我们提出了一种新方案,以补偿粒子网(PM)方案产生的小规模近似值。这种模拟是大规模结构的快速和低计算成本实现,但缺乏小规模的分辨率。为了提高其准确性,我们在模拟的微分方程中引入了额外的有效力,该方程是由作用于PM估计的引力电位的傅立叶空间神经网络参数化的。我们将获得功率谱的结果与PGD方案(潜在梯度下降方案)获得的结果进行了比较。我们注意到功率谱的项有类似的改进,但是我们发现我们的方法在互相关系数方面的表现优于PGD,并且对模拟设置的变化(不同的分辨率,不同的宇宙学)的变化更为强大。
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Previous attempts to predict stock price from limit order book (LOB) data are mostly based on deep convolutional neural networks. Although convolutions offer efficiency by restricting their operations to local interactions, it is at the cost of potentially missing out on the detection of long-range dependencies. Recent studies address this problem by employing additional recurrent or attention layers that increase computational complexity. In this work, we propose Axial-LOB, a novel fully-attentional deep learning architecture for predicting price movements of stocks from LOB data. By utilizing gated position-sensitive axial attention layers our architecture is able to construct feature maps that incorporate global interactions, while significantly reducing the size of the parameter space. Unlike previous works, Axial-LOB does not rely on hand-crafted convolutional kernels and hence has stable performance under input permutations and the capacity to incorporate additional LOB features. The effectiveness of Axial-LOB is demonstrated on a large benchmark dataset, containing time series representations of millions of high-frequency trading events, where our model establishes a new state of the art, achieving an excellent directional classification performance at all tested prediction horizons.
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This paper presents a learning framework to estimate an agent capability and task requirement model for multi-agent task allocation. With a set of team configurations and the corresponding task performances as the training data, linear task constraints can be learned to be embedded in many existing optimization-based task allocation frameworks. Comprehensive computational evaluations are conducted to test the scalability and prediction accuracy of the learning framework with a limited number of team configurations and performance pairs. A ROS and Gazebo-based simulation environment is developed to validate the proposed requirements learning and task allocation framework in practical multi-agent exploration and manipulation tasks. Results show that the learning process for scenarios with 40 tasks and 6 types of agents uses around 12 seconds, ending up with prediction errors in the range of 0.5-2%.
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在神经网络应用中,不足的培训样本是一个常见的问题。尽管数据增强方法至少需要最少数量的样本,但我们提出了一种基于新颖的,基于渲染的管道来合成带注释的数据集。我们的方法不会修改现有样本,而是合成全新样本。提出的基于渲染的管道能够在全自动过程中生成和注释合成和部分真实的图像和视频数据。此外,管道可以帮助获取真实数据。拟议的管道基于渲染过程。此过程生成综合数据。部分实现的数据使合成序列通过在采集过程中合并真实摄像机使综合序列更接近现实。在自动车牌识别的背景下,广泛的实验验证证明了拟议的数据生成管道的好处,尤其是对于具有有限的可用培训数据的机器学习方案。与仅在实际数据集中训练的OCR算法相比,该实验表明,角色错误率和错过率分别从73.74%和100%和14.11%和41.27%降低。这些改进是通过仅对合成数据训练算法来实现的。当另外合并真实数据时,错误率可以进一步降低。因此,角色错误率和遗漏率可以分别降低至11.90%和39.88%。在实验过程中使用的所有数据以及针对自动数据生成的拟议基于渲染的管道公开可用(URL将在出版时揭示)。
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我们提出了一个新颖的输出层激活函数,我们将其命名为ASTRA(不对称的Sigmoid转移函数),该功能使少数族裔示例的分类在高度不平衡的情况下,更可拖延。我们将其与损失函数相结合,有助于有效地靶向少数族裔错误分类。这两种方法可以一起使用,也可以分别使用,建议将其组合用于最严重的不平衡情况。提出的方法在IRS上进行了588.24至4000的数据集测试,并且很少有少数案例(在某些数据集中,只有五个)。在最近的一项部署了广泛的复杂,混合数据级的集合分类器的最新研究中,使用两到12个隐藏单元的神经网络的结果与获得的等效结果相当或更好。
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公开演讲期间的压力很普遍,会对绩效和自信产生不利影响。已经进行了广泛的研究以开发各种模型以识别情绪状态。但是,已经进行了最少的研究,以实时使用语音分析来检测公众演讲期间的压力。在这种情况下,当前的审查表明,算法的应用未正确探索,并有助于确定创建合适的测试环境的主要障碍,同时考虑当前的复杂性和局限性。在本文中,我们介绍了我们的主要思想,并提出了一个应力检测计算算法模型,该模型可以集成到虚拟现实(VR)应用程序中,以创建一个智能的虚拟受众,以提高公开讲话技能。当与VR集成时,开发的模型将能够通过分析与指示压力的生理参数相关的语音功能来实时检测过度压力,并帮助用户逐渐控制过度的压力并改善公众演讲表现
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法医车牌识别(FLPR)仍然是在法律环境(例如刑事调查)中的公开挑战,在刑事调查中,不可读取的车牌(LPS)需要从高度压缩和/或低分辨率录像(例如监视摄像机)中解密。在这项工作中,我们提出了一个侧面信息变压器体系结构,该结构嵌入了输入压缩级别的知识,以改善在强压缩下的识别。我们在低质量的现实世界数据集上显示了变压器对车牌识别(LPR)的有效性。我们还提供了一个合成数据集,其中包括强烈退化,难以辨认的LP图像并分析嵌入知识对其的影响。该网络的表现优于现有的FLPR方法和标准最先进的图像识别模型,同时需要更少的参数。对于最严重的降级图像,我们可以将识别提高多达8.9%。
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免费可用且易于使用的音频编辑工具使执行音频剪接变得直接。可以通过结合同一人的各种语音样本来说服伪造。在考虑错误信息时,在公共部门都很重要,并且在法律背景下以验证证据的完整性很重要。不幸的是,用于音频剪接的大多数现有检测算法都使用手工制作的功能并做出特定的假设。但是,刑事调查人员经常面临来自未知特征不明的来源的音频样本,这增加了对更普遍适用的方法的需求。通过这项工作,我们的目标是朝着不受限制的音频剪接检测迈出第一步,以满足这一需求。我们以可能掩盖剪接的后处理操作的形式模拟各种攻击方案。我们提出了一个用于剪接检测和定位的变压器序列到序列(SEQ2SEQ)网络。我们的广泛评估表明,所提出的方法的表现优于现有的剪接检测方法[3,10]以及通用网络效率网络[28]和regnet [25]。
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Finding discriminant functions of minimum risk binary classification systems is a novel geometric locus problem -- which requires solving a system of fundamental locus equations of binary classification -- subject to deep-seated statistical laws. We show that a discriminant function of a minimum risk binary classification system is the solution of a locus equation that represents the geometric locus of the decision boundary of the system, wherein the discriminant function is connected to the decision boundary by an exclusive principal eigen-coordinate system -- at which point the discriminant function is represented by a geometric locus of a novel principal eigenaxis -- structured as a dual locus of likelihood components and principal eigenaxis components. We demonstrate that a minimum risk binary classification system acts to jointly minimize its eigenenergy and risk by locating a point of equilibrium, at which point critical minimum eigenenergies exhibited by the system are symmetrically concentrated in such a manner that the novel principal eigenaxis of the system exhibits symmetrical dimensions and densities, so that counteracting and opposing forces and influences of the system are symmetrically balanced with each other -- about the geometric center of the locus of the novel principal eigenaxis -- whereon the statistical fulcrum of the system is located. Thereby, a minimum risk binary classification system satisfies a state of statistical equilibrium -- so that the total allowed eigenenergy and the expected risk exhibited by the system are jointly minimized within the decision space of the system -- at which point the system exhibits the minimum probability of classification error.
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概念漂移过程挖掘(PM)是一种挑战,因为古典方法假设进程处于稳态,即事件共享相同的进程版本。我们对这些领域的交叉点进行了系统的文献综述,从而审查了过程采矿中的概念漂移,并提出了用于漂移检测和在线流程挖掘的现有技术的分类,以实现不断发展的环境。现有的作品描绘了(i)PM仍然主要关注离线分析,并且(ii)由于缺乏公共评估协议,数据集和指标,过程中的概念漂移技术的评估是麻烦的。
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