自动交通事故检测已吸引机器视觉社区,因为它对自动智能运输系统(ITS)的发展产生了影响和对交通安全的重要性。然而,大多数关于有效分析和交通事故预测的研究都使用了覆盖范围有限的小规模数据集,从而限制了其效果和适用性。交通事故中现有的数据集是小规模,不是来自监视摄像机,而不是开源的,或者不是为高速公路场景建造的。由于在高速公路上发生事故,因此往往会造成严重损坏,并且太快了,无法赶上现场。针对从监视摄像机收集的高速公路交通事故的开源数据集非常需要和实际上。为了帮助视觉社区解决这些缺点,我们努力收集涵盖丰富场景的真实交通事故的视频数据。在通过各个维度进行集成和注释后,在这项工作中提出了一个名为TAD的大规模交通事故数据集。在这项工作中,使用公共主流视觉算法或框架进行了有关图像分类,对象检测和视频分类任务的各种实验,以证明不同方法的性能。拟议的数据集以及实验结果将作为改善计算机视觉研究的新基准提出,尤其是在其中。
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本文介绍了Speakin团队提交的SPEAKER验证(SV)系统,该系统针对2022年远场演讲者验证挑战(FFSVC2022)的任务2和任务2。挑战的SV任务集中在完全监督的远场演讲者验证(任务1)和半监督远场扬声器验证(任务2)的问题上。在任务1中,我们将Voxceleb和FFSVC2020数据集用作火车数据集。对于任务2,我们仅将Voxceleb数据集用作火车集。为此挑战开发了基于重新连接和基于REPVGG的架构。全局统计池结构和MQMHA池结构用于跨时间汇总框架级特征,以获得语音级别的表示。我们采用了Am-Softmax和Aam-Softmax来对产生的嵌入进行分类。我们创新提出了一种分阶段的转移学习方法。在训练阶段,我们保留扬声器的权重,并且在此阶段没有积极的样本来训练它们。然后,我们在第二阶段用正面和负样品微调这些权重。与传统的转移学习策略相比,该策略可以更好地改善模型性能。亚均值和标志的后端方法用于解决域不匹配的问题。在融合阶段,任务1中融合了三个模型,并在任务2中融合了两个模型。在FFSVC2022排行榜上,我们提交的EER为3.0049%,在Task1中,相应的MindCF为0.2938。在任务2中,EER和MindCF分别为6.2060%和0.5232。我们的方法可以提高表现出色,并在两项挑战任务中排名第一。
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本报告描述了我们针对CN-CELEB演讲者识别挑战2022(CNSRC 2022)任务的发言人验证系统。这项挑战包括两项任务,即演讲者验证(SV)和说话者检索(SR)。 SV任务涉及两个轨道:固定轨道和开放轨道。在固定轨道中,我们仅使用CN-CELEB.T作为训练集。对于SV任务和SR任务的开放轨道,我们添加了开源音频数据。为此挑战开发了基于重新连接的基于RESNET,基于REPVGG和基于TDNN的架构。全局统计池结构和MQMHA池结构用于跨时间汇总框架级特征,以获得语音级别的表示。我们采用了Am-Softmax和Aam-Softmax与子中心方法相结合,以对所得的嵌入进行分类。我们还使用了大规模细微调整策略来进一步提高模型性能。在后端,使用了亚均值和雅语。在SV任务固定轨道中,我们的系统是五个型号的融合,并且在SV任务打开轨道中融合了两个型号。我们在SR任务中使用了一个系统。我们的方法带来了卓越的性能,并成为SV任务的开放轨道,在SV任务的固定轨道中的第二名以及SR任务中的第三名。
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Online learning naturally arises in many statistical and machine learning problems. The most widely used methods in online learning are stochastic first-order algorithms. Among this family of algorithms, there is a recently developed algorithm, Recursive One-Over-T SGD (ROOT-SGD). ROOT-SGD is advantageous in that it converges at a non-asymptotically fast rate, and its estimator further converges to a normal distribution. However, this normal distribution has unknown asymptotic covariance; thus cannot be directly applied to measure the uncertainty. To fill this gap, we develop two estimators for the asymptotic covariance of ROOT-SGD. Our covariance estimators are useful for statistical inference in ROOT-SGD. Our first estimator adopts the idea of plug-in. For each unknown component in the formula of the asymptotic covariance, we substitute it with its empirical counterpart. The plug-in estimator converges at the rate $\mathcal{O}(1/\sqrt{t})$, where $t$ is the sample size. Despite its quick convergence, the plug-in estimator has the limitation that it relies on the Hessian of the loss function, which might be unavailable in some cases. Our second estimator is a Hessian-free estimator that overcomes the aforementioned limitation. The Hessian-free estimator uses the random-scaling technique, and we show that it is an asymptotically consistent estimator of the true covariance.
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To address the non-negativity dropout problem of quaternion models, a novel quasi non-negative quaternion matrix factorization (QNQMF) model is presented for color image processing. To implement QNQMF, the quaternion projected gradient algorithm and the quaternion alternating direction method of multipliers are proposed via formulating QNQMF as the non-convex constraint quaternion optimization problems. Some properties of the proposed algorithms are studied. The numerical experiments on the color image reconstruction show that these algorithms encoded on the quaternion perform better than these algorithms encoded on the red, green and blue channels. Furthermore, we apply the proposed algorithms to the color face recognition. Numerical results indicate that the accuracy rate of face recognition on the quaternion model is better than on the red, green and blue channels of color image as well as single channel of gray level images for the same data, when large facial expressions and shooting angle variations are presented.
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Over the past few years, the field of adversarial attack received numerous attention from various researchers with the help of successful attack success rate against well-known deep neural networks that were acknowledged to achieve high classification ability in various tasks. However, majority of the experiments were completed under a single model, which we believe it may not be an ideal case in a real-life situation. In this paper, we introduce a novel federated adversarial training method for smart home face recognition, named FLATS, where we observed some interesting findings that may not be easily noticed in a traditional adversarial attack to federated learning experiments. By applying different variations to the hyperparameters, we have spotted that our method can make the global model to be robust given a starving federated environment. Our code can be found on https://github.com/jcroh0508/FLATS.
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Pre-trained language models allowed us to process downstream tasks with the help of fine-tuning, which aids the model to achieve fairly high accuracy in various Natural Language Processing (NLP) tasks. Such easily-downloaded language models from various websites empowered the public users as well as some major institutions to give a momentum to their real-life application. However, it was recently proven that models become extremely vulnerable when they are backdoor attacked with trigger-inserted poisoned datasets by malicious users. The attackers then redistribute the victim models to the public to attract other users to use them, where the models tend to misclassify when certain triggers are detected within the training sample. In this paper, we will introduce a novel improved textual backdoor defense method, named MSDT, that outperforms the current existing defensive algorithms in specific datasets. The experimental results illustrate that our method can be effective and constructive in terms of defending against backdoor attack in text domain. Code is available at https://github.com/jcroh0508/MSDT.
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在本文中,我们提出了一种有效的统计方法(称为“自适应资源分配库”),以稳健有效地检测热点,以有限的采样资源。我们的主要思想是结合多臂强盗(MAB)和更改点检测方法,以平衡对热点检测资源分配的探索和开发。此外,使用贝叶斯加权更新来更新感染率的后验分布。然后,将上限限制(UCB)用于资源分配和计划。最后,Cusum监视统计数据以检测变化点以及变化位置。为了进行性能评估,我们将所提出方法的性能与文献中的几种基准方法进行了比较,并表明所提出的算法能够达到较低的检测延迟和较高的检测精度。最后,在华盛顿州华盛顿州的县级每日阳性19例案例的实际案例研究中,将此方法应用于热点检测,并以非常有限的分布样本证明了有效性。
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极端分类(XC)试图用最大的标签集中标记标签的子集标记数据点。通过使用稀疏,手工制作的功能的XC方法优越,用密集,学习的数据来进行深度XC,以数据点和标签的形式吸引了很多关注。负挖掘技术已成为所有深XC方法的关键组成部分,使它们可以扩展到数百万个标签。然而,尽管最近进步,但培训具有大型编码器体系结构(例如变形金刚)的深入XC模型仍然具有挑战性。本文确定,流行负面挖掘技术的内存通常迫使小型批量尺寸保持小且缓慢的训练。作为回应,本文介绍了Ngame,这是一种轻巧的迷你批次创建技术,可证明可证明准确的内部负面样品。这使得与现有负面采样技术相比,具有更大的迷你批次培训,提供更快的收敛性和更高的精度。发现Ngame的准确性比各种基准数据集的最先进方法要高16%,以进行极端分类,并且在回答搜索引擎查询以响应用户网页时检索搜索引擎查询更准确3%显示个性化广告。在流行搜索引擎的实时A/B测试中,Ngame在点击率率中的收益最高可达23%。
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在医疗保健诊断过程中常见于多级顺序决策方案。在本文中,开发了一种基于主动学习的方法,以以顺序方式积极收集必要的患者数据。提出的方法中有两份新奇。首先,与只有单级模型的现有序数逻辑回归模型不同,我们将所有阶段的参数估算在一起。其次,假设不同阶段中的共同特征的系数保持一致。该方法的有效性在模拟研究中验证和实际案例研究。与单独且独立地建模数据的基线方法相比,所提出的方法通过62 \%-1838 \%提高了估计效率。对于模拟和测试队列,所提出的方法更有效,稳定,可解释和对参数估计的计算有效。该方法可以很容易地扩展到各种场景,其中可以仅通过必要的信息来顺序地完成决策。
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