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apertium-tagger − This application is part of ( apertium )

This tool is part of the apertium open-source machine translation architecture:


apertium-tagger −−train|−t {n} DIC CRP TSX PROB [−−debug|−d]

apertium-tagger −−supervised|−s {n} DIC CRP TSX PROB HTAG UNTAG [−−debug|−d]

apertium-tagger −−retrain|−r {n} CRP PROB [−−debug|−d]

apertium-tagger −−tagger|−g [−−first|−f] PROB [−−debug|−d] [INPUT [OUTPUT]]


apertium-tagger is the application responsible of the apertium part-of-speech tagger training or tagging, depending on the calling options. This command only reads from the standard input if the option −−tagger or −g is used.


−t {n}, −−train {n}

Initializes parameters through the Kupiec’s method (unsupervised), then performs n iterations of the Baum-Welch training algorithm (unsupervised).

−s {n}, −−supervised {n}

Initializes parameters against a hand-tagged text (supervised) through the maximum likelihood estimate method, then performs n iterations of the Baum-Welch training algorithm (unsupervised)

−r {n}, −−retrain {n}

Retrains the model with n additional Baum-Welch iterations (unsupervised).

−g, −−tagger

Tags input text by means of Viterbi algorithm.

−f, −−first

Used if conjuntion with -g (--tagger) makes the tagger to give all lexical forms of each word, being the choosen one in the first place (after the lemma)

−d, −−debug

Print error (if any) or debug messages while operating.

−h, −−help

Display a help message.


These are the kinds of files used with each option:

DIC Full expanded dictionary file

CRP Training text corpus file

TSX Tagger specification file, in XML format

PROB Tagger data file, built in the training and used while tagging

HTAG Hand-tagged text corpus

UNTAG Untagged text corpus, morphological analysis of HTAG corpus to use both jointly with -s option

INPUT Input file, stdin by default

OUTPUT Output file, stdout by default


lt-proc(1), lt-comp(1), lt-expand(1), apertium-translator(1), apertium(1).


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Copyright (c) 2005, 2006 Universitat d’Alacant / Universidad de Alicante. This is free software. You may redistribute copies of it under the terms of the GNU General Public License <>.