Package opennlp.tools.lemmatizer

Class DefaultLemmatizerContextGenerator

java.lang.Object

opennlp.tools.lemmatizer.DefaultLemmatizerContextGenerator

All Implemented Interfaces:

LemmatizerContextGenerator, BeamSearchContextGenerator<String>

public class DefaultLemmatizerContextGenerator
extends Object
implements LemmatizerContextGenerator

Simple feature generator for learning statistical lemmatizers.

Features based on Grzegorz Chrupała. 2008. Towards a Machine-Learning Architecture for Lexical Functional Grammar Parsing. PhD dissertation, Dublin City University

Constructor Summary

Constructors

Constructor	Description
DefaultLemmatizerContextGenerator()

Method Summary

Modifier and Type	Method	Description
String[]	getContext(int index, String[] sequence, String[] priorDecisions, Object[] additionalContext)	Returns the context for the specified position in the specified sequence (list).
String[]	getContext(int index, String[] toks, String[] tags, String[] preds)	Returns the contexts for lemmatizing of the specified index.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultLemmatizerContextGenerator

public DefaultLemmatizerContextGenerator()

Method Detail

getContext

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

Description copied from interface: BeamSearchContextGenerator

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

Specified by:

getContext in interface BeamSearchContextGenerator<String>

Parameters:

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 addition context specific to a class implementing this interface.

Returns:

The context for the specified index in the specified sequence.

getContext

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

Description copied from interface: LemmatizerContextGenerator

Returns the contexts for lemmatizing of the specified index.

Specified by:

getContext in interface LemmatizerContextGenerator

Parameters:

index - 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 toks.

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

Returns:

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