To facilitate the analysis of human actions, interactions and emotions, we compute a 3D model of human body pose, hand pose, and facial expression from a single monocular image. To achieve this, we use thousands of 3D scans to train a new, unified, 3D model of the human body, SMPL-X, that extends SMPL with fully articulated hands and an expressive face. Learning to regress the parameters of SMPL-X directly from images is challenging without paired images and 3D ground truth. Consequently, we follow the approach of SMPLify, which estimates 2D features and then optimizes model parameters to fit the features. We improve on SMPLify in several significant ways: (1) we detect 2D features corresponding to the face, hands, and feet and fit the full SMPL-X model to these; (2) we train a new neural network pose prior using a large MoCap dataset; (3) we define a new interpenetration penalty that is both fast and accurate; (4) we automatically detect gender and the appropriate body models (male, female, or neutral); (5) our PyTorch implementation achieves a speedup of more than 8× over Chumpy. We use the new method, SMPLify-X, to fit SMPL-X to both controlled images and images in the wild. We evaluate 3D accuracy on a new curated dataset comprising 100 images with pseudo ground-truth. This is a step towards automatic expressive human capture from monocular RGB data. The models, code, and data are available for research purposes at https://smpl-x.is.tue.mpg.de.

and ACCAD [5] datasets. The input is sparse markers and the output is SMPL body models.

With the progress of sensor technology in wearables, the collection and analysis of PPG signals are gaining more interest. Using Machine Learning, the cardiac rhythm corresponding to PPG signals can be used to predict different tasks such as activity recognition, sleep stage detection, or more general health status. However, supervised learning is often limited by the amount of available labeled data, which is typically expensive to obtain. To address this problem, we propose a Self-Supervised Learning (SSL) method with a pretext task of signal reconstruction to learn an informative generalized PPG representation. The performance of the proposed SSL framework is compared with two fully supervised baselines. The results show that in a very limited label data setting (10 samples per class or less), using SSL is beneficial, and a simple classifier trained on SSL-learned representations outperforms fully supervised deep neural networks. However, the results reveal that the SSL-learned representations are too focused on encoding the subjects. Unfortunately, there is high inter-subject variability in the SSL-learned representations, which makes working with this data more challenging when labeled data is scarce. The high inter-subject variability suggests that there is still room for improvements in learning representations. In general, the results suggest that SSL may pave the way for the broader use of machine learning models on PPG data in label-scarce regimes.

Graph neural networks (GNNs) have been utilized for various natural language processing (NLP) tasks lately. The ability to encode corpus-wide features in graph representation made GNN models popular in various tasks such as document classification. One major shortcoming of such models is that they mainly work on homogeneous graphs, while representing text datasets as graphs requires several node types which leads to a heterogeneous schema. In this paper, we propose a transductive hybrid approach composed of an unsupervised node representation learning model followed by a node classification/edge prediction model. The proposed model is capable of processing heterogeneous graphs to produce unified node embeddings which are then utilized for node classification or link prediction as the downstream task. The proposed model is developed to classify stock market technical analysis reports, which to our knowledge is the first work in this domain. Experiments, which are carried away using a constructed dataset, demonstrate the ability of the model in embedding extraction and the downstream tasks.

In this paper, we propose a robust election simulation model and independently developed election anomaly detection algorithm that demonstrates the simulation's utility. The simulation generates artificial elections with similar properties and trends as elections from the real world, while giving users control and knowledge over all the important components of the elections. We generate a clean election results dataset without fraud as well as datasets with varying degrees of fraud. We then measure how well the algorithm is able to successfully detect the level of fraud present. The algorithm determines how similar actual election results are as compared to the predicted results from polling and a regression model of other regions that have similar demographics. We use k-means to partition electoral regions into clusters such that demographic homogeneity is maximized among clusters. We then use a novelty detection algorithm implemented as a one-class Support Vector Machine where the clean data is provided in the form of polling predictions and regression predictions. The regression predictions are built from the actual data in such a way that the data supervises itself. We show both the effectiveness of the simulation technique and the machine learning model in its success in identifying fraudulent regions.

This letter explains an algorithm for finding a set of base functions. The method aims to capture the leading behavior of the dataset in terms of a few base functions. Implementation of the A-star search will help find these functions, while the gradient descent optimizes the parameters of the functions at each search step. We will show the resulting plots to compare the extrapolation with the unseen data.

共处的触觉传感是一种基本的启发技术，用于灵巧操纵。然而，可变形的传感器在机器人，握住的对象和环境之间引入了复杂的动力学，必须考虑进行精细操纵。在这里，我们提出了一种学习软触觉传感器膜动力学的方法，该动力学解释了由握把对象和环境之间的物理相互作用引起的传感器变形。我们的方法将膜的感知3D几何形状与本体感受反应扳手结合在一起，以预测以机器人作用为条件的未来变形。从膜的几何形状和反应扳手中回收了抓握的物体姿势，从触觉观察模型中解耦相互作用动力学。我们在两个现实世界的接触任务上基准了我们的方法：用握把标记和手中旋转的绘画。我们的结果表明，明确建模膜动力学比基准实现了更好的任务性能和对看不见的对象的概括。

在本文中，我们提出了一种算法，以在动态场景的两对图像之间插值。尽管在过去的几年中，在框架插值方面取得了重大进展，但当前的方法无法处理具有亮度和照明变化的图像，即使很快将图像捕获也很常见。我们建议通过利用现有的光流方法来解决这个问题，这些方法对照明的变化非常健壮。具体而言，使用使用现有预训练的流动网络估算的双向流，我们预测了从中间帧到两个输入图像的流。为此，我们建议将双向流编码为由超网络提供动力的基于坐标的网络，以获得跨时间的连续表示流。一旦获得了估计的流，我们就会在现有的混合网络中使用它们来获得最终的中间帧。通过广泛的实验，我们证明我们的方法能够比最新的框架插值算法产生明显更好的结果。

最近的研究提出了一系列针对深度任务模型的专业优化算法。通常声称这些多任务优化（MTO）方法产生的解决方案优于仅通过优化任务损失的加权平均值而获得的解决方案。在本文中，我们对各种语言和视觉任务进行大规模实验，以检查这些主张的经验有效性。我们表明，尽管这些算法的设计和计算复杂性增加了，但MTO方法并未产生超出传统优化方法可实现的性能的任何改进。我们强调了替代策略，这些策略始终如一地提高性能概况，并指出可能导致次优效果的常见训练陷阱。最后，我们概述了可靠地评估MTO算法的性能并讨论潜在解决方案的挑战。

深入强化学习（DRL）用于开发自主优化和定制设计的热处理过程，这些过程既对微观结构敏感又节能。与常规监督的机器学习不同，DRL不仅依赖于数据中的静态神经网络培训，但是学习代理人会根据奖励和惩罚元素自主开发最佳解决方案，并减少或没有监督。在我们的方法中，依赖温度的艾伦 - 卡恩模型用于相转换，用作DRL代理的环境，是其获得经验并采取自主决策的模型世界。 DRL算法的试剂正在控制系统的温度，作为用于合金热处理的模型炉。根据所需的相位微观结构为代理定义了微观结构目标。训练后，代理可以为各种初始微观结构状态生成温度时间曲线，以达到最终所需的微观结构状态。详细研究了代理商的性能和热处理概况的物理含义。特别是，该试剂能够控制温度以从各种初始条件开始达到所需的微观结构。代理在处理各种条件方面的这种能力为使用这种方法铺平了道路，也用于回收的导向热处理过程设计，由于杂质的侵入，初始组合物可能因批量而异，以及用于设计节能热处理。为了检验这一假设，将无罚款的代理人与考虑能源成本的代理人进行了比较。对能源成本的罚款是针对找到最佳温度时间剖面的代理的附加标准。