org.tribuo.classification.sequence.viterbi

Class DefaultFeatureExtractor

java.lang.Object

org.tribuo.classification.sequence.viterbi.DefaultFeatureExtractor

All Implemented Interfaces:

com.oracle.labs.mlrg.olcut.config.Configurable, com.oracle.labs.mlrg.olcut.provenance.Provenancable<com.oracle.labs.mlrg.olcut.provenance.ConfiguredObjectProvenance>, Serializable, LabelFeatureExtractor

public class DefaultFeatureExtractor
extends Object
implements LabelFeatureExtractor

A label feature extractor that produces several kinds of label-based features.

The options are: the most recent output, the least recent output, recent bigrams, recent trigrams, recent 4-grams.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DefaultFeatureExtractor()
DefaultFeatureExtractor(int mostRecentOutcome, int leastRecentOutcome, boolean useBigram, boolean useTrigram, boolean use4gram)

Method Summary

Modifier and Type	Method and Description
List<Feature>	extractFeatures(List<Label> previousOutcomes, double value) Generates features based on the previously produced labels.
com.oracle.labs.mlrg.olcut.provenance.ConfiguredObjectProvenance	getProvenance()
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface com.oracle.labs.mlrg.olcut.config.Configurable

postConfig

Constructor Detail

DefaultFeatureExtractor

public DefaultFeatureExtractor()

DefaultFeatureExtractor

public DefaultFeatureExtractor(int mostRecentOutcome,
                               int leastRecentOutcome,
                               boolean useBigram,
                               boolean useTrigram,
                               boolean use4gram)

Method Detail

toString

public String toString()

Overrides:

toString in class Object

extractFeatures

public List<Feature> extractFeatures(List<Label> previousOutcomes,
                                     double value)

Description copied from interface: LabelFeatureExtractor

Generates features based on the previously produced labels.

Specified by:

extractFeatures in interface LabelFeatureExtractor

Parameters:

previousOutcomes - The previous step's labels.

value - The value to give to the features.

Returns:

Features.

getProvenance

public com.oracle.labs.mlrg.olcut.provenance.ConfiguredObjectProvenance getProvenance()

Specified by:

getProvenance in interface com.oracle.labs.mlrg.olcut.provenance.Provenancable<com.oracle.labs.mlrg.olcut.provenance.ConfiguredObjectProvenance>