nltk.tag.senna

Senna POS tagger, NER Tagger, Chunk Tagger

The input is: - path to the directory that contains SENNA executables. If the path is incorrect,

SennaTagger will automatically search for executable file specified in SENNA environment variable

• (optionally) the encoding of the input data (default:utf-8)

Note: Unit tests for this module can be found in test/unit/test_senna.py

>>> from nltk.tag import SennaTagger
>>> tagger = SennaTagger('/usr/share/senna-v3.0')
>>> tagger.tag('What is the airspeed of an unladen swallow ?'.split()) # doctest: +SKIP
[('What', 'WP'), ('is', 'VBZ'), ('the', 'DT'), ('airspeed', 'NN'),
('of', 'IN'), ('an', 'DT'), ('unladen', 'NN'), ('swallow', 'NN'), ('?', '.')]

>>> from nltk.tag import SennaChunkTagger
>>> chktagger = SennaChunkTagger('/usr/share/senna-v3.0')
>>> chktagger.tag('What is the airspeed of an unladen swallow ?'.split()) # doctest: +SKIP
[('What', 'B-NP'), ('is', 'B-VP'), ('the', 'B-NP'), ('airspeed', 'I-NP'),
('of', 'B-PP'), ('an', 'B-NP'), ('unladen', 'I-NP'), ('swallow', 'I-NP'),
('?', 'O')]

>>> from nltk.tag import SennaNERTagger
>>> nertagger = SennaNERTagger('/usr/share/senna-v3.0')
>>> nertagger.tag('Shakespeare theatre was in London .'.split()) # doctest: +SKIP
[('Shakespeare', 'B-PER'), ('theatre', 'O'), ('was', 'O'), ('in', 'O'),
('London', 'B-LOC'), ('.', 'O')]
>>> nertagger.tag('UN headquarters are in NY , USA .'.split()) # doctest: +SKIP
[('UN', 'B-ORG'), ('headquarters', 'O'), ('are', 'O'), ('in', 'O'),
('NY', 'B-LOC'), (',', 'O'), ('USA', 'B-LOC'), ('.', 'O')]