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A Theoretical and Experimental Analysis of BWT Variants for String Collections

Authors Davide Cenzato , Zsuzsanna Lipták



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Author Details

Davide Cenzato
  • Department of Computer Science, University of Verona, Italy
Zsuzsanna Lipták
  • Department of Computer Science, University of Verona, Italy

Acknowledgements

We would like to thank Massimiliano Rossi who supplied us with some cleaned and filtered datasets.

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Davide Cenzato and Zsuzsanna Lipták. A Theoretical and Experimental Analysis of BWT Variants for String Collections. In 33rd Annual Symposium on Combinatorial Pattern Matching (CPM 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 223, pp. 25:1-25:18, Schloss Dagstuhl - Leibniz-Zentrum für Informatik (2022)
https://doi.org/10.4230/LIPIcs.CPM.2022.25

Abstract

The extended Burrows-Wheeler-Transform (eBWT), introduced by Mantaci et al. [Theor. Comput. Sci., 2007], is a generalization of the Burrows-Wheeler-Transform (BWT) to multisets of strings. While the original BWT is based on the lexicographic order, the eBWT uses the omega-order, which differs from the lexicographic order in important ways. A number of tools are available that compute the BWT of string collections; however, the data structures they generate in most cases differ from the one originally defined, as well as from each other. In this paper, we review the differences between these BWT variants, both from a theoretical and from a practical point of view, comparing them on several real-life datasets with different characteristics. We find that the differences can be extensive, depending on the dataset characteristics, and are largest on collections of many highly similar short sequences. The widely-used parameter r, the number of runs of the BWT, also shows notable variation between the different BWT variants; on our datasets, it varied by a multiplicative factor of up to 4.2.

Subject Classification

ACM Subject Classification
  • Theory of computation → Data compression
  • Applied computing → Bioinformatics
Keywords
  • Burrows-Wheeler-Transform
  • extended BWT
  • string collections
  • repetitiveness measures
  • r
  • compression

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