季节预测$ \ unicode {x2013} $预测温度和降水量为2至6周$ \ unicode {x2013} $,对于有效的水分配,野火管理,干旱和缓解洪水至关重要。最近的国际研究工作提高了操作动力学模型的亚季节能力,但是温度和降水预测技能仍然很差,部分原因是代表动态模型内大气动力学和物理学的顽固错误。为了应对这些错误,我们引入了一种自适应偏置校正(ABC)方法,该方法将最新的动力学预测与使用机器学习的观察结合在一起。当应用于欧洲中等天气预测中心(ECMWF)的领先的亚季节模型时,ABC将温度预测技能提高了60-90%,在美国的连续美国,降水预测技能提高了40-69%基于Shapley队列的实用工作流程,用于解释ABC技能的提高并根据特定的气候条件识别机遇的高技能窗口。
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我们基准了一个简单学习模型的亚季节预测工具包,该工具包优于操作实践和最先进的机器学习和深度学习方法。这些模型,由Mouatadid等人引入。 (2022),包括(a)气候++,这是气候学的一种适应性替代品,对于降水而言,准确性9%,比美国运营气候预测系统(CFSV2)高9%,熟练250%; (b)CFSV2 ++,一种学习的CFSV2校正,可将温度和降水精度提高7-8%,技能提高50-275%; (c)持久性++是一种增强的持久性模型,将CFSV2预测与滞后测量相结合,以将温度和降水精度提高6-9%,技能提高40-130%。在整个美国,气候++,CFSV2 ++和持久性++工具包始终优于标准气象基准,最先进的机器和深度学习方法,以及欧洲中等范围的天气预报集合中心。
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Document Visual Question Answering (DocVQA) refers to the task of answering questions from document images. Existing work on DocVQA only considers single-page documents. However, in real scenarios documents are mostly composed of multiple pages that should be processed altogether. In this work we extend DocVQA to the multi-page scenario. For that, we first create a new dataset, MP-DocVQA, where questions are posed over multi-page documents instead of single pages. Second, we propose a new hierarchical method, Hi-VT5, based on the T5 architecture, that overcomes the limitations of current methods to process long multi-page documents. The proposed method is based on a hierarchical transformer architecture where the encoder summarizes the most relevant information of every page and then, the decoder takes this summarized information to generate the final answer. Through extensive experimentation, we demonstrate that our method is able, in a single stage, to answer the questions and provide the page that contains the relevant information to find the answer, which can be used as a kind of explainability measure.
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Hyperspectral Imaging (HSI) provides detailed spectral information and has been utilised in many real-world applications. This work introduces an HSI dataset of building facades in a light industry environment with the aim of classifying different building materials in a scene. The dataset is called the Light Industrial Building HSI (LIB-HSI) dataset. This dataset consists of nine categories and 44 classes. In this study, we investigated deep learning based semantic segmentation algorithms on RGB and hyperspectral images to classify various building materials, such as timber, brick and concrete.
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Scene text images have different shapes and are subjected to various distortions, e.g. perspective distortions. To handle these challenges, the state-of-the-art methods rely on a rectification network, which is connected to the text recognition network. They form a linear pipeline which uses text rectification on all input images, even for images that can be recognized without it. Undoubtedly, the rectification network improves the overall text recognition performance. However, in some cases, the rectification network generates unnecessary distortions on images, resulting in incorrect predictions in images that would have otherwise been correct without it. In order to alleviate the unnecessary distortions, the portmanteauing of features is proposed. The portmanteau feature, inspired by the portmanteau word, is a feature containing information from both the original text image and the rectified image. To generate the portmanteau feature, a non-linear input pipeline with a block matrix initialization is presented. In this work, the transformer is chosen as the recognition network due to its utilization of attention and inherent parallelism, which can effectively handle the portmanteau feature. The proposed method is examined on 6 benchmarks and compared with 13 state-of-the-art methods. The experimental results show that the proposed method outperforms the state-of-the-art methods on various of the benchmarks.
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This paper computationally demonstrates a sharp improvement in predictive performance for $k$ nearest neighbors thanks to an efficient forward selection of the predictor variables. We show both simulated and real-world data that this novel repeatedly approaches outperformance regression models under stepwise selection
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培训和评估机器学习模型的迭代是提高其性能的重要过程。但是,尽管可教学的接口使盲人用户能够在其独特的环境中拍摄的照片训练和测试对象识别器,但训练迭代和评估步骤的可访问性很少受到关注。迭代假设训练照片的目视检查,对于盲人用户来说是无法访问的。我们通过MyCam探索了这一挑战,Mycam是一个移动应用程序,该应用程序合并了自动估计的描述符,以在用户培训集中对照片进行非视觉访问。我们探索盲人参与者(n = 12)如何通过他们的家中的评估研究与mycam和描述符相互作用。我们证明,实时照片级描述符使盲人用户能够用裁剪的对象减少照片,并且参与者可以通过迭代并访问其训练集的质量来增加更多的变化。此外,参与者发现该应用程序易于使用,表明他们可以有效地训练它,并且描述符很有用。但是,主观反应并未反映在其模型的性能中,部分原因是训练和混乱背景的变化很小。
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Drori等。(2022)报告说:“神经网络通过计划的综合来解决,解释和产生大学数学问题,在人类层面上学习很少……[它]自动回答了81 \%的大学级数学问题。”他们描述的系统确实令人印象深刻。但是,上述描述夸大了。解决问题的工作不是由神经网络而是由符号代数软件包Sympy完成的。各种格式的问题被排除在考虑之外。所谓的“说明”只是代码行的重新词。答案被标记为问题中未指定的形式的正确。最严重的是,似乎在许多情况下,系统使用测试语料库中给出的正确答案来指导其解决问题的道路。
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致命疾病作为关键健康发作(CHE),代表了在重症监护病房住院的患者的真正危险。这些发作会导致不可逆转的器官损坏和死亡。然而,及时诊断它们会大大减少他们的不便。因此,这项研究的重点是建立一个高效的预警系统,用于急性低血压发作和心动过速发作。为了促进预测的早熟,在观察期(观察窗口)和可能发生关键事件的时期(目标窗口)之间考虑了一小时的差距。模拟II数据集用于评估所提出系统的性能。该系统首先包括使用三种不同模式提取其他功能。然后,使用相互信息增益特征的特征进行选择,允许选择最相关的功能的功能选择过程。最后,使用高性能预测模型LightGBM进行发作分类。使用五个不同的指标评估了这种称为MIG-LightGBM的方法:事件召回(ER),精度降低(RP),平均预期时间(Aveat),平均错误警报(AVEFA)和事件F1得分(EF1得分)。因此,如果CHE的早期预测不仅表现出大型助攻,而且还具有较大的EF1得分和低AVEFA,则认为一种方法对于早期的预测被认为是高效的。与使用极端梯度增强的系统相比,支持向量分类或天真的贝叶斯作为预测模型,发现该系统高度主导。它还证实了其优于分层学习方法。
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估计变量的重要性是现代机器学习的重要任务。这有助于评估给定模型中功能的优点。在过去的十年中,已经开发了几种估计变量重要性的技术。在本文中,我们提出了对可变重要性估计的新兴方法的计算和理论探索,即:绝对收缩和选择操作员(LASSO),支持向量机(SVM),预测误差函数(Perf),随机森林(随机森林)( RF)和极端梯度提升(XGBOOST)在不同类型的现实生活和模拟数据上进行了测试。所有这些方法都可以无缝处理回归和分类任务,但是在处理包含丢失值的数据时都失败了。该实现表明,在高度相关数据的情况下,PURD具有最佳性能,紧随其后的是RF。 perf和xgboost是“渴望数据”的方法,它们在小数据尺寸上的性能最差,但在执行时间方面它们是最快的。当数据集中许多冗余功能时,SVM是最合适的。 perf的盈余是其自然截止量的零截止,有助于将正面和负分数分开,所有正分数表明基本和重要的特征,而负面分数表示无用的特征。 RF和Lasso的通用性非常多,尽管它们没有给予最佳效果,但它们几乎可以在所有情况下使用。
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