## Abstract

There has been a surge of interest in machine learning in graphs, as graphs and networks are ubiquitous across the globe and within science and engineering: road networks, power grids, protein-protein interaction networks, scientific collaboration networks, social networks, to name a few. Recent machine learning research has focused on efficient and effective ways to represent graph structure. Existing graph representation methods such as network embedding techniques learn to map a node (or a graph) to a vector in a low-dimensional vector space. However, the mapped values are often difficult to interpret, lacking information on the structure of the network or its subgraphs. Instead of using a low-dimensional vector to represent a graph, we propose to represent a network with a 3-dimensional shape: the network shape. We introduce the first network shape, a Kronecker hull, which represents a network as a 3D convex polyhedron using stochastic Kronecker graphs. We present a linear time algorithm to build Kronecker hulls. Network shapes provide a compact representation of networks that is easy to visualize and interpret. They captures various properties of not only the network, but also its subgraphs. For instance, they can provide the distribution of subgraphs within a network, e.g., what proportion of subgraphs are structurally similar to the whole network? Using experiments on real-world networks, we show how network shapes can be used in various applications, from computing similarity between two graphs (using the overlap between network shapes of two networks) to graph compression, where a graph with millions of nodes can be represented with a convex hull with less than 40 boundary points.

Original language | English (US) |
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Title of host publication | 2018 IEEE International Conference on Data Mining, ICDM 2018 |

Publisher | Institute of Electrical and Electronics Engineers Inc. |

Pages | 177-186 |

Number of pages | 10 |

ISBN (Electronic) | 9781538691588 |

DOIs | |

State | Published - Dec 27 2018 |

Event | 18th IEEE International Conference on Data Mining, ICDM 2018 - Singapore, Singapore Duration: Nov 17 2018 → Nov 20 2018 |

### Publication series

Name | Proceedings - IEEE International Conference on Data Mining, ICDM |
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Volume | 2018-November |

ISSN (Print) | 1550-4786 |

### Conference

Conference | 18th IEEE International Conference on Data Mining, ICDM 2018 |
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Country/Territory | Singapore |

City | Singapore |

Period | 11/17/18 → 11/20/18 |

## Keywords

- Graph representation
- Kronecker hulls
- Network convex hull
- Network shapes

## ASJC Scopus subject areas

- General Engineering