高级深度学习(DL)算法可以预测患者基于乳房成像报告和数据系统(BI-RAD)和密度标准的患者发育乳腺癌的风险。最近的研究表明,多视图分析的结合改善了整体乳房考试分类。在本文中,我们提出了一种新的多视图DL方法,用于乳房X线照片的Bi-RAD和密度评估。所提出的方法首先部署深度卷积网络,用于分别对每个视图进行特征提取。然后将提取的特征堆叠并馈入光梯度升压机(LightGBM)分类器中以预测Bi-RAD和密度分数。我们对内部乳房数据集和公共数据集数字数据库进行广泛的实验,用于筛选乳房X线摄影(DDSM)。实验结果表明,所提出的方法在两个基准数据集中突出了巨大的边距(内部数据集5%,DDSM数据集10%)优于两个基准分类方法。这些结果突出了组合多视图信息来改善乳腺癌风险预测性能的重要作用。
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分析了2011年至2021年发表的88个来源,本文对基于计算机的建筑物和建筑环境进行了首次系统评价,以评估其对建筑和城市设计研究的价值。遵循多阶段的选择过程,讨论了有关建筑应用,例如建筑物分类,详细分类,定性环境分析,建筑条件调查和建筑价值估算等建筑应用程序的类型。这揭示了当前的研究差距和趋势,并突出了研究目标的两个主要类别。首先,要使用或优化计算机视觉方法进行体系结构图像数据,然后可以帮助自动化耗时,劳动密集型或复杂的视觉分析任务。其次,通过查找视觉,统计和定性数据之间的模式和关系来探索机器学习方法的方法论上的好处,以研究有关建筑环境的新问题,这可以克服传统手动分析的局限性。不断增长的研究为建筑和设计研究提供了新的方法,论文确定了未来的研究挑战和方向。
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语言模型既展示了定量的改进,又展示了新的定性功能,随着规模的增加。尽管它们具有潜在的变革性影响,但这些新能力的特征却很差。为了为未来的研究提供信息,为破坏性的新模型能力做准备,并改善社会有害的效果,至关重要的是,我们必须了解目前和近乎未来的能力和语言模型的局限性。为了应对这一挑战,我们介绍了超越模仿游戏基准(Big Bench)。 Big Bench目前由204个任务组成,由132家机构的442位作者贡献。任务主题是多样的,从语言学,儿童发展,数学,常识性推理,生物学,物理学,社会偏见,软件开发等等。 Big-Bench专注于被认为超出当前语言模型的功能的任务。我们评估了OpenAI的GPT型号,Google内部密集变压器体系结构和大型基础上的开关稀疏变压器的行为,跨越了数百万到数十亿个参数。此外,一个人类专家评估者团队执行了所有任务,以提供强大的基准。研究结果包括:模型性能和校准都随规模改善,但绝对的术语(以及与评估者的性能相比);在模型类中的性能非常相似,尽管带有稀疏性。逐渐和预测的任务通常涉及大量知识或记忆成分,而在临界规模上表现出“突破性”行为的任务通常涉及多个步骤或组成部分或脆性指标;社交偏见通常会随着含糊不清的环境而随着规模而增加,但这可以通过提示来改善。
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我们提出了一个用于视频中时间精确的动作发现的模型,该模型使用一组密集的检测锚,预测了每个锚的检测置信度和相应的细粒时间位移。我们尝试两个行李箱体系结构,两者都能够合并大的时间上下文,同时保留精确本地化所需的较小规模的功能:U-NET的一维版本和变压器编码器(TE)。我们还建议通过应用清晰度最小化(SAM)和混合数据扩展来提出这种培训模型的最佳实践。我们在Soccernet-V2上实现了新的最新技术,这是同类的最大足球视频数据集,其时间定位明显改善。此外,我们的消融表明:预测时间位移的重要性;U-Net和TE Trunks之间的权衡;以及与SAM和MIDUP培训的好处。
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现代软件系统和产品越来越依赖机器学习模型,以基于与用户和系统的交互进行数据驱动的决策,例如计算基础架构。对于更广泛的采用,这种做法必须(i)容纳没有ML背景的软件工程师,并提供(ii)提供优化产品目标的机制。在这项工作中,我们描述了一般原则和特定的端到端毫升平台,为决策和反馈集合提供易于使用的API。循环仪支持从在线数据收集到模拟培训,部署,推理的完整端到端ML生命周期,并扩展支持和调整产品目标的评估和调整。我们概述了平台架构和生产部署的整体影响 - 循环仪当前托管700毫升型号,每秒达到600万决定。我们还描述了学习曲线并总结了平台采用者的经验。
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Pennylane是用于量子计算机可区分编程的Python 3软件框架。该库为近期量子计算设备提供了统一的体系结构,支持量子和连续变化的范例。 Pennylane的核心特征是能够以与经典技术(例如反向传播)兼容的方式来计算变异量子电路的梯度。因此,Pennylane扩展了在优化和机器学习中常见的自动分化算法,以包括量子和混合计算。插件系统使该框架与任何基于门的量子模拟器或硬件兼容。我们为硬件提供商提供插件,包括Xanadu Cloud,Amazon Braket和IBM Quantum,允许Pennylane优化在公开访问的量子设备上运行。在古典方面,Pennylane与加速的机器学习库(例如Tensorflow,Pytorch,Jax和Autograd)接口。 Pennylane可用于优化变分的量子本素体,量子近似优化,量子机学习模型和许多其他应用。
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Camera relocalization involving a prior 3D reconstruction plays a crucial role in many mixed reality and robotics applications. Estimating the camera pose directly with respect to pre-built 3D models can be prohibitively expensive for several applications with limited storage and/or communication bandwidth. Although recent scene and absolute pose regression methods have become popular for efficient camera localization, most of them are computation-resource intensive and difficult to obtain a real-time inference with high accuracy constraints. This study proposes a simple scene regression method that requires only a multi-layer perceptron network for mapping scene coordinates to achieve accurate camera pose estimations. The proposed approach uses sparse descriptors to regress the scene coordinates, instead of a dense RGB image. The use of sparse features provides several advantages. First, the proposed regressor network is substantially smaller than those reported in previous studies. This makes our system highly efficient and scalable. Second, the pre-built 3D models provide the most reliable and robust 2D-3D matches. Therefore, learning from them can lead to an awareness of equivalent features and substantially improve the generalization performance. A detailed analysis of our approach and extensive evaluations using existing datasets are provided to support the proposed method. The implementation detail is available at https://github.com/aislab/feat2map
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The ability for an agent to continuously learn new skills without catastrophically forgetting existing knowledge is of critical importance for the development of generally intelligent agents. Most methods devised to address this problem depend heavily on well-defined task boundaries, and thus depend on human supervision. Our task-agnostic method, Self-Activating Neural Ensembles (SANE), uses a modular architecture designed to avoid catastrophic forgetting without making any such assumptions. At the beginning of each trajectory, a module in the SANE ensemble is activated to determine the agent's next policy. During training, new modules are created as needed and only activated modules are updated to ensure that unused modules remain unchanged. This system enables our method to retain and leverage old skills, while growing and learning new ones. We demonstrate our approach on visually rich procedurally generated environments.
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Real-world datasets exhibit imbalances of varying types and degrees. Several techniques based on re-weighting and margin adjustment of loss are often used to enhance the performance of neural networks, particularly on minority classes. In this work, we analyze the class-imbalanced learning problem by examining the loss landscape of neural networks trained with re-weighting and margin-based techniques. Specifically, we examine the spectral density of Hessian of class-wise loss, through which we observe that the network weights converge to a saddle point in the loss landscapes of minority classes. Following this observation, we also find that optimization methods designed to escape from saddle points can be effectively used to improve generalization on minority classes. We further theoretically and empirically demonstrate that Sharpness-Aware Minimization (SAM), a recent technique that encourages convergence to a flat minima, can be effectively used to escape saddle points for minority classes. Using SAM results in a 6.2\% increase in accuracy on the minority classes over the state-of-the-art Vector Scaling Loss, leading to an overall average increase of 4\% across imbalanced datasets. The code is available at: https://github.com/val-iisc/Saddle-LongTail.
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In this paper, we present the Circular Accessible Depth (CAD), a robust traversability representation for an unmanned ground vehicle (UGV) to learn traversability in various scenarios containing irregular obstacles. To predict CAD, we propose a neural network, namely CADNet, with an attention-based multi-frame point cloud fusion module, Stability-Attention Module (SAM), to encode the spatial features from point clouds captured by LiDAR. CAD is designed based on the polar coordinate system and focuses on predicting the border of traversable area. Since it encodes the spatial information of the surrounding environment, which enables a semi-supervised learning for the CADNet, and thus desirably avoids annotating a large amount of data. Extensive experiments demonstrate that CAD outperforms baselines in terms of robustness and precision. We also implement our method on a real UGV and show that it performs well in real-world scenarios.
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