Traffic flow prediction is an important part of smart transportation. The goal is to predict future traffic conditions based on historical data recorded by sensors and the traffic network. As the city continues to build, parts of the transportation network will be added or modified. How to accurately predict expanding and evolving long-term streaming networks is of great significance. To this end, we propose a new simulation-based criterion that considers teaching autonomous agents to mimic sensor patterns, planning their next visit based on the sensor's profile (e.g., traffic, speed, occupancy). The data recorded by the sensor is most accurate when the agent can perfectly simulate the sensor's activity pattern. We propose to formulate the problem as a continuous reinforcement learning task, where the agent is the next flow value predictor, the action is the next time-series flow value in the sensor, and the environment state is a dynamically fused representation of the sensor and transportation network. Actions taken by the agent change the environment, which in turn forces the agent's mode to update, while the agent further explores changes in the dynamic traffic network, which helps the agent predict its next visit more accurately. Therefore, we develop a strategy in which sensors and traffic networks update each other and incorporate temporal context to quantify state representations evolving over time.
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Various depth estimation models are now widely used on many mobile and IoT devices for image segmentation, bokeh effect rendering, object tracking and many other mobile tasks. Thus, it is very crucial to have efficient and accurate depth estimation models that can run fast on low-power mobile chipsets. In this Mobile AI challenge, the target was to develop deep learning-based single image depth estimation solutions that can show a real-time performance on IoT platforms and smartphones. For this, the participants used a large-scale RGB-to-depth dataset that was collected with the ZED stereo camera capable to generated depth maps for objects located at up to 50 meters. The runtime of all models was evaluated on the Raspberry Pi 4 platform, where the developed solutions were able to generate VGA resolution depth maps at up to 27 FPS while achieving high fidelity results. All models developed in the challenge are also compatible with any Android or Linux-based mobile devices, their detailed description is provided in this paper.
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The heterogeneity gap problem is the main challenge in cross-modal retrieval. Because cross-modal data (e.g. audiovisual) have different distributions and representations that cannot be directly compared. To bridge the gap between audiovisual modalities, we learn a common subspace for them by utilizing the intrinsic correlation in the natural synchronization of audio-visual data with the aid of annotated labels. TNN-CCCA is the best audio-visual cross-modal retrieval (AV-CMR) model so far, but the model training is sensitive to hard negative samples when learning common subspace by applying triplet loss to predict the relative distance between inputs. In this paper, to reduce the interference of hard negative samples in representation learning, we propose a new AV-CMR model to optimize semantic features by directly predicting labels and then measuring the intrinsic correlation between audio-visual data using complete cross-triple loss. In particular, our model projects audio-visual features into label space by minimizing the distance between predicted label features after feature projection and ground label representations. Moreover, we adopt complete cross-triplet loss to optimize the predicted label features by leveraging the relationship between all possible similarity and dissimilarity semantic information across modalities. The extensive experimental results on two audio-visual double-checked datasets have shown an improvement of approximately 2.1% in terms of average MAP over the current state-of-the-art method TNN-CCCA for the AV-CMR task, which indicates the effectiveness of our proposed model.
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最近,音频驱动的会说话的面部视频产生引起了广泛的关注。但是,很少有研究能够解决这些会说话的面部视频的情感编辑问题,并具有连续可控的表达式,这是行业中强烈的需求。面临的挑战是,与语音有关的表达和与情感有关的表达通常是高度耦合的。同时,由于表达式与其他属性(例如姿势)的耦合,即在每个框架中翻译角色的表达可能会同时改变头部姿势,因此传统的图像到图像翻译方法无法在我们的应用中很好地工作。培训数据分布。在本文中,我们提出了一种高质量的面部表达编辑方法,用于谈话面部视频,使用户可以连续控制编辑视频中的目标情感。我们为该任务提供了一个新的视角,作为运动信息编辑的特殊情况,我们使用3DMM捕获主要的面部运动和由StyleGAN模拟的相关纹理图,以捕获外观细节。两种表示(3DMM和纹理图)都包含情感信息,并且可以通过神经网络进行连续修改,并通过系数/潜在空间平均轻松平滑,从而使我们的方法变得简单而有效。我们还引入了口腔形状的保存损失,以控制唇部同步和编辑表达的夸张程度之间的权衡。广泛的实验和用户研究表明,我们的方法在各种评估标准中实现了最先进的表现。
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室外(OOD)检测是面向任务的对话框系统中的关键组件,旨在确定查询是否不在预定义的支持的意图集之外。事实证明,先前基于软磁性的检测算法对OOD样品被过度自信。在本文中,我们分析了过度自信的OOD来自由于训练和测试分布之间的不匹配而导致的分布不确定性,这使得该模型无法自信地做出预测,因此可能导致异常软磁得分。我们提出了一个贝叶斯OOD检测框架,以使用Monte-Carlo辍学来校准分布不确定性。我们的方法是灵活的,并且可以轻松地插入现有的基于软磁性的基线和增益33.33 \%OOD F1改进,而与MSP相比仅增加了0.41 \%的推理时间。进一步的分析表明,贝叶斯学习对OOD检测的有效性。
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传统意图分类模型基于预定义的意图集,仅识别有限的内域(IND)意图类别。但是用户可以在实用的对话系统中输入室外(OOD)查询。这样的OOD查询可以提供未来改进的方向。在本文中,我们定义了一项新任务,广义意图发现(GID),旨在将IND意图分类器扩展到包括IND和OOD意图在内的开放世界意图集。我们希望在发现和识别新的未标记的OOD类型的同时,同时对一组标记的IND意图类进行分类。我们为不同的应用程序方案构建了三个公共数据集,并提出了两种框架,即基于管道的框架和端到端,以实现未来的工作。此外,我们进行详尽的实验和定性分析,以理解关键挑战,并为未来的GID研究提供新的指导。
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面价/唤醒,表达和动作单元是面部情感分析中的相关任务。但是,由于各种收集的条件,这些任务仅在野外的性能有限。野外情感行为分析的第四次竞争(ABAW)提供了价值/唤醒,表达和动作单元标签的图像。在本文中,我们介绍了多任务学习框架,以增强野外三个相关任务的性能。功能共享和标签融合用于利用它们的关系。我们对提供的培训和验证数据进行实验。
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从合成图像中学习由于标记真实图像的困难而在面部表达识别任务中起着重要作用,并且由于合成图像和真实图像之间存在差距而具有挑战性。第四次情感行为分析在野外竞争增加了挑战,并提供了Aff-Wild2数据集生成的合成图像。在本文中,我们提出了一种手工辅助表达识别方法,以减少合成数据和真实数据之间的差距。我们的方法由两个部分组成:表达识别模块和手部预测模块。表达识别模块提取表达信息,并预测模块预测图像是否包含手。决策模式用于结合两个模块的结果,并使用后延伸来改善结果。F1分数用于验证我们方法的有效性。
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本文为旋转组开发了旋转不变的阵阵卷积,因此(3)可以提炼球形信号的多尺度信息。球形的阵头变换从$ \ mathbb {s}^2 $推广到SO(3)组,该组通过一组紧密的Framelet操作员将球形信号分解为近似和详细的光谱系数。分解和重建过程中的球形信号实现了旋转不变性。基于阵型变换,我们形成了一个带有多个SO(3)一面卷积层的NEDLET近似均值球形CNN(NES)。该网络建立了一个强大的工具,可以提取球形信号的几何不变特征。该模型允许具有多分辨率表示的足够网络可伸缩性。通过小波收缩激活函数学习了强大的信号嵌入,该函数会过滤冗余高通表示,同时保持近似旋转不变性。 NES实现了量子化学回归和宇宙微波背景(CMB)的最新性能,删除重建,这显示了通过高分辨率和多尺度球形信号表示解决科学挑战的巨大潜力。
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从一个非常少数标记的样品中学习新颖的课程引起了机器学习区域的越来越高。最近关于基于元学习或转移学习的基于范例的研究表明,良好特征空间的获取信息可以是在几次拍摄任务上实现有利性能的有效解决方案。在本文中,我们提出了一种简单但有效的范式,该范式解耦了学习特征表示和分类器的任务,并且只能通过典型的传送学习培训策略从基类嵌入体系结构的特征。为了在每个类别内保持跨基地和新类别和辨别能力的泛化能力,我们提出了一种双路径特征学习方案,其有效地结合了与对比特征结构的结构相似性。以这种方式,内部级别对齐和级别的均匀性可以很好地平衡,并且导致性能提高。三个流行基准测试的实验表明,当与简单的基于原型的分类器结合起来时,我们的方法仍然可以在电感或转换推理设置中的标准和广义的几次射击问题达到有希望的结果。
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