类别不平衡发生在许多实际应用程序中,包括图像分类,其中每个类中的图像数量显着不同。通过不平衡数据,生成的对抗网络(GANS)倾向于多数类样本。最近的两个方法,平衡GaN(Bagan)和改进的Bagan(Bagan-GP)被提出为增强工具来处理此问题并将余额恢复到数据。前者以无人监督的方式预先训练自动化器权重。但是,当来自不同类别的图像具有类似的特征时,它是不稳定的。后者通过促进监督的自动化培训培训,基于蒲甘进行改善,但预先培训偏向于多数阶级。在这项工作中,我们提出了一种新颖的条件变形式自动化器,具有用于生成的对抗性网络(CAPAN)的平衡训练,作为生成现实合成图像的增强工具。特别是,我们利用条件卷积改变自动化器,为GaN初始化和梯度惩罚培训提供了监督和平衡的预培训。我们所提出的方法在高度不平衡版本的MNIST,时尚 - MNIST,CIFAR-10和两个医学成像数据集中呈现出卓越的性能。我们的方法可以在FR \'回路截止距离,结构相似性指数测量和感知质量方面综合高质量的少数民族样本。
translated by 谷歌翻译
The dominant multi-camera 3D detection paradigm is based on explicit 3D feature construction, which requires complicated indexing of local image-view features via 3D-to-2D projection. Other methods implicitly introduce geometric positional encoding and perform global attention (e.g., PETR) to build the relationship between image tokens and 3D objects. The 3D-to-2D perspective inconsistency and global attention lead to a weak correlation between foreground tokens and queries, resulting in slow convergence. We propose Focal-PETR with instance-guided supervision and spatial alignment module to adaptively focus object queries on discriminative foreground regions. Focal-PETR additionally introduces a down-sampling strategy to reduce the consumption of global attention. Due to the highly parallelized implementation and down-sampling strategy, our model, without depth supervision, achieves leading performance on the large-scale nuScenes benchmark and a superior speed of 30 FPS on a single RTX3090 GPU. Extensive experiments show that our method outperforms PETR while consuming 3x fewer training hours. The code will be made publicly available.
translated by 谷歌翻译
Video super-resolution (VSR) aiming to reconstruct a high-resolution (HR) video from its low-resolution (LR) counterpart has made tremendous progress in recent years. However, it remains challenging to deploy existing VSR methods to real-world data with complex degradations. On the one hand, there are few well-aligned real-world VSR datasets, especially with large super-resolution scale factors, which limits the development of real-world VSR tasks. On the other hand, alignment algorithms in existing VSR methods perform poorly for real-world videos, leading to unsatisfactory results. As an attempt to address the aforementioned issues, we build a real-world 4 VSR dataset, namely MVSR4$\times$, where low- and high-resolution videos are captured with different focal length lenses of a smartphone, respectively. Moreover, we propose an effective alignment method for real-world VSR, namely EAVSR. EAVSR takes the proposed multi-layer adaptive spatial transform network (MultiAdaSTN) to refine the offsets provided by the pre-trained optical flow estimation network. Experimental results on RealVSR and MVSR4$\times$ datasets show the effectiveness and practicality of our method, and we achieve state-of-the-art performance in real-world VSR task. The dataset and code will be publicly available.
translated by 谷歌翻译
Variational Graph Autoencoders (VGAEs) are powerful models for unsupervised learning of node representations from graph data. In this work, we systematically analyze modeling node attributes in VGAEs and show that attribute decoding is important for node representation learning. We further propose a new learning model, interpretable NOde Representation with Attribute Decoding (NORAD). The model encodes node representations in an interpretable approach: node representations capture community structures in the graph and the relationship between communities and node attributes. We further propose a rectifying procedure to refine node representations of isolated notes, improving the quality of these nodes' representations. Our empirical results demonstrate the advantage of the proposed model when learning graph data in an interpretable approach.
translated by 谷歌翻译
In this paper, we explore the feasibility of utilizing a mmWave radar sensor installed on a UAV to reconstruct the 3D shapes of multiple objects in a space. The UAV hovers at various locations in the space, and its onboard radar senor collects raw radar data via scanning the space with Synthetic Aperture Radar (SAR) operation. The radar data is sent to a deep neural network model, which outputs the point cloud reconstruction of the multiple objects in the space. We evaluate two different models. Model 1 is our recently proposed 3DRIMR/R2P model, and Model 2 is formed by adding a segmentation stage in the processing pipeline of Model 1. Our experiments have demonstrated that both models are promising in solving the multiple object reconstruction problem. We also show that Model 2, despite producing denser and smoother point clouds, can lead to higher reconstruction loss or even loss of objects. In addition, we find that both models are robust to the highly noisy radar data obtained by unstable SAR operation due to the instability or vibration of a small UAV hovering at its intended scanning point. Our exploratory study has shown a promising direction of applying mmWave radar sensing in 3D object reconstruction.
translated by 谷歌翻译
Optimal Transport(OT)提供了一个多功能框架,以几何有意义的方式比较复杂的数据分布。计算Wasserstein距离和概率措施之间的大地测量方法的传统方法需要网络依赖性域离散化,并且受差异性的诅咒。我们提出了Geonet,这是一个网状不变的深神经操作员网络,该网络从输入对的初始和终端分布对到Wasserstein Geodesic连接两个端点分布的非线性映射。在离线训练阶段,Geonet了解了以耦合PDE系统为特征的原始和双空间中OT问题动态提出的鞍点最佳条件。随后的推理阶段是瞬时的,可以在在线学习环境中进行实时预测。我们证明,Geonet在模拟示例和CIFAR-10数据集上达到了与标准OT求解器的可比测试精度,其推断阶段计算成本大大降低了。
translated by 谷歌翻译
远程患者监测(RPM)系统的最新进展可以识别各种人类活动,以测量生命体征,包括浅表血管的细微运动。通过解决已知的局限性和挑战(例如预测和分类生命体征和身体运动),将人工智能(AI)应用于该领域的医疗保健领域越来越兴趣,这些局限性和挑战被认为是至关重要的任务。联合学习是一种相对较新的AI技术,旨在通过分散传统的机器学习建模来增强数据隐私。但是,传统的联合学习需要在本地客户和全球服务器上培训相同的建筑模型。由于缺乏本地模型异质性,这限制了全球模型体系结构。为了克服这一点,在本研究中提出了一个新颖的联邦学习体系结构Fedstack,该体系支持结合异构建筑客户端模型。这项工作提供了一个受保护的隐私系统,用于以分散的方法住院的住院患者,并确定最佳传感器位置。提出的体系结构被应用于从10个不同主题的移动健康传感器基准数据集中,以对12个常规活动进行分类。对单个主题数据培训了三个AI模型ANN,CNN和BISTM。联合学习体系结构应用于这些模型,以建立能够表演状态表演的本地和全球模型。本地CNN模型在每个主题数据上都优于ANN和BI-LSTM模型。与同质堆叠相比,我们提出的工作表明,当地模型的异质堆叠表现出更好的性能。这项工作为建立增强的RPM系统奠定了基础,该系统纳入了客户隐私,以帮助对急性心理健康设施中患者进行临床观察,并最终有助于防止意外死亡。
translated by 谷歌翻译
从单眼RGB图像中重建3D手网络,由于其在AR/VR领域的巨大潜在应用,引起了人们的注意力越来越多。大多数最先进的方法试图以匿名方式解决此任务。具体而言,即使在连续录制会话中用户没有变化的实际应用程序中实际上可用,因此忽略了该主题的身份。在本文中,我们提出了一个身份感知的手网格估计模型,该模型可以结合由受试者的内在形状参数表示的身份信息。我们通过将提出的身份感知模型与匿名对待主题的基线进行比较来证明身份信息的重要性。此外,为了处理未见测试对象的用例,我们提出了一条新型的个性化管道来校准固有的形状参数,仅使用该受试者的少数未标记的RGB图像。在两个大型公共数据集上进行的实验验证了我们提出的方法的最先进性能。
translated by 谷歌翻译
最近,视觉变压器及其变体在人类和多视图人类姿势估计中均起着越来越重要的作用。将图像补丁视为令牌,变形金刚可以对整个图像中的全局依赖项进行建模或其他视图中的图像。但是,全球关注在计算上是昂贵的。结果,很难将这些基于变压器的方法扩展到高分辨率特征和许多视图。在本文中,我们提出了代币螺旋的姿势变压器(PPT)进行2D人姿势估计,该姿势估计可以找到粗糙的人掩模,并且只能在选定的令牌内进行自我注意。此外,我们将PPT扩展到多视图人类姿势估计。我们建立在PPT的基础上,提出了一种新的跨视图融合策略,称为人类区域融合,该策略将所有人类前景像素视为相应的候选者。可可和MPII的实验结果表明,我们的PPT可以在减少计算的同时匹配以前的姿势变压器方法的准确性。此外,对人类360万和滑雪姿势的实验表明,我们的多视图PPT可以有效地从多个视图中融合线索并获得新的最新结果。
translated by 谷歌翻译
聚类是基于它们的相似性对组对象的重要探索性数据分析技术。广泛使用的$ k $ -MEANS聚类方法依赖于一些距离的概念将数据划分为较少数量的组。在欧几里得空间中,$ k $ -Means的基于质心和基于距离的公式相同。在现代机器学习应用中,数据通常是作为概率分布而出现的,并且可以使用最佳运输指标来处理测量值数据。由于瓦斯坦斯坦空间的非负亚历山德罗夫曲率,巴里中心遭受了规律性和非舒适性问题。 Wasserstein Barycenters的特殊行为可能使基于质心的配方无法代表集群内的数据点,而基于距离的$ K $ -MEANS方法及其半决赛计划(SDP)可以恢复真实的方法集群标签。在聚集高斯分布的特殊情况下,我们表明SDP放松的Wasserstein $ k $ - 金钱可以实现精确的恢复,因为这些集群按照$ 2 $ - WASSERSTEIN MERTRIC进行了良好的分离。我们的仿真和真实数据示例还表明,基于距离的$ K $ -Means可以比基于标准的基于质心的$ k $ -Means获得更好的分类性能,用于聚类概率分布和图像。
translated by 谷歌翻译