Text Analysis with Enhanced Annotated Suffix Trees: Algorithms and Implementation
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We present an improved implementation of the Annotated suffix tree method for text analysis (abbreviated as the AST-method). Annotated suffix trees are an extension of the original suffix tree data structure, with nodes labeled by occurrence frequencies for corresponding substrings in the input text collection. They have a range of interesting applications in text analysis, such as language-independent computation of a matching score for a keyphrase against some text collection. In our enhanced implementation, new algorithms and data structures (suffix arrays used instead of the traditional but heavyweight suffix trees) have enabled us to derive an implementation superior to the previous ones in terms of both memory consumption (10 times less memory) and runtime. We describe an open-source statistical text analysis software package, called “EAST”, which implements this enhanced annotated suffix tree method. Besides, the EAST package includes an adaptation of a distributional synonym extraction algorithm that supports the Russian language and allows us to achieve better results in keyphrase matching.
KeywordsText analysis Algorithms on strings Annotated suffix trees Suffix arrays Synonym extraction
This research carried out in 2015 was supported by “The National Research University ‘Higher School of Economics’ Academic Fund Program” grant ( Open image in new window 15-05-0041). The financial support from the Government of the Russian Federation within the framework of the implementation of the 5–100 Programme Roadmap of the National Research University – Higher School of Economics is acknowledged.
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