A subgraph matching algorithm based on subgraph index for knowledge graph

Yunhao SUN, Guanyu LI, Jingjing DU, Bo NING, Heng CHEN

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PDF(12660 KB)
Front. Comput. Sci. ›› 2022, Vol. 16 ›› Issue (3) : 163606. DOI: 10.1007/s11704-020-0360-y
RESEARCH ARTICLE

A subgraph matching algorithm based on subgraph index for knowledge graph

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Abstract

The problem of subgraph matching is one fundamental issue in graph search, which is NP-Complete problem. Recently, subgraph matching has become a popular research topic in the field of knowledge graph analysis, which has a wide range of applications including question answering and semantic search. In this paper, we study the problem of subgraph matching on knowledge graph. Specifically, given a query graph q and a data graph G, the problem of subgraph matching is to conduct all possible subgraph isomorphic mappings of q on G. Knowledge graph is formed as a directed labeled multi-graph having multiple edges between a pair of vertices and it has more dense semantic and structural features than general graph. To accelerate subgraph matching on knowledge graph, we propose a novel subgraph matching algorithm based on subgraph index for knowledge graph, called as F G q T-Match. The subgraph matching algorithm consists of two key designs. One design is a subgraph index of matching-driven flow graph ( F G q T), which reduces redundant calculations in advance. Another design is a multi-label weight matrix, which evaluates a near-optimal matching tree for minimizing the intermediate candidates. With the aid of these two key designs, all subgraph isomorphic mappings are quickly conducted only by traversing F G q T. Extensive empirical studies on real and synthetic graphs demonstrate that our techniques outperform the state-of-the-art algorithms.

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Keywords

knowledge graph / subgraph matching / subgraph index / matching tree

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Yunhao SUN, Guanyu LI, Jingjing DU, Bo NING, Heng CHEN. A subgraph matching algorithm based on subgraph index for knowledge graph. Front. Comput. Sci., 2022, 16(3): 163606 https://doi.org/10.1007/s11704-020-0360-y

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 61976032, 62002039).

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