Package opennlp.tools.chunker

Klasse DefaultChunkerContextGenerator

java.lang.Object

opennlp.tools.chunker.DefaultChunkerContextGenerator

Alle implementierten Schnittstellen:

ChunkerContextGenerator, BeamSearchContextGenerator<TokenTag>

public class DefaultChunkerContextGenerator
extends Object
implements ChunkerContextGenerator

Features based on chunking model described in Fei Sha and Fernando Pereira. Shallow parsing with conditional random fields. In Proceedings of HLT-NAACL 2003. Association for Computational Linguistics, 2003.

Konstruktorübersicht

Konstruktoren

Konstruktor	Beschreibung
DefaultChunkerContextGenerator()	Initializes a DefaultChunkerContextGenerator instance.

Methodenübersicht

Modifizierer und Typ	Methode	Beschreibung
String[]	getContext(int i, String[] toks, String[] tags, String[] preds)	Retrieves the contexts for chunking of the specified idx.
String[]	getContext(int index, TokenTag[] sequence, String[] priorDecisions, Object[] additionalContext)	Returns the context for the specified position in the specified sequence (list).

Von Klasse geerbte Methoden java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Konstruktordetails

DefaultChunkerContextGenerator

public DefaultChunkerContextGenerator()

Initializes a DefaultChunkerContextGenerator instance.

Methodendetails

getContext

public String[] getContext(int i,
 String[] toks,
 String[] tags,
 String[] preds)

Beschreibung aus Schnittstelle kopiert: ChunkerContextGenerator

Retrieves the contexts for chunking of the specified idx.

Angegeben von:

getContext in Schnittstelle ChunkerContextGenerator

Parameter:

i - The index of the token in the specified toks array for which the context should be constructed.

toks - The tokens of the sentence. The toString methods of these objects should return the token text.

tags - The POS tags for the specified tokens.

preds - The previous decisions made in the tagging of this sequence. Only indices less than idx will be examined.

Gibt zurück:

An array of predictive contexts on which a model basis its decisions.

getContext

public String[] getContext(int index,
 TokenTag[] sequence,
 String[] priorDecisions,
 Object[] additionalContext)

Beschreibung aus Schnittstelle kopiert: BeamSearchContextGenerator

Returns the context for the specified position in the specified sequence (list).

Angegeben von:

getContext in Schnittstelle BeamSearchContextGenerator<TokenTag>

Parameter:

index - The index of the sequence.

sequence - The sequence of items over which the beam search is performed.

priorDecisions - The sequence of decisions made prior to the context for which this decision is being made.

additionalContext - Any additional context specific to a class implementing this interface.

Gibt zurück:

The context for the specified index in the specified sequence.