Most multimodal multi-objective evolutionary algorithms (MMEAs) aim to find all global Pareto optimal sets (PSs) for a multimodal multi-objective optimization problem (MMOP). However, in real-world problems, decision makers (DMs) may be also interested in local PSs. Also, searching for both global and local PSs is more general in view of dealing with MMOPs, which can be seen as a generalized MMOP. In addition, the state-of-the-art MMEAs exhibit poor convergence on high-dimension MMOPs. To address the above two issues, in this study, a novel coevolutionary framework termed CoMMEA for multimodal multi-objective optimization is proposed to better obtain both global and local PSs, and simultaneously, to improve the convergence performance in dealing with high-dimension MMOPs. Specifically, the CoMMEA introduces two archives to the search process, and coevolves them simultaneously through effective knowledge transfer. The convergence archive assists the CoMMEA to quickly approaching the Pareto optimal front (PF). The knowledge of the converged solutions is then transferred to the diversity archive which utilizes the local convergence indicator and the $\epsilon$-dominance-based method to obtain global and local PSs effectively. Experimental results show that CoMMEA is competitive compared to seven state-of-the-art MMEAs on fifty-four complex MMOPs.
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Federated embodied agent learning protects the data privacy of individual visual environments by keeping data locally at each client (the individual environment) during training. However, since the local data is inaccessible to the server under federated learning, attackers may easily poison the training data of the local client to build a backdoor in the agent without notice. Deploying such an agent raises the risk of potential harm to humans, as the attackers may easily navigate and control the agent as they wish via the backdoor. Towards Byzantine-robust federated embodied agent learning, in this paper, we study the attack and defense for the task of vision-and-language navigation (VLN), where the agent is required to follow natural language instructions to navigate indoor environments. First, we introduce a simple but effective attack strategy, Navigation as Wish (NAW), in which the malicious client manipulates local trajectory data to implant a backdoor into the global model. Results on two VLN datasets (R2R and RxR) show that NAW can easily navigate the deployed VLN agent regardless of the language instruction, without affecting its performance on normal test sets. Then, we propose a new Prompt-Based Aggregation (PBA) to defend against the NAW attack in federated VLN, which provides the server with a ''prompt'' of the vision-and-language alignment variance between the benign and malicious clients so that they can be distinguished during training. We validate the effectiveness of the PBA method on protecting the global model from the NAW attack, which outperforms other state-of-the-art defense methods by a large margin in the defense metrics on R2R and RxR.
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Implementing fully automatic unmanned surface vehicles (USVs) monitoring water quality is challenging since effectively collecting environmental data while keeping the platform stable and environmental-friendly is hard to approach. To address this problem, we construct a USV that can automatically navigate an efficient path to sample water quality parameters in order to monitor the aquatic environment. The detection device needs to be stable enough to resist a hostile environment or climates while enormous volumes will disturb the aquaculture environment. Meanwhile, planning an efficient path for information collecting needs to deal with the contradiction between the restriction of energy and the amount of information in the coverage region. To tackle with mentioned challenges, we provide a USV platform that can perfectly balance mobility, stability, and portability attributed to its special round-shape structure and redundancy motion design. For informative planning, we combined the TSP and CPP algorithms to construct an optimistic plan for collecting more data within a certain range and limiting energy restrictions.We designed a fish existence prediction scenario to verify the novel system in both simulation experiments and field experiments. The novel aquaculture environment monitoring system significantly reduces the burden of manual operation in the fishery inspection field. Additionally, the simplicity of the sensor setup and the minimal cost of the platform enables its other possible applications in aquatic exploration and commercial utilization.
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不利的天气条件(例如阴霾,雨水和雪)通常会损害被捕获的图像的质量,从而导致在正常图像上训练的检测网络在这些情况下概括了很差。在本文中,我们提出了一个有趣的问题 - 如果图像恢复和对象检测的结合可以提高不利天气条件下尖端探测器的性能。为了回答它,我们提出了一个有效但统一的检测范式,该范式通过动态增强学习将这两个子任务桥接在一起,以在不利的天气条件下辨别对象,称为Togethernet。与现有的努力不同,这些努力将图像除去/der绘制为预处理步骤,而是考虑了一个多任务联合学习问题。遵循联合学习方案,可以共享由恢复网络产生的清洁功能,以在检测网络中学习更好的对象检测,从而有助于TogEthERNET在不利天气条件下增强检测能力。除了联合学习体系结构外,我们还设计了一个新的动态变压器功能增强模块,以提高togethernet的功能提取和表示功能。对合成和现实世界数据集的广泛实验表明,我们的togethernet在定量和质量上都超过了最先进的检测方法。源代码可从https://github.com/yz-wang/togethernet获得。
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示范学习旨在通过在少数射击设置中提供回答的演示来指导及时的预测。尽管取得了令人鼓舞的结果,但现有工作仅将回答的示例与及时模板(包括原始上下文)相连,而无需任何其他操作,从而忽略了迅速示意的依赖性。此外,先前的研究发现,随机替换示威的标签极小地损害了性能,这表明该模型无法正确地了解示威活动所带来的知识。受到人类学习过程的启发,在本文中,我们引入了模仿演示学习(模仿),以通过明确模仿人类审查行为来加强演示学习,其中包括:(1)对比度学习机制,以专注于类似的演示。 (2)证明标签重新预测方法以合并已知知识。实验结果表明,我们提出的方法在14个分类中心中有11个实现了最先进的性能。进一步的研究还证明,模仿 - demo加强了迅速与示威之间的关联,这可以为探索示范学习的工作方式提供基础。
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生成的自我监督学习(SSL),尤其是蒙面自动编码器,已成为最令人兴奋的学习范式之一,并且在处理图形数据方面表现出了巨大的潜力。但是,现实世界图总是异质的,它提出了现有方法忽略的三个关键挑战:1)如何捕获复杂的图形结构? 2)如何合并各种节点属性? 3)如何编码不同的节点位置?鉴于此,我们研究了异质图上生成SSL的问题,并提出了HGMAE,这是一种新型的异质图掩盖自动编码器模型,以应对这些挑战。 HGMAE通过两种创新的掩蔽技术和三种独特的培训策略捕获了全面的图形信息。特别是,我们首先使用动态掩模速率开发Metapath掩盖和自适应属性掩蔽,以实现在异质图上有效和稳定的学习。然后,我们设计了几种培训策略,包括基于Metapath的边缘重建,以采用复杂的结构信息,目标属性恢复以结合各种节点属性,以及位置特征预测以编码节点位置信息。广泛的实验表明,HGMAE在多个数据集上的几个任务上均优于对比度和生成的最新基准。
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通过将元学习纳入基于区域的检测框架中,很少有射击对象检测经过广泛的研究。尽管取得了成功,但所述范式仍然受到几个因素的限制,例如(i)新型类别的低质量区域建议以及(ii)不同类别之间的类间相关性的过失。这种限制阻碍了基础知识的概括,以检测新型级别对象。在这项工作中,我们设计了元数据,(i)是第一个图像级的少量检测器,(ii)引入了一种新颖的类间相关元学习策略,以捕获和利用不同类别之间的相关性的相关性稳健而准确的几个射击对象检测。 meta-detr完全在图像级别工作,没有任何区域建议,这规避了普遍的几杆检测框架中不准确的建议的约束。此外,引入的相关元学习使元数据能够同时参加单个进料中的多个支持类别,从而可以捕获不同类别之间的类间相关性,从而大大降低了相似类别的错误分类并增强知识概括性参加新颖的课程。对多个射击对象检测基准进行的实验表明,所提出的元元删除优于大幅度的最先进方法。实施代码可在https://github.com/zhanggongjie/meta-detr上获得。
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最近提出的检测变压器(DETR)已建立了一个完全端到端的范式以进行对象检测。但是,DETR遭受慢训练的融合,这阻碍了其对各种检测任务的适用性。我们观察到,由于对象查询和编码图像特征之间的语义不一致,DETR的缓慢收敛在很大程度上归因于将对象查询与相关区域匹配的困难。通过此观察,我们设计了与DETR ++(SAM-DETR ++)设计的语义对齐匹配,以加速DETR的收敛并改善检测性能。 SAM-DETR ++的核心是一个插件模块,该模块将对象查询和编码图像功能投射到相同的功能嵌入空间中,在该空间中,每个对象查询都可以轻松地与具有相似语义的相关区域匹配。此外,SAM-DETR ++搜索了多个代表性关键点,并利用其功能以具有增强的表示能力的语义对齐匹配。此外,SAM-DETR ++可以根据设计的语义对准匹配,以粗到5的方式有效地融合多尺度特征。广泛的实验表明,所提出的SAM-DETR ++实现了优越的收敛速度和竞争性检测准确性。此外,作为一种插件方法,SAM-DETR ++可以以更好的性能补充现有的DITR收敛解决方案,仅使用12个训练时代获得44.8%的AP和49.1%的AP,并使用Resnet-50上的CoCo Val2017上的50个训练时代获得50个训练时期。代码可在https://github.com/zhanggongjie/sam-detr上找到。
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深层生成模型在逼真的图像合成中取得了显着的进展,并具有多种有条件的输入,而生成多样化但高保真的图像仍然是有条件图像生成的巨大挑战。本文介绍了有条件图像生成的多功能框架,其中包含了CNN的电感偏置和自动回归的强大序列建模,自然会导致图像生成多样化。我们没有像在先前的研究中独立量化多个域的特征,而是设计了一个具有变异正常化程序的集成量化方案,该方案将特征离散化在多个域中,并显着提高了自动回归建模性能。值得注意的是,变异正常器使通过惩罚分布的内域变化来使特征分布在无与伦比的潜在空间中进行正规化。此外,我们设计了一种牙龈样本策略,该策略允许将分配不确定性纳入自动回归训练程序中。牙胶采样大大减轻了暴露偏见,通常会在训练和推理阶段造成未对准并严重损害推理性能。对多条条件图像生成任务进行的广泛实验表明,与最先进的方法相比,我们的方法在定性和定量上实现了卓越的图像生成性能。
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符号知识图(kgs)是通过昂贵的人众包或特定于域特异性的复杂信息提取管道来构建的。诸如BERT之类的新兴大型语言模型(LMS)已显示出隐式编码的大量知识,可以使用正确设计的提示来查询。但是,与明确的公斤相比,黑盒LMS中的知识通常很难访问或编辑,并且缺乏解释性。在这项工作中,我们旨在从LMS收获符号KG,这是一个由神经LMS的灵活性和可扩展性增强的自动kg构造的新框架。与通常依赖大型人类注释的数据或现有大量KG的先前作品相比,我们的方法仅需要对关系的最小定义作为输入,因此适合于以前无法提取有关丰富新关系的知识。该方法会自动生成多样化的提示,并在给定的LM内执行有效的知识搜索,以进行一致和广泛的输出。与以前的方法相比,使用我们的方法收获的知识要准确得多,如自动和人类评估所示。结果,我们源于多元化的LMS,一个新的KG家族(例如Bertnet和Robertanet),其中包含一套更丰富的常识关系,包括复杂的关系(例如,A对B的能力,但不擅长B”)人类注销的kg(例如概念网)。此外,由此产生的kg也是解释各自的源LMS的工具,从而导致对不同LMS不同知识能力的新见解。
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