ParaMor: Finding Paradigms across Morphology1

ParaMor automatically learns morphological paradigms from unlabelled text, and uses them to annotate word forms with morpheme boundaries. ParaMor competed in the English and German tracks of Morpho Challenge 2007 (Kurimo et al., 2008). In English, ParaMor’s balanced precision and recall outperform at F1 an already sophisticated baseline induction algorithm, Morfessor (Creutz, 2006). In German, ParaMor suffers from a low morpheme recall. But combining ParaMor’s analyses with analyses from Morfessor results in a set of analyses that outperform either algorithm alone, and that place first in F1 among all algorithms submitted to Morpho Challenge 2007. Categories and Subject Descriptions: I.2 [Artificial Intelligence]: I.2.7 Natural Language Processing