An Evolutionary Algorithm Approach to Link Prediction in Dynamic Social Networks

TL;DR

This paper introduces an evolutionary algorithm-based method for predicting future links in large, dynamic social networks, demonstrating high precision and fast convergence on Twitter data.

Contribution

It applies the Covariance Matrix Adaptation Evolution Strategy (CMA-ES) to optimize link prediction in evolving networks, integrating multiple similarity indices.

Findings

High precision in top twenty link predictions

Fast convergence of the evolutionary algorithm

Effective application to large-scale Twitter networks

Abstract

Many real world, complex phenomena have underlying structures of evolving networks where nodes and links are added and removed over time. A central scientific challenge is the description and explanation of network dynamics, with a key test being the prediction of short and long term changes. For the problem of short-term link prediction, existing methods attempt to determine neighborhood metrics that correlate with the appearance of a link in the next observation period. Recent work has suggested that the incorporation of topological features and node attributes can improve link prediction. We provide an approach to predicting future links by applying the Covariance Matrix Adaptation Evolution Strategy (CMA-ES) to optimize weights which are used in a linear combination of sixteen neighborhood and node similarity indices. We examine a large dynamic social network with over $10^6$ nodes (Twitter reciprocal reply networks), both as a test of our general method and as a problem of scientific interest in itself. Our method exhibits fast convergence and high levels of precision for the top twenty predicted links. Based on our findings, we suggest possible factors which may be driving the evolution of Twitter reciprocal reply networks.