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RCAnalyzer: visual analytics of rare categories in dynamic networks

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Abstract

A dynamic network refers to a graph structure whose nodes and/or links dynamically change over time. Existing visualization and analysis techniques focus mainly on summarizing and revealing the primary evolution patterns of the network structure. Little work focuses on detecting anomalous changing patterns in the dynamic network, the rare occurrence of which could damage the development of the entire structure. In this study, we introduce the first visual analysis system RCAnalyzer designed for detecting rare changes of sub-structures in a dynamic network. The proposed system employs a rare category detection algorithm to identify anomalous changing structures and visualize them in the context to help oracles examine the analysis results and label the data. In particular, a novel visualization is introduced, which represents the snapshots of a dynamic network in a series of connected triangular matrices. Hierarchical clustering and optimal tree cut are performed on each matrix to illustrate the detected rare change of nodes and links in the context of their surrounding structures. We evaluate our technique via a case study and a user study. The evaluation results verify the effectiveness of our system.

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Authors and Affiliations

Authors

Contributions

Dong-ming HAN processed the data and designed the experiment. Fang-zhou GUO designed the research and drafted the manuscript. Da-wei ZHOU provided the RCD algorithm. Nan CAO and Wei CHEN helped organize the manuscript. Jing-rui HE and Ming-liang XU polished the paper. Jia-cheng PAN implemented the interface and finalized the paper.

Corresponding author

Correspondence to Wei Chen.

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Compliance with ethics guidelines

Jia-cheng PAN, Dong-ming HAN, Fang-zhou GUO, Dawei ZHOU, Nan CAO, Jing-rui HE, Ming-liang XU, and Wei CHEN declare that they have no conflict of interest.

The Ethics Committee of Zhejiang University had reviewed the experimental procedure and method, and approved this experiment. Before the experiment, all subjects signed the informed written consent and agreed to participate in this experiment.

Project supported by the National Natural Science Foundation of China (Nos. U1866602, 61772456, U1736109, and 61972122)

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Pan, Jc., Han, Dm., Guo, Fz. et al. RCAnalyzer: visual analytics of rare categories in dynamic networks. Front Inform Technol Electron Eng 21, 491–506 (2020). https://doi.org/10.1631/FITEE.1900310

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  • DOI: https://doi.org/10.1631/FITEE.1900310

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