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Super-Graph Classification Based on Composite Subgraph Features and Extreme Learning Machine

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Abstract

A multi-graph is modeled as a bag of graphs, whose mutual relationships can be used to enhance the accuracy of multi-graph classification. However, to the best of our knowledge, research on utilizing those mutual relationships has not been reported. In this paper, we propose a novel super-graph model \(SG=(MG,AG)\), where MG denotes a multi-graph and AG represents a graph (named abstract-graph), that describes the mutual relationships among the graphs contained in MG. The super-graph classification problem is challenging to solve because of the very complex structure of the super-graph model. Furthermore, it is hard to directly select distinguished subgraphs, i.e., subgraph features, from super-graphs. A subgraph g of graph G is a graph that is isomorphic with one of the substructures of G. Moreover, the practical applications require the super-graph classification algorithm to have high precision. In this paper, we propose a concept and algorithm for selecting composite subgraph features, based on which a framework is proposed to solve the super-graph classification problem. Subgraph features denote subgraphs that can be used to distinguish super-graphs with different class labels. We first design a two-step approach to select k composite subgraph features from the subgraphs of super-graphs’ abstract-graphs and multi-graphs. Then, based on composite features and the subgraph feature representation of a super-graph, each super-graph SG is transformed into a 0-1 vector with k dimensions. If there exists a substructure in SG that is isomorphic with its i th composite feature, the i th component of the target vector is set to 1 (1 ≤ i ≤ k). Otherwise, it is set to 0. Based on the derived k-dimensional vectors, one of the existing classification algorithms is used to construct a prediction model to predict the class labels of the unseen super-graphs, such as naive Bayes or support vector machine (SVM). Specifically, we adapt the extreme learning machine (ELM) algorithm to further improve the accuracy of super-graph classification. In this paper, we propose a super-graph model and study the problem of super-graph classification. We first derive the concept of composite subgraph features that are selected by our proposed two-step method. Based on the mined composite subgraph features, we propose a super-graph classification framework (SGC) to solve the super-graph classification problem. Moreover, ELM can be used to further improve the classification accuracy. Extensive experiments on real-world image datasets show that our algorithm based on ELM is more accurate than the baseline algorithms.

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Notes

  1. http://www.vlfeat.org/

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Funding

The work is partially supported by the National Natural Science Foundation of China (No. 61702381, No. 61772124, No. 61872070), the Hubei Natural Science Foundation (No. 2017CFB196), the Scientific Research Foundation of Wuhan University of Science and Technology (2017xz015), and the Fundamental Research Funds for the Central Universities (150402002, 171605001). Jia Xu is supported the Key Projects of Higher Education Undergraduate Teaching Reform Project in Guangxi (No. 2017JGZ103) and the Scientific Research Foundation of GuangXi University (No. XGZ141182).

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Authors and Affiliations

  1. College of Computer Science and Technology, Wuhan University of Science and Technology, Wuhan, Hubei, 430065, China

    Jun Pang

  2. Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System, Wuhan, China

    Jun Pang

  3. Key Laboratory of Rich-media Knowledge Organization and Service of Digital Publishing Content, SAPPRFT, Beijing, 100038, China

    Jun Pang

  4. School of Computer Science and Engineering, Northeastern University, Shenyang, Liaoning, 110169, China

    Yuhai Zhao, Yu Gu & Ge Yu

  5. School of Computer, Electronics and Information, Guangxi University, Nanning, Guangxi, 530004, China

    Jia Xu

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  1. Jun Pang
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Correspondence to Jun Pang.

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Pang, J., Zhao, Y., Xu, J. et al. Super-Graph Classification Based on Composite Subgraph Features and Extreme Learning Machine. Cogn Comput 10, 922–936 (2018). https://doi.org/10.1007/s12559-018-9601-x

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