The RFTagger is a tool for the annotation of text with fine-grained part-of-speech tags. It has been trained on German, Czech, Slovene, and Hungarian data.

The tagger is described in the following paper:

Helmut Schmid and Florian Laws: "Estimation of Conditional Probabilities with Decision Trees and an Application to Fine-Grained POS Tagging" (pdf)

Here is some sample output:

word	part of speech
Das	PRO.Dem.Subst.-3.Nom.Sg.Neut
ist	VFIN.Sein.3.Sg.Pres.Ind
ein	ART.Indef.Nom.Sg.Masc
Testsatz	N.Reg.Nom.Sg.Masc
.	SYM.Pun.Sent

Download

The source code of the RFTagger can be downloaded here. It comes with parameter files for German, Czech, Slovene, and Hungarian (Linux PCs only) and is freely available for education, research and other non-commercial puposes.

Publication

Please cite the following publication if you want to refer to the RFTagger:

Helmut Schmid and Florian Laws: Estimation of Conditional Probabilities with Decision Trees and an Application to Fine-Grained POS Tagging, COLING 2008, Manchester, Great Britain. (pdf)

Links

• Java interface to the RFTagger developed by Niels Ott and Ramon Ziai