Abstract:
Infection source identification is a well-established problem, having gained a substantial scale of research attention over the years.
In this paper, we study the problem by exploiting the idea of the
source being the oldest node. For the same, we propose a novel
algorithm called Exoneration and Prominence based Age (EPA),
which calculates the age of an infected node by considering its
prominence in terms of its both infected and non-infected neighbors. These non-infected neighbors hold the key in exonerating
an infected node from being the infection source. We also propose
a computationally inexpensive variant of EPA, called EPA-LW. Extensive experiments are performed on seven datasets, including
5 real-world and 2 synthetic, of different topologies and varying
sizes to demonstrate the effectiveness of the proposed algorithms.
We consistently outperform the state-of-the-art single source identification methods in terms of average error distance. To the best
of our knowledge, this is the largest scale performance evaluation
of the considered problem till date. We also extend EPA to identify
multiple sources by developing two new algorithms - one based
on K-Means, called EPA_K-Means, and another based on successive identification of sources, called EPA_SSI. Our results show that
both EPA_K-Means and EPA_SSI outperform the other multi-source
heuristic approaches.
