Users' involvement in creating and propagating news is a vital aspect of fake news detection in online social networks. Intuitively, credible users are more likely to share trustworthy news, while untrusted users have a higher probability of spreading untrustworthy news. In this paper, we construct a dual-layer graph (i.e., the news layer and the user layer) to extract multiple relations of news and users in social networks to derive rich information for detecting fake news. Based on the dual-layer graph, we propose a fake news detection model named Us-DeFake. It learns the propagation features of news in the news layer and the interaction features of users in the user layer. Through the inter-layer in the graph, Us-DeFake fuses the user signals that contain credibility information into the news features, to provide distinctive user-aware embeddings of news for fake news detection. The training process conducts on multiple dual-layer subgraphs obtained by a graph sampler to scale Us-DeFake in large scale social networks. Extensive experiments on real-world datasets illustrate the superiority of Us-DeFake which outperforms all baselines, and the users' credibility signals learned by interaction relation can notably improve the performance of our model.
translated by 谷歌翻译
Nowadays, fake news easily propagates through online social networks and becomes a grand threat to individuals and society. Assessing the authenticity of news is challenging due to its elaborately fabricated contents, making it difficult to obtain large-scale annotations for fake news data. Due to such data scarcity issues, detecting fake news tends to fail and overfit in the supervised setting. Recently, graph neural networks (GNNs) have been adopted to leverage the richer relational information among both labeled and unlabeled instances. Despite their promising results, they are inherently focused on pairwise relations between news, which can limit the expressive power for capturing fake news that spreads in a group-level. For example, detecting fake news can be more effective when we better understand relations between news pieces shared among susceptible users. To address those issues, we propose to leverage a hypergraph to represent group-wise interaction among news, while focusing on important news relations with its dual-level attention mechanism. Experiments based on two benchmark datasets show that our approach yields remarkable performance and maintains the high performance even with a small subset of labeled news data.
translated by 谷歌翻译
假新闻,虚假或误导性信息作为新闻,对社会的许多方面产生了重大影响,例如在政治或医疗域名。由于假新闻的欺骗性,仅将自然语言处理(NLP)技术应用于新闻内容不足。多级社会上下文信息(新闻出版商和社交媒体的参与者)和用户参与的时间信息是假新闻检测中的重要信息。然而,正确使用此信息,介绍了三个慢性困难:1)多级社会上下文信息很难在没有信息丢失的情况下使用,2)难以使用时间信息以及多级社会上下文信息,3 )具有多级社会背景和时间信息的新闻表示难以以端到端的方式学习。为了克服所有三个困难,我们提出了一种新颖的假新闻检测框架,杂扫描。我们使用元路径在不损失的情况下提取有意义的多级社会上下文信息。 COMA-PATO,建议连接两个节点类型的复合关系,以捕获异构图中的语义。然后,我们提出了元路径实例编码和聚合方法,以捕获用户参与的时间信息,并生成新闻代表端到端。根据我们的实验,杂扫不断的性能改善了最先进的假新闻检测方法。
translated by 谷歌翻译
谣言在社交媒体的时代猖獗。谈话结构提供有价值的线索,以区分真实和假声明。然而,现有的谣言检测方法限制为用户响应的严格关系或过度简化对话结构。在这项研究中,为了减轻不相关的帖子施加的负面影响,基本上加强了用户意见的相互作用,首先将谈话线作为无向相互作用图。然后,我们提出了一种用于谣言分类的主导分层图注意网络,其提高了考虑整个社会环境的响应帖子的表示学习,并参加可以在语义上推断目标索赔的帖子。三个Twitter数据集的广泛实验表明,我们的谣言检测方法比最先进的方法实现了更好的性能,并且展示了在早期阶段检测谣言的优异容量。
translated by 谷歌翻译
假新闻是制作作为真实的信息,有意欺骗读者。最近,依靠社交媒体的人民币为新闻消费的人数显着增加。由于这种快速增加,错误信息的不利影响会影响更广泛的受众。由于人们对这种欺骗性的假新闻的脆弱性增加,在早期阶段检测错误信息的可靠技术是必要的。因此,作者提出了一种基于图形的基于图形的框架社会图,其具有多头关注和发布者信息和新闻统计网络(SOMPS-Net),包括两个组件 - 社交交互图(SIG)和发布者和新闻统计信息(PNS)。假设模型在HealthStory DataSet上进行了实验,并在包括癌症,阿尔茨海默,妇产科和营养等各种医疗主题上推广。 Somps-Net明显优于其他基于现实的图表的模型,在HealthStory上实验17.1%。此外,早期检测的实验表明,Somps-Net预测的假新闻文章在其广播仅需8小时内为79%确定。因此,这项工作的贡献奠定了在早期阶段捕获多种医疗主题的假健康新闻的基础。
translated by 谷歌翻译
异质图卷积网络在解决异质网络数据的各种网络分析任务方面已广受欢迎,从链接预测到节点分类。但是,大多数现有作品都忽略了多型节点之间的多重网络的关系异质性,而在元路径中,元素嵌入中关系的重要性不同,这几乎无法捕获不同关系跨不同关系的异质结构信号。为了应对这一挑战,这项工作提出了用于异质网络嵌入的多重异质图卷积网络(MHGCN)。我们的MHGCN可以通过多层卷积聚合自动学习多重异质网络中不同长度的有用的异质元路径相互作用。此外,我们有效地将多相关结构信号和属性语义集成到学习的节点嵌入中,并具有无监督和精选的学习范式。在具有各种网络分析任务的五个现实世界数据集上进行的广泛实验表明,根据所有评估指标,MHGCN与最先进的嵌入基线的优势。
translated by 谷歌翻译
检测假新闻对于确保信息的真实性和维持新闻生态系统的可靠性至关重要。最近,由于最近的社交媒体和伪造的内容生成技术(例如Deep Fake)的扩散,假新闻内容的增加了。假新闻检测的大多数现有方式都集中在基于内容的方法上。但是,这些技术中的大多数无法处理生成模型生产的超现实合成媒体。我们最近的研究发现,真实和虚假新闻的传播特征是可以区分的,无论其方式如何。在这方面,我们已经根据社会环境调查了辅助信息,以检测假新闻。本文通过基于混合图神经网络的方法分析了假新闻检测的社会背景。该混合模型基于将图形神经网络集成到新闻内容上的新闻和BI定向编码器表示的传播中,以了解文本功能。因此,这种提出的方​​法可以学习内容以及上下文特征,因此能够在Politifact上以F1分别为0.91和0.93的基线模型和八西八角数据集的基线模型,分别超过了基线模型,分别在八西八学数据集中胜过0.93
translated by 谷歌翻译
Fake news detection has become a research area that goes way beyond a purely academic interest as it has direct implications on our society as a whole. Recent advances have primarily focused on textbased approaches. However, it has become clear that to be effective one needs to incorporate additional, contextual information such as spreading behaviour of news articles and user interaction patterns on social media. We propose to construct heterogeneous social context graphs around news articles and reformulate the problem as a graph classification task. Exploring the incorporation of different types of information (to get an idea as to what level of social context is most effective) and using different graph neural network architectures indicates that this approach is highly effective with robust results on a common benchmark dataset.
translated by 谷歌翻译
社交机器人被称为社交网络上的自动帐户,这些帐户试图像人类一样行事。尽管图形神经网络(GNNS)已大量应用于社会机器人检测领域,但大量的领域专业知识和先验知识大量参与了最先进的方法,以设计专门的神经网络体系结构,以设计特定的神经网络体系结构。分类任务。但是,在模型设计中涉及超大的节点和网络层,通常会导致过度平滑的问题和缺乏嵌入歧视。在本文中,我们提出了罗斯加斯(Rosgas),这是一种新颖的加强和自我监督的GNN Architecture搜索框架,以适应性地指出了最合适的多跳跃社区和GNN体系结构中的层数。更具体地说,我们将社交机器人检测问题视为以用户为中心的子图嵌入和分类任务。我们利用异构信息网络来通过利用帐户元数据,关系,行为特征和内容功能来展示用户连接。 Rosgas使用多代理的深钢筋学习(RL)机制来导航最佳邻域和网络层的搜索,以分别学习每个目标用户的子图嵌入。开发了一种用于加速RL训练过程的最接近的邻居机制,Rosgas可以借助自我监督的学习来学习更多的判别子图。 5个Twitter数据集的实验表明,Rosgas在准确性,训练效率和稳定性方面优于最先进的方法,并且在处理看不见的样本时具有更好的概括。
translated by 谷歌翻译
Anomaly analytics is a popular and vital task in various research contexts, which has been studied for several decades. At the same time, deep learning has shown its capacity in solving many graph-based tasks like, node classification, link prediction, and graph classification. Recently, many studies are extending graph learning models for solving anomaly analytics problems, resulting in beneficial advances in graph-based anomaly analytics techniques. In this survey, we provide a comprehensive overview of graph learning methods for anomaly analytics tasks. We classify them into four categories based on their model architectures, namely graph convolutional network (GCN), graph attention network (GAT), graph autoencoder (GAE), and other graph learning models. The differences between these methods are also compared in a systematic manner. Furthermore, we outline several graph-based anomaly analytics applications across various domains in the real world. Finally, we discuss five potential future research directions in this rapidly growing field.
translated by 谷歌翻译
图形神经网络(GNN)在学习强大的节点表示中显示了令人信服的性能,这些表现在保留节点属性和图形结构信息的强大节点表示中。然而,许多GNNS在设计有更深的网络结构或手柄大小的图形时遇到有效性和效率的问题。已经提出了几种采样算法来改善和加速GNN的培训,但他们忽略了解GNN性能增益的来源。图表数据中的信息的测量可以帮助采样算法来保持高价值信息,同时消除冗余信息甚至噪声。在本文中,我们提出了一种用于GNN的公制引导(MEGUIDE)子图学习框架。 MEGUIDE采用两种新颖的度量:功能平滑和连接失效距离,以指导子图采样和迷你批次的培训。功能平滑度专为分析节点的特征而才能保留最有价值的信息,而连接失败距离可以测量结构信息以控制子图的大小。我们展示了MEGUIDE在多个数据集上培训各种GNN的有效性和效率。
translated by 谷歌翻译
Recently, online social media has become a primary source for new information and misinformation or rumours. In the absence of an automatic rumour detection system the propagation of rumours has increased manifold leading to serious societal damages. In this work, we propose a novel method for building automatic rumour detection system by focusing on oversampling to alleviating the fundamental challenges of class imbalance in rumour detection task. Our oversampling method relies on contextualised data augmentation to generate synthetic samples for underrepresented classes in the dataset. The key idea exploits selection of tweets in a thread for augmentation which can be achieved by introducing a non-random selection criteria to focus the augmentation process on relevant tweets. Furthermore, we propose two graph neural networks(GNN) to model non-linear conversations on a thread. To enhance the tweet representations in our method we employed a custom feature selection technique based on state-of-the-art BERTweet model. Experiments of three publicly available datasets confirm that 1) our GNN models outperform the the current state-of-the-art classifiers by more than 20%(F1-score); 2) our oversampling technique increases the model performance by more than 9%;(F1-score) 3) focusing on relevant tweets for data augmentation via non-random selection criteria can further improve the results; and 4) our method has superior capabilities to detect rumours at very early stage.
translated by 谷歌翻译
假新闻的检测往往需要复杂的推理技能,例如通过考虑单词级微妙的线索来逻辑地结合信息。在本文中,我们通过更好地反映人类思维的逻辑流程并实现微妙的线索建模,迈向假新闻检测的微粒推理。特别是,我们通过遵循人类信息处理模型提出了一种细粒度的推理框架,引入了一种基于互连的方法,以结合人类了解哪些证据更重要,并设计了一个先知的双通道内核图网络模拟证据之间的微妙差异。广泛的实验表明,我们的模型优于最先进的方法,并展示了我们的方法的解释性。
translated by 谷歌翻译
Graph Convolutional Networks (GCNs) are powerful models for learning representations of attributed graphs. To scale GCNs to large graphs, state-of-the-art methods use various layer sampling techniques to alleviate the "neighbor explosion" problem during minibatch training. We propose GraphSAINT, a graph sampling based inductive learning method that improves training efficiency and accuracy in a fundamentally different way. By changing perspective, GraphSAINT constructs minibatches by sampling the training graph, rather than the nodes or edges across GCN layers. Each iteration, a complete GCN is built from the properly sampled subgraph. Thus, we ensure fixed number of well-connected nodes in all layers. We further propose normalization technique to eliminate bias, and sampling algorithms for variance reduction. Importantly, we can decouple the sampling from the forward and backward propagation, and extend GraphSAINT with many architecture variants (e.g., graph attention, jumping connection). GraphSAINT demonstrates superior performance in both accuracy and training time on five large graphs, and achieves new state-of-the-art F1 scores for PPI (0.995) and Reddit (0.970).
translated by 谷歌翻译
图形神经网络(GNN)在解决图形结构数据(即网络)方面的各种分析任务方面已广受欢迎。典型的gnns及其变体遵循一种消息的方式,该方式通过网络拓扑沿网络拓扑的特征传播过程获得网络表示,然而,它们忽略了许多现实世界网络中存在的丰富文本语义(例如,局部单词序列)。现有的文本丰富网络方法通过主要利用内部信息(例如主题或短语/单词)来整合文本语义,这些信息通常无法全面地挖掘文本语义,从而限制了网络结构和文本语义之间的相互指导。为了解决这些问题,我们提出了一个具有外部知识(TEKO)的新型文本富裕的图形神经网络,以充分利用文本丰富的网络中的结构和文本信息。具体而言,我们首先提出一个灵活的异质语义网络,该网络结合了文档和实体之间的高质量实体和互动。然后,我们介绍两种类型的外部知识,即结构化的三胞胎和非结构化实体描述,以更深入地了解文本语义。我们进一步为构建的异质语义网络设计了互惠卷积机制,使网络结构和文本语义能够相互协作并学习高级网络表示。在四个公共文本丰富的网络以及一个大规模的电子商务搜索数据集上进行了广泛的实验结果,这说明了Teko优于最先进的基线。
translated by 谷歌翻译
本次调查绘制了用于分析社交媒体数据的生成方法的研究状态的广泛的全景照片(Sota)。它填补了空白,因为现有的调查文章在其范围内或被约会。我们包括两个重要方面,目前正在挖掘和建模社交媒体的重要性:动态和网络。社会动态对于了解影响影响或疾病的传播,友谊的形成,友谊的形成等,另一方面,可以捕获各种复杂关系,提供额外的洞察力和识别否则将不会被注意的重要模式。
translated by 谷歌翻译
Graph Neural Networks (GNNs) have attracted increasing attention in recent years and have achieved excellent performance in semi-supervised node classification tasks. The success of most GNNs relies on one fundamental assumption, i.e., the original graph structure data is available. However, recent studies have shown that GNNs are vulnerable to the complex underlying structure of the graph, making it necessary to learn comprehensive and robust graph structures for downstream tasks, rather than relying only on the raw graph structure. In light of this, we seek to learn optimal graph structures for downstream tasks and propose a novel framework for semi-supervised classification. Specifically, based on the structural context information of graph and node representations, we encode the complex interactions in semantics and generate semantic graphs to preserve the global structure. Moreover, we develop a novel multi-measure attention layer to optimize the similarity rather than prescribing it a priori, so that the similarity can be adaptively evaluated by integrating measures. These graphs are fused and optimized together with GNN towards semi-supervised classification objective. Extensive experiments and ablation studies on six real-world datasets clearly demonstrate the effectiveness of our proposed model and the contribution of each component.
translated by 谷歌翻译
保持个人特征和复杂的关系,广泛利用和研究了图表数据。通过更新和聚合节点的表示,能够捕获结构信息,图形神经网络(GNN)模型正在获得普及。在财务背景下,该图是基于实际数据构建的,这导致复杂的图形结构,因此需要复杂的方法。在这项工作中,我们在最近的财务环境中对GNN模型进行了全面的审查。我们首先将普通使用的财务图分类并总结每个节点的功能处理步骤。然后,我们总结了每个地图类型的GNN方法,每个区域的应用,并提出一些潜在的研究领域。
translated by 谷歌翻译
知识图表通常掺入到推荐系统,以提高整体性能。由于知识图的推广和规模,大多数知识的关系是不是目标用户项预测有帮助。要利用知识图在推荐系统捕捉目标具体知识的关系,我们需要提炼知识图,以保留有用的信息和完善的知识来捕捉用户的喜好。为了解决这个问题,我们提出了知识感知条件注意网络(KCAN),这是一个终端到终端的模式纳入知识图形转换为推荐系统。具体来说,我们使用一个知识感知注意传播方式,以获得所述节点表示第一,其捕获用户 - 项目网络和知识图表对全球语义相似度。然后给出一个目标,即用户 - 项对,我们会自动提炼出知识图到基于知识感知关注的具体目标子。随后,通过在应用子有条件的注意力聚集,我们细化知识图,以获得特定目标节点表示。因此,我们可以得到两个表示性和个性化,以实现整体性能。现实世界的数据集实验结果表明,我们对国家的最先进的算法框架的有效性。
translated by 谷歌翻译
Twitter机器人检测已成为打击错误信息,促进社交媒体节制并保持在线话语的完整性的越来越重要的任务。最先进的机器人检测方法通常利用Twitter网络的图形结构,在面对传统方法无法检测到的新型Twitter机器人时,它们表现出令人鼓舞的性能。但是,现有的Twitter机器人检测数据集很少是基于图形的,即使这些基于图形的数据集也遭受有限的数据集量表,不完整的图形结构以及低注释质量。实际上,缺乏解决这些问题的大规模基于图的Twitter机器人检测基准,严重阻碍了基于图形的机器人检测方法的开发和评估。在本文中,我们提出了Twibot-22,这是一个综合基于图的Twitter机器人检测基准,它显示了迄今为止最大的数据集,在Twitter网络上提供了多元化的实体和关系,并且与现有数据集相比具有更好的注释质量。此外,我们重新实施35代表性的Twitter机器人检测基线,并在包括Twibot-22在内的9个数据集上进行评估,以促进对模型性能和对研究进度的整体了解的公平比较。为了促进进一步的研究,我们将所有实施的代码和数据集巩固到Twibot-22评估框架中,研究人员可以在其中始终如一地评估新的模型和数据集。 Twibot-22 Twitter机器人检测基准和评估框架可在https://twibot22.github.io/上公开获得。
translated by 谷歌翻译