DhCM: dynamic and hierarchical event categorization and discovery for social media stream

Jinjin Guo, Zhiguo Gong, Longbing Cao

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The online event discovery in social media based documents is useful, such as for disaster recognition and intervention. However, the diverse events incrementally identified from social media streams remain accumulated, ad hoc, and unstructured. They cannot assist users in digesting the tremendous amount of information and finding their interested events. Further, most of the existing work is challenged by jointly identifying incremental events and dynamically organizing them in an adaptive hierarchy. To address these problems, this article proposes dynamic and hierarchical Categorization Modeling (dhCM) for social media stream. Instead of manually dividing the timeframe, a multimodal event miner exploits a density estimation technique to continuously capture the temporal influence between documents and incrementally identify online events in textual, temporal, and spatial spaces. At the same time, an adaptive categorization hierarchy is formed to automatically organize the documents into proper categories at multiple levels of granularities. In a nonparametric manner, dhCM accommodates the increasing complexity of data streams with automatically growing the categorization hierarchy over adaptive growth. A sequential Monte Carlo algorithm is used for the online inference of the dhCM parameters. Extensive experiments show that dhCM outperforms the state-of-the-art models in terms of term coherence, category abstraction and specialization, hierarchical affinity, and event categorization and discovery accuracy.

Original languageEnglish
Article number57
Pages (from-to)1-25
Number of pages25
JournalACM Transactions on Intelligent Systems and Technology
Issue number5
Publication statusPublished - Oct 2021
Externally publishedYes


  • Hierarchical categorization
  • document stream
  • online inference
  • Bayesian nonparametrics
  • kernel estimation
  • event categorization
  • event discovery


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