Difference between revisions of "Part of Speech Tagging"
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Some common approaches to POS Tagging include the following: | Some common approaches to POS Tagging include the following: | ||
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* Hidden Markov Models based approaches | * Hidden Markov Models based approaches | ||
* Dynamic Programming/Viterbi-like algorithms (DeRose & Church) | * Dynamic Programming/Viterbi-like algorithms (DeRose & Church) | ||
| − | * | + | * Unsupervised approaches: Brill Tagger (Transformation-based learning), Constraint Grammar, Forward-Backward |
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== Example Systems == | == Example Systems == | ||
| − | * ... | + | * [http://www.markwatson.com/opensource/ FastTag] - open source implementation of Brill Tagger |
| + | * [http://opennlp.sourceforge.net/ OpenNLP Tagger] - based on maximum entropy | ||
| + | * [http://crftagger.sourceforge.net/ CRF Tagger] - based on conditional random fields | ||
| + | * [http://alias-i.com/lingpipe/ LingPipe] - tool kit that contains models for POS tagging | ||
== References / Links == | == References / Links == | ||
* Wikipedia article on Part of Speech Tagging - [http://en.wikipedia.org/wiki/Part-of-speech_tagging] | * Wikipedia article on Part of Speech Tagging - [http://en.wikipedia.org/wiki/Part-of-speech_tagging] | ||
| + | * Webpage with download links to many different POS taggers, from Statistical natural language processing and corpus-based computational linguistics: An annotated list of resources - [http://www-nlp.stanford.edu/links/statnlp.html#Taggers] | ||
Revision as of 19:05, 31 October 2010
Summary
Part of Speech Tagging (or POS Tagging for short) is a task in the field of computational linguistics which looks at marking a text corpus with the associated word categories known as parts of speech to words.
Common Approaches
Some common approaches to POS Tagging include the following:
- Hidden Markov Models based approaches
- Dynamic Programming/Viterbi-like algorithms (DeRose & Church)
- Unsupervised approaches: Brill Tagger (Transformation-based learning), Constraint Grammar, Forward-Backward
Example Systems
- FastTag - open source implementation of Brill Tagger
- OpenNLP Tagger - based on maximum entropy
- CRF Tagger - based on conditional random fields
- LingPipe - tool kit that contains models for POS tagging
