Image-text retrieval in remote sensing aims to provide flexible information for data analysis and application. In recent years, state-of-the-art methods are dedicated to ``scale decoupling'' and ``semantic decoupling'' strategies to further enhance the capability of representation. However, these previous approaches focus on either the disentangling scale or semantics but ignore merging these two ideas in a union model, which extremely limits the performance of cross-modal retrieval models. To address these issues, we propose a novel Scale-Semantic Joint Decoupling Network (SSJDN) for remote sensing image-text retrieval. Specifically, we design the Bidirectional Scale Decoupling (BSD) module, which exploits Salience Feature Extraction (SFE) and Salience-Guided Suppression (SGS) units to adaptively extract potential features and suppress cumbersome features at other scales in a bidirectional pattern to yield different scale clues. Besides, we design the Label-supervised Semantic Decoupling (LSD) module by leveraging the category semantic labels as prior knowledge to supervise images and texts probing significant semantic-related information. Finally, we design a Semantic-guided Triple Loss (STL), which adaptively generates a constant to adjust the loss function to improve the probability of matching the same semantic image and text and shorten the convergence time of the retrieval model. Our proposed SSJDN outperforms state-of-the-art approaches in numerical experiments conducted on four benchmark remote sensing datasets.
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自Reddi等人以来。 2018年指出了亚当的分歧问题,已经设计了许多新变体以获得融合。但是,香草·亚当(Vanilla Adam)仍然非常受欢迎,并且在实践中效果很好。为什么理论和实践之间存在差距?我们指出,理论和实践的设置之间存在不匹配:Reddi等。 2018年选择亚当的超参数后选择问题,即$(\ beta_1,\ beta_2)$;虽然实际应用通常首先解决问题,然后调整$(\ beta_1,\ beta_2)$。由于这一观察,我们猜想只有当我们改变选择问题和超参数的顺序时,理论上的经验收敛才能是合理的。在这项工作中,我们确认了这一猜想。我们证明,当$ \ beta_2 $很大时,$ \ beta_1 <\ sqrt {\ beta_2} <1 $,Adam收集到关键点附近。邻居的大小是随机梯度方差的命题。在额外的条件(强烈生长条件)下,亚当收敛到关键点。随着$ \ beta_2 $的增加,我们的收敛结果可以覆盖[0,1)$中的任何$ \ beta_1 \,包括$ \ beta_1 = 0.9 $,这是深度学习库中的默认设置。我们的结果表明,亚当可以在广泛的超参数下收敛,而无需对其更新规则进行任何修改。据我们所知,我们是第一个证明这一结果的人,而没有强有力的假设,例如有限梯度。当$ \ beta_2 $很小时,我们进一步指出了一个$(\ beta_1,\ beta_2)$的大区域,亚当可以在其中偏离无限。我们的差异结果考虑与我们的收敛结果相同的设置,表明在增加$ \ beta_2 $时从差异到收敛的相变。这些正面和负面的结果可以提供有关如何调整亚当超级参数的建议。
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对地形信息有良好的了解对于改善复杂地形上各种下游任务的执行至关重要,尤其是对于腿部机器人的运动和导航。我们为神经城市地形重建提供了一个新颖的框架,并进行了不确定性估计。它通过稀疏的激光雷达观察结果在线生成密集的以机器人为中心的高程图。我们设计了一种新颖的预处理和点特征表示方法,可确保在整合多点云帧时确保高鲁棒性和计算效率。然后,贝叶斯gan模型恢复了详细的地形结构,同时提供了像素重建不确定性。我们通过广泛的模拟和现实世界实验评估了提议的管道。它在移动平台上展示了​​具有高质量和实时性能的有效地形重建,这进一步使腿部机器人的下游任务受益。 (有关更多详细信息,请参见https://kin-zhang.github.io/ndem/。)
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语义解析通过组成KB查询来求解知识库(KB)问题回答(KBQA),该查询通常涉及节点提取(NE)和图形组成(GC)以检测和连接查询中相关的节点。尽管NE和GC之间具有强烈的因果影响,但先前的作品未能直接建模其管道中的这种因果关系,从而阻碍了学习子任务相关性的学习。同样,先前作品中GC的序列产生过程会引起歧义和暴露偏见,从而进一步损害准确性。在这项工作中,我们将语义解析正式分为两个阶段。在第一阶段(图结构生成)中,我们提出了一个因果增强的桌面填充者,以克服序列模型的问题并学习内部因果关系。在第二阶段(关系提取)中,提出了一种有效的梁搜索算法,以扩展大规模KB的复杂查询。 LC-Quad 1.0的实验表明,我们的方法超过了先前的最新边距(17%),同时剩余时间和空间效率。代码和型号可在https://github.com/aozmh/crake上找到。
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机器的图像编码(ICM)旨在压缩图像进行AI任务分析,而不是满足人类的看法。学习一种既是一般(用于AI任务)的特征,也是紧凑的(用于压缩)的功能,这对于其成功而言至关重要。在本文中,我们试图通过学习通用功能,同时考虑压缩来开发ICM框架。我们将诸如无所不能功能和相应框架的功能命名为Omni-ICM。考虑到自我监督学习(SSL)提高了特征的概括,我们将其与压缩任务集成到OMNI-ICM框架中,以学习无所不能的功能。但是,在SSL中协调语义建模并在压缩中删除冗余是不平凡的,因此我们通过合作实例区分和熵最小化以自适应掉落的信息来设计新颖的信息过滤(如果)模块,以较弱相关的信息执行AI任务(例如,某些纹理冗余)。与以前的特定解决方案不同,Omni-ICM可以直接基于学习的无能功能的AI任务分析,而无需联合培训或额外的转换。尽管简单而直观,但Omni-ICM在多个基本愿景任务上大大优于现有的传统和基于学习的编解码器。
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受到人类使用多种感觉器官感知世界的事实的启发,具有不同方式的传感器在端到端驾驶中部署,以获得3D场景的全球环境。在以前的作品中,相机和激光镜的输入通过变压器融合,以更好地驾驶性能。通常将这些输入进一步解释为高级地图信息,以帮助导航任务。然而,从复杂地图输入中提取有用的信息很具有挑战性,因为冗余信息可能会误导代理商并对驾驶性能产生负面影响。我们提出了一种新颖的方法,可以从矢量化高清(HD)地图中有效提取特征,并将其利用在端到端驾驶任务中。此外,我们设计了一个新的专家,以通过考虑多道路规则来进一步增强模型性能。实验结果证明,两种提出的改进都可以使我们的代理人与其他方法相比获得卓越的性能。
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在许多机器学习应用程序中出现了非convex-concave min-max问题,包括最大程度地减少一组非凸函数的最大程度,并对神经网络的强大对抗训练。解决此问题的一种流行方法是梯度下降(GDA)算法,不幸的是,在非凸性的情况下可以表现出振荡。在本文中,我们引入了一种“平滑”方案,该方案可以与GDA结合以稳定振荡并确保收敛到固定溶液。我们证明,稳定的GDA算法可以实现$ O(1/\ epsilon^2)$迭代复杂性,以最大程度地减少有限的非convex函数收集的最大值。此外,平滑的GDA算法达到了$ O(1/\ epsilon^4)$ toseration复杂性,用于一般的nonconvex-concave问题。提出了这种稳定的GDA算法的扩展到多块情况。据我们所知,这是第一个实现$ o(1/\ epsilon^2)$的算法,用于一类NonConvex-Concave问题。我们说明了稳定的GDA算法在健壮训练中的实际效率。
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Marine waves significantly disturb the unmanned surface vehicle (USV) motion. An unmanned aerial vehicle (UAV) can hardly land on a USV that undergoes irregular motion. An oversized landing platform is usually necessary to guarantee the landing safety, which limits the number of UAVs that can be carried. We propose a landing system assisted by tether and robot manipulation. The system can land multiple UAVs without increasing the USV's size. An MPC controller stabilizes the end-effector and tracks the UAVs, and an adaptive estimator addresses the disturbance caused by the base motion. The working strategy of the system is designed to plan the motion of each device. We have validated the manipulator controller through simulations and well-controlled indoor experiments. During the field tests, the proposed system caught and placed the UAVs when the disturbed USV roll range was approximately 12 degrees.
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Deep neural networks are vulnerable to adversarial attacks. Ideally, a robust model shall perform well on both the perturbed training data and the unseen perturbed test data. It is found empirically that fitting perturbed training data is not hard, but generalizing to perturbed test data is quite difficult. To better understand adversarial generalization, it is of great interest to study the adversarial Rademacher complexity (ARC) of deep neural networks. However, how to bound ARC in multi-layers cases is largely unclear due to the difficulty of analyzing adversarial loss in the definition of ARC. There have been two types of attempts of ARC. One is to provide the upper bound of ARC in linear and one-hidden layer cases. However, these approaches seem hard to extend to multi-layer cases. Another is to modify the adversarial loss and provide upper bounds of Rademacher complexity on such surrogate loss in multi-layer cases. However, such variants of Rademacher complexity are not guaranteed to be bounds for meaningful robust generalization gaps (RGG). In this paper, we provide a solution to this unsolved problem. Specifically, we provide the first bound of adversarial Rademacher complexity of deep neural networks. Our approach is based on covering numbers. We provide a method to handle the robustify function classes of DNNs such that we can calculate the covering numbers. Finally, we provide experiments to study the empirical implication of our bounds and provide an analysis of poor adversarial generalization.
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组合多个传感器使机器人能够最大程度地提高其对环境的感知意识,并增强其对外部干扰的鲁棒性,对机器人导航至关重要。本文提出了可融合的基准测试,这是一个完整的多传感器数据集,具有多种移动机器人序列。本文提出了三项贡献。我们首先推进便携式和通用的多传感器套件,可提供丰富的感官测量值:10Hz激光镜点云,20Hz立体声框架图像,来自立体声事件相机的高速率和异步事件,来自IMU的200Hz惯性读数以及10Hz GPS信号。传感器已经在硬件中暂时同步。该设备轻巧,独立,并为移动机器人提供插件支持。其次,我们通过收集17个序列来构建数据集,该序列通过利用多个机器人平台进行数据收集来涵盖校园上各种环境。一些序列对现有的SLAM算法具有挑战性。第三,我们为将本地化和映射绩效评估提供了基础真理。我们还评估最新的大满贯方法并确定其局限性。该数据集将发布由原始传感器的设置,地面真相,校准数据和评估算法组成:https://ram-lab.com/file/site/site/multi-sensor-dataset。
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