开放式识别(OSR)的目的是同时检测未知类别的样本并分类已知的级别样本。大多数现有的OSR方法是归纳方法,通常遭受域移位问题的困扰,从已知类别域中学习的模型可能不适合不知名的类域。解决这个问题的启发,受到跨导性学习在许多其他视觉任务中减轻域转移问题的成功的启发,我们提出了一个迭代的转移性OSR框架,称为IT-OSR,该框架的实现了三个探索的模块,包括一个可靠性采样模块,A功能生成模块和基线更新模块。具体而言,在每次迭代中,在探索的可靠性采样模块中介绍了双空间一致的采样方法,用于根据基线方法分配的伪标签从测试样本中选择一些相对可靠的采样模块,这可能是任意的敏感性OSRR方法。然后,在正交编码条件下设计的有条件的双对逆向生成网络在特征生成模块中设计,以根据所选的测试样品和伪标签生成已知类和未知类别的判别样品特征。最后,通过共同利用生成的功能,带有伪标签的选定测试样品和训练样本,对基线更新模块中的样本进行了重新预测进行了更新。标准数据集和交叉数据集设置的广泛实验结果表明,通过将两种典型的电感OSR方法引入所提出的IT-OSR框架中,派生的转导方法比15种最先进的方法更好地执行了更好的性能。在大多数情况下。
translated by 谷歌翻译
The dynamic expansion architecture is becoming popular in class incremental learning, mainly due to its advantages in alleviating catastrophic forgetting. However, task confusion is not well assessed within this framework, e.g., the discrepancy between classes of different tasks is not well learned (i.e., inter-task confusion, ITC), and certain priority is still given to the latest class batch (i.e., old-new confusion, ONC). We empirically validate the side effects of the two types of confusion. Meanwhile, a novel solution called Task Correlated Incremental Learning (TCIL) is proposed to encourage discriminative and fair feature utilization across tasks. TCIL performs a multi-level knowledge distillation to propagate knowledge learned from old tasks to the new one. It establishes information flow paths at both feature and logit levels, enabling the learning to be aware of old classes. Besides, attention mechanism and classifier re-scoring are applied to generate more fair classification scores. We conduct extensive experiments on CIFAR100 and ImageNet100 datasets. The results demonstrate that TCIL consistently achieves state-of-the-art accuracy. It mitigates both ITC and ONC, while showing advantages in battle with catastrophic forgetting even no rehearsal memory is reserved.
translated by 谷歌翻译
本文提出了一种新颖的视频介绍方法。我们做出了三个主要贡献:首先,我们通过引入基于贴片的同型(DEPTH)扩展了以前的变压器,以补丁的对齐方式扩展了贴片对齐,该均值(DEPTH)改善了补丁级的功能对齐,而没有其他有各种变形的监督和受益的挑战场景。其次,我们引入了基于面膜修剪的贴片注意力(MPPA),以通过修剪较少的基本功能和使用显着性图来改善贴合的功能匹配。MPPA用无效的像素增强了扭曲令牌之间的匹配精度。第三,我们引入了空间加权适配器(STA)模块,以在从深度中学到的变形因子的指导下,准确地关注空间代币,尤其是对于具有敏捷运动的视频。实验结果表明,我们的方法在定性和定量上优于最新方法,并实现了新的最新方法。
translated by 谷歌翻译
联合学习(FL)框架使Edge客户能够协作学习共享的推理模型,同时保留对客户的培训数据的隐私。最近,已经采取了许多启发式方法来概括集中化的自适应优化方法,例如SGDM,Adam,Adagrad等,以提高收敛性和准确性的联合设置。但是,关于在联合设置中的位置以及如何设计和利用自适应优化方法的理论原理仍然很少。这项工作旨在从普通微分方程(ODE)的动力学的角度开发新的自适应优化方法,以开发FL的新型自适应优化方法。首先,建立了一个分析框架,以在联合优化方法和相应集中优化器的ODES分解之间建立连接。其次,基于这个分析框架,开发了一种动量解耦自适应优化方法FedDA,以充分利用每种本地迭代的全球动量并加速训练收敛。最后但并非最不重要的一点是,在训练过程结束时,全部批处理梯度用于模仿集中式优化,以确保收敛并克服由自适应优化方法引起的可能的不一致。
translated by 谷歌翻译
直到最近,研究人员才试图提供可证明的群体公平保证的分类算法。这些算法中的大多数都受到训练和部署数据遵循相同分布的要求造成的骚扰。本文提出了一种输入 - 不合时宜的团体公平算法,即Fairsmooth,用于改善分类模型的公平性,同时保持显着的预测准确性。开发了一种高斯参数平滑方法,以将基本分类器转换为平滑版本。通过仅使用有关该组的数据来学习一个最佳的单个平滑分类器,并且通过平均所有单个平滑的参数来生成所有组的总体平滑分类器。通过利用非线性功能分析的理论,将平滑的分类器重新构成NemyTSKII操作员的输出函数。进行理论分析是为了得出Nemytskii操作员的平滑状态并诱导特征差异的平滑歧管。从理论上讲,我们证明了平滑歧管具有一个全局LIPSCHITZ常数,该常数独立于输入数据的域,该域衍生了输入 - 不合时式认证的组公平性。
translated by 谷歌翻译
学习模当融合的表示和处理未对准的多模式序列在多式联情绪识别中是有意义的,具有挑战性。现有方法使用定向成对注意力或消息中心到熔丝语言,视觉和音频模态。然而,这些方法在融合特征时介绍信息冗余,并且在不考虑方式的互补性的情况下效率低效。在本文中,我们提出了一种高效的神经网络,以学习与CB变压器(LMR-CBT)的模型融合表示,用于从未对准的多模式序列进行多峰情绪识别。具体地,我们首先为三种方式执行特征提取,以获得序列的局部结构。然后,我们设计具有跨模块块(CB变压器)的新型变压器,其能够实现不同模式的互补学习,主要分为局部时间学习,跨模型特征融合和全球自我关注表示。此外,我们将融合功能与原始特征拼接以对序列的情绪进行分类。最后,我们在三个具有挑战性的数据集,IEMocap,CMU-MOSI和CMU-MOSEI进行词语对齐和未对准的实验。实验结果表明我们在两个设置中提出的方法的优势和效率。与主流方法相比,我们的方法以最小数量的参数达到最先进的。
translated by 谷歌翻译
基于音频视频的多模式情绪识别由于其强大的性能引起了很多人。大多数现有方法都侧重于提出不同的跨模态融合策略。然而,这些策略在不同模式的特征中引入了冗余,而无需完全考虑模态信息之间的互补特性,并且这些方法不保证在跨跨和间间交互期间的原始语义信息的非损失。在本文中,我们提出了一种基于自我关注和残余结构(CFN-SR)的新型跨模型融合网络,用于多式联情绪识别。首先,我们对音频和视频模型执行表示学习,以通过有效的ResNext和1D CNN获得两个模态的语义特征。其次,我们将两个模态的特征分别馈送到跨模块块中,以确保通过自我关注机制和残余结构来确保信息的有效互补性和完整性。最后,我们通过用原始表示拼接获得的融合表示来获得情绪的产出。为了验证所提出的方法的有效性,我们对Ravdess数据集进行实验。实验结果表明,拟议的CFN-SR实现了最先进的,并以26.30M参数获得75.76%的精度。我们的代码可在https://github.com/skeletonnn/cfn-sr获得。
translated by 谷歌翻译
In this paper, we propose a robust 3D detector, named Cross Modal Transformer (CMT), for end-to-end 3D multi-modal detection. Without explicit view transformation, CMT takes the image and point clouds tokens as inputs and directly outputs accurate 3D bounding boxes. The spatial alignment of multi-modal tokens is performed implicitly, by encoding the 3D points into multi-modal features. The core design of CMT is quite simple while its performance is impressive. CMT obtains 73.0% NDS on nuScenes benchmark. Moreover, CMT has a strong robustness even if the LiDAR is missing. Code will be released at https://github.com/junjie18/CMT.
translated by 谷歌翻译
Given the increasingly intricate forms of partial differential equations (PDEs) in physics and related fields, computationally solving PDEs without analytic solutions inevitably suffers from the trade-off between accuracy and efficiency. Recent advances in neural operators, a kind of mesh-independent neural-network-based PDE solvers, have suggested the dawn of overcoming this challenge. In this emerging direction, Koopman neural operator (KNO) is a representative demonstration and outperforms other state-of-the-art alternatives in terms of accuracy and efficiency. Here we present KoopmanLab, a self-contained and user-friendly PyTorch module of the Koopman neural operator family for solving partial differential equations. Beyond the original version of KNO, we develop multiple new variants of KNO based on different neural network architectures to improve the general applicability of our module. These variants are validated by mesh-independent and long-term prediction experiments implemented on representative PDEs (e.g., the Navier-Stokes equation and the Bateman-Burgers equation) and ERA5 (i.e., one of the largest high-resolution data sets of global-scale climate fields). These demonstrations suggest the potential of KoopmanLab to be considered in diverse applications of partial differential equations.
translated by 谷歌翻译
Rankings are widely collected in various real-life scenarios, leading to the leakage of personal information such as users' preferences on videos or news. To protect rankings, existing works mainly develop privacy protection on a single ranking within a set of ranking or pairwise comparisons of a ranking under the $\epsilon$-differential privacy. This paper proposes a novel notion called $\epsilon$-ranking differential privacy for protecting ranks. We establish the connection between the Mallows model (Mallows, 1957) and the proposed $\epsilon$-ranking differential privacy. This allows us to develop a multistage ranking algorithm to generate synthetic rankings while satisfying the developed $\epsilon$-ranking differential privacy. Theoretical results regarding the utility of synthetic rankings in the downstream tasks, including the inference attack and the personalized ranking tasks, are established. For the inference attack, we quantify how $\epsilon$ affects the estimation of the true ranking based on synthetic rankings. For the personalized ranking task, we consider varying privacy preferences among users and quantify how their privacy preferences affect the consistency in estimating the optimal ranking function. Extensive numerical experiments are carried out to verify the theoretical results and demonstrate the effectiveness of the proposed synthetic ranking algorithm.
translated by 谷歌翻译