Efficient Batch One-Hop Personalized PageRanks

Personalized PageRank (PPR) is a classic measure of the relevance among different nodes in a graph. Existing work on PPR has mainly focused on three general types of queries, namely, single-pair PPR, single-source PPR, and all-pair PPR. However, there are applications that rely on a new query type (referred to as batch one-hop PPR), which takes as input a set S of source nodes and, for each node s in S and each of s's neighbor v, asks for the PPR value of v with respect to s. None of the existing PPR algorithms is able to efficiently process batch one-hop queries, due to the inherent differences between batch one-hop PPR and the three general query types. To address the limitations of existing algorithms, this paper presents Baton, an algorithm for batch one-hop PPR that offers strong practical efficiency.