Mining Top-k Relevant Patterns using Minimum Support Raising

Abstract

One practical inconvenience in frequent pattern mining is that it often yields a flood of common or uninformative patterns, and thus we should carefully adjust the minimum support. To alleviate this inconvenience, based on FP-growth, this paper proposes RP-growth, an efficient algorithm for top-k mining of discriminative patterns which are highly relevant to the class of interest. RP-growth conducts a branch-and-bound search using anti-monotonic upper bounds of the relevance scores such as F-score and 2, and the pruning in branch-and-bound search is successfully translated to minimum support raising, a standard, easy-to-implement pruning strategy for top-k mining. Furthermore, by introducing the notion of weakness and an additional, aggressive pruning strategy based on weakness, RP-growth efficiently find k patterns of wide variety and high relevance to the class of interest.