Package opennlp.tools.namefind

Class NameFinderEventStream

java.lang.Object

opennlp.tools.util.AbstractEventStream<NameSample>

opennlp.tools.namefind.NameFinderEventStream

All Implemented Interfaces:

AutoCloseable, ObjectStream<Event>

public class NameFinderEventStream
extends AbstractEventStream<NameSample>

Class for creating an event stream out of data files for training an TokenNameFinder.

Constructor Summary

Constructors

Constructor	Description
NameFinderEventStream(ObjectStream<NameSample> dataStream, String type, NameContextGenerator contextGenerator, SequenceCodec<String> codec)	Initializes a NameFinderEventStream using the specified dataStream and NameContextGenerator.

Method Summary

Modifier and Type	Method	Description
static String[][]	additionalContext(String[] tokens, Map<String,String> prevMap)	Generated previous decision features for each token based on contents of the specified prevMap.
static List<Event>	generateEvents(String[] sentence, String[] outcomes, NameContextGenerator cg)	Generates events for each token in a sentence with the specified outcomes using the specified NameContextGenerator.
static String[]	generateOutcomes(Span[] names, String type, int length)	Deprecated. use the BioCodec implementation of the SequenceValidator instead!

Methods inherited from class opennlp.tools.util.AbstractEventStream

close, read, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

NameFinderEventStream

public NameFinderEventStream(ObjectStream<NameSample> dataStream,
                             String type,
                             NameContextGenerator contextGenerator,
                             SequenceCodec<String> codec)

Initializes a NameFinderEventStream using the specified dataStream and NameContextGenerator.

Parameters:

dataStream - The data stream of events.

type - null or overrides the type parameter in the provided samples.

contextGenerator - The NameContextGenerator used to generate features for the event stream.

codec - The SequenceCodec to use.

Method Detail

generateOutcomes

@Deprecated
public static String[] generateOutcomes(Span[] names,
                                        String type,
                                        int length)

Deprecated.

use the BioCodec implementation of the SequenceValidator instead!

Generates the name tag outcomes (start, continue, other) for each token in a sentence with the specified length using the specified names.

Parameters:

names - Token spans for each of the names.

type - null or overrides the type parameter in the provided samples

length - The length of the sentence.

Returns:

An array of start, continue, other outcomes based on the specified names and sentence length.

generateEvents

public static List<Event> generateEvents(String[] sentence,
                                         String[] outcomes,
                                         NameContextGenerator cg)

Generates events for each token in a sentence with the specified outcomes using the specified NameContextGenerator.

Parameters:

sentence - Token representing a sentence.

outcomes - An array of outcomes.

cg - The NameContextGenerator to use.

Returns:

A list of events generated.

additionalContext

public static String[][] additionalContext(String[] tokens,
                                           Map<String,String> prevMap)

Generated previous decision features for each token based on contents of the specified prevMap.

Parameters:

tokens - The token for which the context is generated.

prevMap - A mapping of tokens to their previous decisions.

Returns:

A 2-dimensional array with additional context with features for each token.