guaranteed due to the domain gap. In this work, we propose Seasonal Contrast (SeCo), an effective pipeline to leverage unlabeled data for in-domain pre-training of remote sensing representations. The SeCo pipeline is composed of two parts. First, a principled procedure to gather large-scale, unlabeled and uncurated remote sensing datasets containing images from multiple Earth locations at different timestamps. Second, a self-supervised algorithm that takes advantage of time and position invariance to learn transferable representations for remote sensing applications. We empirically show that models trained with SeCo achieve better performance than their ImageNet pre-trained counterparts and state-of-the-art self-supervised learning methods on multiple downstream tasks. The datasets and models in SeCo will be made public to facilitate transfer learning and enable rapid progress in remote sensing applications.

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Remote sensing and automatic earth monitoring are key to solve global-scale challenges such as disaster prevention, land use monitoring, or tackling climate change. Although there exist vast amounts of remote sensing data, most of it remains unlabeled and thus inaccessible for supervised learning algorithms. Transfer learning approaches can reduce the data requirements of deep learning algorithms. However, most of these methods are pre-trained on ImageNet and their generalization to remote sensing imagery is not guaranteed due to the domain gap. In this work, we propose Seasonal Contrast (SeCo), an effective pipeline to leverage unlabeled data for in-domain pre-training of remote sensing representations. The SeCo pipeline is composed of two parts. First, a principled procedure to gather large-scale, unlabeled and uncurated remote sensing datasets containing images from multiple Earth locations at different timestamps. Second, a self-supervised algorithm that takes advantage of time and position invariance to learn transferable representations for remote sensing applications. We empirically show that models trained with SeCo achieve better performance than their ImageNet pre-trained counterparts and state-of-the-art self-supervised learning methods on multiple downstream tasks. The datasets and models in SeCo will be made public to facilitate transfer learning and enable rapid progress in remote sensing applications.

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