在文本中提取时间关系是自然语言理解的一个至关重要但充满挑战的问题。根据事件之间的距离，模型必须学会从事件对周围的本地和全局环境中进行不同的信息以进行时间关系预测。学习如何融合这些信息已证明对基于变压器的语言模型具有挑战性。因此，我们介绍了mulco：多尺度对比的共同训练，这是一种更好地融合本地和全球情境化特征的技术。我们的模型使用基于BERT的语言模型编码本地上下文和图形神经网络（GNN）来表示全局文档级句法和时间特征。与以前的最先进方法不同，该方法在多视图功能上使用简单的串联或使用复杂的强化学习方法选择最佳句子，我们的模型Co-Trains GNN和BERT模块使用多规模的对比度学习目标。 GNN和BERT模块通过将GNN多层多跳子图（即，全局上下文嵌入）和BERT输出（即局部上下文嵌入）进行对比，从而学习了协同参数化。我们从经验上证明，与当前的最新技术相比，Mulco提供了改进的使用Bert和GNN编码的本地和全球环境的能力。我们的实验结果表明，Mulco在几个时间关系提取数据集上实现了新的最新结果。

自驱动粒子（SDP）描述了日常生活中常见的一类常见的多种子体系统，例如植绒鸟类和交通流量。在SDP系统中，每个代理商都追求自己的目标，并不断改变其与附近代理商的合作或竞争行为。手动设计用于此类SDP系统的控制器是耗时的，而产生的紧急行为往往是不可逼真的，也不是更广泛的。因此，SDP系统的现实模拟仍然具有挑战性。强化学习提供了一种吸引人的替代方案，用于自动化SDP控制器的开发。然而，以前的多档强化学习（Marl）方法将代理人定义为手头之前的队友或敌人，这未能捕获每个代理的作用的SDP的本质，即使在一个集中也变化或竞争。为了用Marl模拟SDP，一个关键挑战是协调代理的行为，同时仍然最大化个人目标。将交通仿真作为测试床，在这项工作中，我们开发了一种称为协调政策优化（Copo）的新型MARL方法，该方法包括社会心理学原理来学习SDP的神经控制器。实验表明，与各种度量标准的Marl基线相比，该方法可以实现优越的性能。明显的车辆明显地表现出复杂和多样化的社会行为，以提高整个人口的性能和安全性。演示视频和源代码可用于：https://decisionforce.github.io/copo/

在本文中，我们介绍了2022年多模式情感分析挑战（MUSE）的解决方案，其中包括Muse-Humor，Muse-Rection和Muse Surns Sub-Challenges。 2022年穆斯穆斯（Muse 2022）着重于幽默检测，情绪反应和多模式的情感压力，利用不同的方式和数据集。在我们的工作中，提取了不同种类的多模式特征，包括声学，视觉，文本和生物学特征。这些功能由Temma和Gru融合到自发机制框架中。在本文中，1）提取了一些新的音频功能，面部表达功能和段落级文本嵌入以进行准确的改进。 2）我们通过挖掘和融合多模式特征来显着提高多模式情感预测的准确性和可靠性。 3）在模型培训中应用有效的数据增强策略，以减轻样本不平衡问题并防止模型形成学习有偏见的主题字符。对于博物馆的子挑战，我们的模型获得了0.8932的AUC分数。对于Muse Rection子挑战，我们在测试集上的Pearson相关系数为0.3879，它的表现优于所有其他参与者。对于Muse Surst Sub-Challenge，我们的方法在测试数据集上的唤醒和价值都优于基线，达到了0.5151的最终综合结果。

随机梯度下降（SGD）是一种深入学习神经网络中广泛使用的算法，已吸引了对其成功背后的理论原理的持续研究。最近的一项工作发现了神经权重的方差与SGD下溶液附近损失功能的景观平坦之间的通用逆差异 - 流动性（IVF）关系[Feng＆tu，PNAS 118,0027（2021）]。为了调查这种似乎违反统计原理的行为，我们部署了随机分解来分析SGD的动力学特性。该方法构建了可以通过Boltzmann分布使用的真实“能量”函数。新能源与通常的成本函数不同，并解释了SGD下的IVF关系。我们进一步验证了冯工作中确定的缩放关系。我们的方法可能会弥合经典统计力学与新兴人工智能学科之间的差距，并有可能对后者更好地算法。

Benefiting from the intrinsic supervision information exploitation capability, contrastive learning has achieved promising performance in the field of deep graph clustering recently. However, we observe that two drawbacks of the positive and negative sample construction mechanisms limit the performance of existing algorithms from further improvement. 1) The quality of positive samples heavily depends on the carefully designed data augmentations, while inappropriate data augmentations would easily lead to the semantic drift and indiscriminative positive samples. 2) The constructed negative samples are not reliable for ignoring important clustering information. To solve these problems, we propose a Cluster-guided Contrastive deep Graph Clustering network (CCGC) by mining the intrinsic supervision information in the high-confidence clustering results. Specifically, instead of conducting complex node or edge perturbation, we construct two views of the graph by designing special Siamese encoders whose weights are not shared between the sibling sub-networks. Then, guided by the high-confidence clustering information, we carefully select and construct the positive samples from the same high-confidence cluster in two views. Moreover, to construct semantic meaningful negative sample pairs, we regard the centers of different high-confidence clusters as negative samples, thus improving the discriminative capability and reliability of the constructed sample pairs. Lastly, we design an objective function to pull close the samples from the same cluster while pushing away those from other clusters by maximizing and minimizing the cross-view cosine similarity between positive and negative samples. Extensive experimental results on six datasets demonstrate the effectiveness of CCGC compared with the existing state-of-the-art algorithms.

As one of the prevalent methods to achieve automation systems, Imitation Learning (IL) presents a promising performance in a wide range of domains. However, despite the considerable improvement in policy performance, the corresponding research on the explainability of IL models is still limited. Inspired by the recent approaches in explainable artificial intelligence methods, we proposed a model-agnostic explaining framework for IL models called R2RISE. R2RISE aims to explain the overall policy performance with respect to the frames in demonstrations. It iteratively retrains the black-box IL model from the randomized masked demonstrations and uses the conventional evaluation outcome environment returns as the coefficient to build an importance map. We also conducted experiments to investigate three major questions concerning frames' importance equality, the effectiveness of the importance map, and connections between importance maps from different IL models. The result shows that R2RISE successfully distinguishes important frames from the demonstrations.

Text clustering and topic extraction are two important tasks in text mining. Usually, these two tasks are performed separately. For topic extraction to facilitate clustering, we can first project texts into a topic space and then perform a clustering algorithm to obtain clusters. To promote topic extraction by clustering, we can first obtain clusters with a clustering algorithm and then extract cluster-specific topics. However, this naive strategy ignores the fact that text clustering and topic extraction are strongly correlated and follow a chicken-and-egg relationship. Performing them separately fails to make them mutually benefit each other to achieve the best overall performance. In this paper, we propose an unsupervised text clustering and topic extraction framework (ClusTop) which integrates text clustering and topic extraction into a unified framework and can achieve high-quality clustering result and extract topics from each cluster simultaneously. Our framework includes four components: enhanced language model training, dimensionality reduction, clustering and topic extraction, where the enhanced language model can be viewed as a bridge between clustering and topic extraction. On one hand, it provides text embeddings with a strong cluster structure which facilitates effective text clustering; on the other hand, it pays high attention on the topic related words for topic extraction because of its self-attention architecture. Moreover, the training of enhanced language model is unsupervised. Experiments on two datasets demonstrate the effectiveness of our framework and provide benchmarks for different model combinations in this framework.

An increasing number of public datasets have shown a marked clinical impact on assessing anatomical structures. However, each of the datasets is small, partially labeled, and rarely investigates severe tumor subjects. Moreover, current models are limited to segmenting specific organs/tumors, which can not be extended to novel domains and classes. To tackle these limitations, we introduce embedding learned from Contrastive Language-Image Pre-training (CLIP) to segmentation models, dubbed the CLIP-Driven Universal Model. The Universal Model can better segment 25 organs and 6 types of tumors by exploiting the semantic relationship between abdominal structures. The model is developed from an assembly of 14 datasets with 3,410 CT scans and evaluated on 6,162 external CT scans from 3 datasets. We rank first on the public leaderboard of the Medical Segmentation Decathlon (MSD) and achieve the state-of-the-art results on Beyond The Cranial Vault (BTCV). Compared with dataset-specific models, the Universal Model is computationally more efficient (6x faster), generalizes better to CT scans from varying sites, and shows stronger transfer learning performance on novel tasks. The design of CLIP embedding enables the Universal Model to be easily extended to new classes without catastrophically forgetting the previously learned classes.

Recent advances in self-supervised learning (SSL) in computer vision are primarily comparative, whose goal is to preserve invariant and discriminative semantics in latent representations by comparing siamese image views. However, the preserved high-level semantics do not contain enough local information, which is vital in medical image analysis (e.g., image-based diagnosis and tumor segmentation). To mitigate the locality problem of comparative SSL, we propose to incorporate the task of pixel restoration for explicitly encoding more pixel-level information into high-level semantics. We also address the preservation of scale information, a powerful tool in aiding image understanding but has not drawn much attention in SSL. The resulting framework can be formulated as a multi-task optimization problem on the feature pyramid. Specifically, we conduct multi-scale pixel restoration and siamese feature comparison in the pyramid. In addition, we propose non-skip U-Net to build the feature pyramid and develop sub-crop to replace multi-crop in 3D medical imaging. The proposed unified SSL framework (PCRLv2) surpasses its self-supervised counterparts on various tasks, including brain tumor segmentation (BraTS 2018), chest pathology identification (ChestX-ray, CheXpert), pulmonary nodule detection (LUNA), and abdominal organ segmentation (LiTS), sometimes outperforming them by large margins with limited annotations.

Due to their ability to offer more comprehensive information than data from a single view, multi-view (multi-source, multi-modal, multi-perspective, etc.) data are being used more frequently in remote sensing tasks. However, as the number of views grows, the issue of data quality becomes more apparent, limiting the potential benefits of multi-view data. Although recent deep neural network (DNN) based models can learn the weight of data adaptively, a lack of research on explicitly quantifying the data quality of each view when fusing them renders these models inexplicable, performing unsatisfactorily and inflexible in downstream remote sensing tasks. To fill this gap, in this paper, evidential deep learning is introduced to the task of aerial-ground dual-view remote sensing scene classification to model the credibility of each view. Specifically, the theory of evidence is used to calculate an uncertainty value which describes the decision-making risk of each view. Based on this uncertainty, a novel decision-level fusion strategy is proposed to ensure that the view with lower risk obtains more weight, making the classification more credible. On two well-known, publicly available datasets of aerial-ground dual-view remote sensing images, the proposed approach achieves state-of-the-art results, demonstrating its effectiveness. The code and datasets of this article are available at the following address: https://github.com/gaopiaoliang/Evidential.