Tunneling on Wheeler Graphs

Abstract

The Burrows-Wheeler Transform (BWT) is an important technique both in data compression and in the design of compact indexing data structures. It has been generalized from single strings to collections of strings and some classes of labeled directed graphs, such as tries and de Bruijn graphs. The BWTs of repetitive datasets are often compressible using run-length compression, but recently Baier (CPM 2018) described how they could be even further compressed using an idea he called tunneling. In this paper we show that tunneled BWTs can still be used for indexing and extend tunneling to the BWTs of Wheeler graphs, a framework that includes all the generalizations mentioned above.

11 Pages, 1 figure. This research has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Actions H2020-MSCA-RISE-2015 BIRDS GA No. 690941