Line Graphs of Weighted Networks for Overlapping Communities

TL;DR

This paper introduces a novel method using weighted line graphs to detect overlapping communities in networks, enabling traditional partitioning techniques to be applied to edge-based community detection.

Contribution

The paper proposes a new approach that constructs weighted line graphs to reveal overlapping communities, offering an alternative to node-based methods.

Findings

Effective detection of overlapping communities in social networks

Application to geographical networks demonstrates versatility

Weighted line graphs enhance community detection accuracy

Abstract

In this paper, we develop the idea to partition the edges of a weighted graph in order to uncover overlapping communities of its nodes. Our approach is based on the construction of different types of weighted line graphs, i.e. graphs whose nodes are the links of the original graph, that encapsulate differently the relations between the edges. Weighted line graphs are argued to provide an alternative, valuable representation of the system's topology, and are shown to have important applications in community detection, as the usual node partition of a line graph naturally leads to an edge partition of the original graph. This identification allows us to use traditional partitioning methods in order to address the long-standing problem of the detection of overlapping communities. We apply it to the analysis of different social and geographical networks.