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Noun Phrase

A word or group of words containing a noun and functioning in a sentence as subject, object, or prepositional object.

Noun Phrase Chunker

The NP Chunker application attempts to insert brackets marking noun phrases in text which have been marked with POS tags in the same format as the output of Eric Brill’s transformational tagger.

Using the Chunker

The Chunker requires the Creole plugin ‘Parser_NP_Chunking’ to be loaded. The two loadtime parameters are simply urls pointing at the POS tag dictionary and the rules file, which should be set automatically.

Run time parameters

There are five runtime parameters which should be set prior to executing the chunker.

● annotationName: name of the annotation the chunker should create to identify noun phrases in the text.
● inputASName: The chunker requires certain types of annotations (e.g. Tokens with part of speech tags) for identifying noun chunks. This parameter tells the chunker which annotation set to use to obtain such annotations from.
● outputASName: This is where the results (i.e. new noun chunk annotations will be stored).
● posFeature: Name of the feature that holds POS tag information.
● unknownTag: The chunk tag to use for an unknown POStag.

NPChunkerruntimeparams

Infer Result

npchunkerOutput

New Annotation NounChunk has been created with the nounphrases selected.