Digital Humanities Colloquium featuring Roald Eiselen

TheSouth African Centre for Digital Language Resources (SADiLaR)is a new research infrastructure set up by the Department of Science and Innovation (DSI) forming part of the new South African Research Infrastructure Roadmap (SARIR)

SADiLaR

A case study exploring how domain shifts affect part-of-speech tagger performance in isiZulu and Sepedi.

Ugh, your tagger is useless! A case study of domain transfer for part of speech taggers in two South African languagesAutomatic language processing tools, such as POS taggers and named entity recognisers, can be very useful in both linguistic and digital humanities research for automatically annotating large amounts of data to find underlying structural patterns. However, when models are applied or evaluated on data from different domains, for example from newspapers to novels, there is generally a substantial loss in performance. This loss in accuracy can be jarring and lead researchers to become discouraged to use these tools.In this talk, the speaker will discuss the impact that switching domains has on the quality of part of speech taggers for two South African languages, isiZulu and Sepedi. Through a series of structured experiments on five different domains, he will show how this impact can be mitigated and how researcher expectations can be managed when using these tools.

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