arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2607.05855cs.LGcs.AI
收藏

通过行为和语言模式对信息操作用户进行无监督异常检测

Unsupervised Anomaly Detection of Information Operations Users via Behavioral and Language Patterns

RMIT University(皇家墨尔本理工大学);Macquarie University(麦考瑞大学)

Sishun Liu, Sajal Halder, Ke Deng, Yan Wang, Xiuzhen Zhang

AI总结:

研究针对社交媒体网络信息操作检测难题,提出无监督方法TENSOR,利用多模态数据,通过训练时间点过程捕捉异常行为模式,并引入新证据函数调整输出,在五个真实数据集上表现优于基线。

摘要:

社交媒体网络上的信息操作已被视为对民主和现代社会的重大威胁,人工检测具有挑战性且成本高昂。现有监督式IO检测方法无法捕捉IO用户行为演变的动态特性,现有无监督方法依赖的IO用户间协调假设在实际中可能不存在。为克服这些局限,我们将IO用户检测设为异常检测问题,提出名为TENSOR的无监督IO用户检测方法,利用多模态数据,包括在线用户时间行为和消息文本内容。具体而言,训练时间点过程捕捉IO用户异常时间行为模式,引入新证据函数将LLM响应转化为定量分数调整TPP输出。实验结果表明TENSOR在五个真实世界IO数据集上优于基线。

英文摘要:

Information Operations on social media networks have been identified as a significant threat to democracy and modern society, but they are challenging and expensive to detect by humans. Existing supervised IO detection methods fail to capture the dynamic nature of evolving IO user behavior, while existing unsupervised approaches rely on oversimplified assumptions of coordination among IO users that may not exist in practice. To overcome the limitations of existing methods, we formulate IO user detection as an anomaly detection problem and propose a novel unsupervised IO user detection approach called Temporal-bEhavior-laNguage Signals for information Operation Recognition (TENSOR), which leverages multimodal data, including temporal online user behavior, such as message posting activities, and the textual content of the messages. The motivation is that IO users are typically a very small fraction of all online users and have unique temporal behavioral and language patterns. Specifically, we train a Temporal Point Process (TPP) to capture abnormal temporal behavioral patterns of IO users because they are known to behave in a coordinated manner for IO campaigns. We further introduce a novel evidence function that converts LLM responses, which are generated from user post timelines, into quantitative scores to adjust the TPP outputs for better IO user detection. Experimental results show that TENSOR outperforms the baselines on five real-world IO datasets. Code is available at https://github.com/xiuzhenzhang/TENSOR.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑