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arXiv 2302.08205cs.LGcs.AIcs.DB
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一种基于异常检测的金融事件类型增量发现方法

A method for incremental discovery of financial event types based on anomaly detection

Jilin University(吉林大学)

Dianyue Gu, Zixu Li, Zhenhai Guan, Rui Zhang, Lan Huang

摘要:

金融领域的事件数据集往往是基于实际应用场景构建的,其事件类型受场景约束,可重用性较弱;同时,海量多样的新型金融大数据也不能局限于针对特定场景定义的事件类型。这种有限的事件类型并不能满足我们对更复杂任务的研究需求,例如对重大金融事件的预测和对金融事件的连锁反应的分析。在本文中,提出了一个三阶段的方法来实现事件类型的增量发现。对于现有的带注释的金融事件数据集,三阶段方法包括:对于具有原始和未知事件类型的混合的金融事件数据集,首先应用具有异常检测的半监督深度聚类模型将数据分类为正常和异常事件,其中异常事件是不属于已知类型的事件;则用适当的事件类型标记正常事件,并且合理地聚类异常事件。最后,使用聚类关键字提取方法为新的事件聚类推荐事件的类型名称,从而增量地发现新的事件类型。所提出的方法是有效的增量发现新的事件类型的真实数据集。

英文摘要:

Event datasets in the financial domain are often constructed based on actual application scenarios, and their event types are weakly reusable due to scenario constraints; at the same time, the massive and diverse new financial big data cannot be limited to the event types defined for specific scenarios. This limitation of a small number of event types does not meet our research needs for more complex tasks such as the prediction of major financial events and the analysis of the ripple effects of financial events. In this paper, a three-stage approach is proposed to accomplish incremental discovery of event types. For an existing annotated financial event dataset, the three-stage approach consists of: for a set of financial event data with a mixture of original and unknown event types, a semi-supervised deep clustering model with anomaly detection is first applied to classify the data into normal and abnormal events, where abnormal events are events that do not belong to known types; then normal events are tagged with appropriate event types and abnormal events are reasonably clustered. Finally, a cluster keyword extraction method is used to recommend the type names of events for the new event clusters, thus incrementally discovering new event types. The proposed method is effective in the incremental discovery of new event types on real data sets.

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。

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