An enhanced geothermal system is essential to provide sustainable and long-term geothermal energy supplies and reduce carbon emissions. Optimal well-control scheme for effective heat extraction and improved heat sweep efficiency plays a significant role in geothermal development. However, the optimization performance of most existing optimization algorithms deteriorates as dimension increases. To solve this issue, a novel surrogate-assisted level-based learning evolutionary search algorithm (SLLES) is proposed for heat extraction optimization of enhanced geothermal system. SLLES consists of classifier-assisted level-based learning pre-screen part and local evolutionary search part. The cooperation of the two parts has realized the balance between the exploration and exploitation during the optimization process. After iteratively sampling from the design space, the robustness and effectiveness of the algorithm are proven to be improved significantly. To the best of our knowledge, the proposed algorithm holds state-of-the-art simulation-involved optimization framework. Comparative experiments have been conducted on benchmark functions, a two-dimensional fractured reservoir and a three-dimensional enhanced geothermal system. The proposed algorithm outperforms other five state-of-the-art surrogate-assisted algorithms on all selected benchmark functions. The results on the two heat extraction cases also demonstrate that SLLES can achieve superior optimization performance compared with traditional evolutionary algorithm and other surrogate-assisted algorithms. This work lays a solid basis for efficient geothermal extraction of enhanced geothermal system and sheds light on the model management strategies of data-driven optimization in the areas of energy exploitation.
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Proper functioning of connected and automated vehicles (CAVs) is crucial for the safety and efficiency of future intelligent transport systems. Meanwhile, transitioning to fully autonomous driving requires a long period of mixed autonomy traffic, including both CAVs and human-driven vehicles. Thus, collaboration decision-making for CAVs is essential to generate appropriate driving behaviors to enhance the safety and efficiency of mixed autonomy traffic. In recent years, deep reinforcement learning (DRL) has been widely used in solving decision-making problems. However, the existing DRL-based methods have been mainly focused on solving the decision-making of a single CAV. Using the existing DRL-based methods in mixed autonomy traffic cannot accurately represent the mutual effects of vehicles and model dynamic traffic environments. To address these shortcomings, this article proposes a graph reinforcement learning (GRL) approach for multi-agent decision-making of CAVs in mixed autonomy traffic. First, a generic and modular GRL framework is designed. Then, a systematic review of DRL and GRL methods is presented, focusing on the problems addressed in recent research. Moreover, a comparative study on different GRL methods is further proposed based on the designed framework to verify the effectiveness of GRL methods. Results show that the GRL methods can well optimize the performance of multi-agent decision-making for CAVs in mixed autonomy traffic compared to the DRL methods. Finally, challenges and future research directions are summarized. This study can provide a valuable research reference for solving the multi-agent decision-making problems of CAVs in mixed autonomy traffic and can promote the implementation of GRL-based methods into intelligent transportation systems. The source code of our work can be found at https://github.com/Jacklinkk/Graph_CAVs.
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众所周知,由出色的文档级神经机器翻译(NMT)模型产生的翻译是一致且连贯的。但是,像BLEU这样的现有句子级评估指标几乎无法反映模型在文档级别的性能。为了解决这个问题,我们在本文中提出了一种话语凝聚评估方法(DCOEM),并贡献了一个新的测试套件,该套件考虑了四个凝聚力的方式(参考,连接,替代和词汇凝聚力),以衡量文档翻译的凝聚力。最近的文档级NMT系统的评估结果表明,我们的方法在估计文档级别的翻译方面是实用且至关重要的。
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最佳的井位置和井注射生产对于储层开发至关重要,以最大程度地利用项目寿命。荟萃分析算法在解决复杂,非线性和非连续优化问题方面表现出良好的性能。但是,在优化过程中涉及大量数值模拟运行。在这项工作中,提出了一种新颖,有效的数据驱动的进化算法,称为通用数据驱动的差异进化算法(GDDE),以减少在良好的设置和控制优化问题上运行的模拟数量。概率神经网络(PNN)被用作选择信息性和有前途的候选者的分类器,并且基于欧几里得距离的最不确定的候选者被预先筛选并使用数值模拟器进行评估。随后,局部替代模型是通过径向基函数(RBF)构建的,优化器发现的替代物的最佳构建,由数值模拟器评估以加速收敛。值得注意的是,RBF模型和PNN的形状因子是通过解决高参数次级优化的优化问题来优化的。结果表明,这项研究中提出的优化算法对于二维储层和卵模型的关节优化的良好选择优化问题非常有前途。
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知识图表(KGS)是真实世界事实的结构化表示,是融合人类知识的智能数据库,可以帮助机器模仿人类问题的方法。然而,由于快速迭代的性质以及数据的不完整,KGs通常是巨大的,并且在公斤上有不可避免的事实。对于知识图链接的预测是针对基于现有的知识推理来完成缺少事实的任务。广泛研究了两个主要的研究流:一个学习可以捕获潜在模式的实体和关系的低维嵌入,以及通过采矿逻辑规则的良好解释性。不幸的是,以前的研究很少关注异质的KG。在本文中,我们提出了一种将基于嵌入的学习和逻辑规则挖掘结合的模型,以推断在KG上。具体地,我们研究了从节点程度的角度涉及各种类型的实体和关系的异构kg中的缺失链接的问题。在实验中,我们证明了我们的DegreEmbed模型优于对现实世界的数据集的国家的最先进的方法。同时,我们模型开采的规则具有高质量和可解释性。
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大型知识图(KGS)提供人类知识的结构化表示。然而,由于不可能包含所有知识,KGs通常不完整。基于现有事实的推理铺平了一种发现缺失事实的方法。在本文中,我们研究了了解完成缺失事实三胞胎的知识图表的推理的学习逻辑规则问题。学习逻辑规则将具有很强的解释性的模型以及概括到类似任务的能力。我们提出了一种称为MPLR的模型,可以改进现有模型以完全使用培训数据,并且考虑多目标方案。此外,考虑到缺乏评估模型表现和开采规则的质量,我们进一步提出了两名新颖的指标来帮助解决问题。实验结果证明我们的MPLR模型在五个基准数据集中优于最先进的方法。结果还证明了指标的有效性。
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Different people speak with diverse personalized speaking styles. Although existing one-shot talking head methods have made significant progress in lip sync, natural facial expressions, and stable head motions, they still cannot generate diverse speaking styles in the final talking head videos. To tackle this problem, we propose a one-shot style-controllable talking face generation framework. In a nutshell, we aim to attain a speaking style from an arbitrary reference speaking video and then drive the one-shot portrait to speak with the reference speaking style and another piece of audio. Specifically, we first develop a style encoder to extract dynamic facial motion patterns of a style reference video and then encode them into a style code. Afterward, we introduce a style-controllable decoder to synthesize stylized facial animations from the speech content and style code. In order to integrate the reference speaking style into generated videos, we design a style-aware adaptive transformer, which enables the encoded style code to adjust the weights of the feed-forward layers accordingly. Thanks to the style-aware adaptation mechanism, the reference speaking style can be better embedded into synthesized videos during decoding. Extensive experiments demonstrate that our method is capable of generating talking head videos with diverse speaking styles from only one portrait image and an audio clip while achieving authentic visual effects. Project Page: https://github.com/FuxiVirtualHuman/styletalk.
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Nowadays, time-stamped web documents related to a general news query floods spread throughout the Internet, and timeline summarization targets concisely summarizing the evolution trajectory of events along the timeline. Unlike traditional document summarization, timeline summarization needs to model the time series information of the input events and summarize important events in chronological order. To tackle this challenge, in this paper, we propose a Unified Timeline Summarizer (UTS) that can generate abstractive and extractive timeline summaries in time order. Concretely, in the encoder part, we propose a graph-based event encoder that relates multiple events according to their content dependency and learns a global representation of each event. In the decoder part, to ensure the chronological order of the abstractive summary, we propose to extract the feature of event-level attention in its generation process with sequential information remained and use it to simulate the evolutionary attention of the ground truth summary. The event-level attention can also be used to assist in extracting summary, where the extracted summary also comes in time sequence. We augment the previous Chinese large-scale timeline summarization dataset and collect a new English timeline dataset. Extensive experiments conducted on these datasets and on the out-of-domain Timeline 17 dataset show that UTS achieves state-of-the-art performance in terms of both automatic and human evaluations.
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Masked image modeling (MIM) has shown great promise for self-supervised learning (SSL) yet been criticized for learning inefficiency. We believe the insufficient utilization of training signals should be responsible. To alleviate this issue, we introduce a conceptually simple yet learning-efficient MIM training scheme, termed Disjoint Masking with Joint Distillation (DMJD). For disjoint masking (DM), we sequentially sample multiple masked views per image in a mini-batch with the disjoint regulation to raise the usage of tokens for reconstruction in each image while keeping the masking rate of each view. For joint distillation (JD), we adopt a dual branch architecture to respectively predict invisible (masked) and visible (unmasked) tokens with superior learning targets. Rooting in orthogonal perspectives for training efficiency improvement, DM and JD cooperatively accelerate the training convergence yet not sacrificing the model generalization ability. Concretely, DM can train ViT with half of the effective training epochs (3.7 times less time-consuming) to report competitive performance. With JD, our DMJD clearly improves the linear probing classification accuracy over ConvMAE by 5.8%. On fine-grained downstream tasks like semantic segmentation, object detection, etc., our DMJD also presents superior generalization compared with state-of-the-art SSL methods. The code and model will be made public at https://github.com/mx-mark/DMJD.
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Improving the visual quality of the given degraded observation by correcting exposure level is a fundamental task in the computer vision community. Existing works commonly lack adaptability towards unknown scenes because of the data-driven patterns (deep networks) and limited regularization (traditional optimization), and they usually need time-consuming inference. These two points heavily limit their practicability. In this paper, we establish a Practical Exposure Corrector (PEC) that assembles the characteristics of efficiency and performance. To be concrete, we rethink the exposure correction to provide a linear solution with exposure-sensitive compensation. Around generating the compensation, we introduce an exposure adversarial function as the key engine to fully extract valuable information from the observation. By applying the defined function, we construct a segmented shrinkage iterative scheme to generate the desired compensation. Its shrinkage nature supplies powerful support for algorithmic stability and robustness. Extensive experimental evaluations fully reveal the superiority of our proposed PEC. The code is available at https://rsliu.tech/PEC.
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