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:

  • Constructor Summary

    Constructors
    Constructor
    Description
    DefaultFeatureExtractor()
    Constructs a default feature extractor for bigrams and trigrams using the past 3 outcomes.
    DefaultFeatureExtractor(int mostRecentOutcome, int leastRecentOutcome, boolean useBigram, boolean useTrigram, boolean use4gram)
    Constructs a default feature extractor using the supplied parameters.

  • Method Summary

    Modifier and Type
    Method
    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 Details

    • DefaultFeatureExtractor

      public DefaultFeatureExtractor()
      Constructs a default feature extractor for bigrams and trigrams using the past 3 outcomes.

    • DefaultFeatureExtractor

      public DefaultFeatureExtractor(int mostRecentOutcome, int leastRecentOutcome, boolean useBigram, boolean useTrigram, boolean use4gram)
      Constructs a default feature extractor using the supplied parameters.
      Parameters:
      mostRecentOutcome - The most recent outcome to include as a feature.
      leastRecentOutcome - The least recent outcome to include as a feature.
      useBigram - Use bigrams of the outcomes.
      useTrigram - Use trigrams of the outcomes.
      use4gram - Use 4-grams of the outcomes.

  • Method Details

    • 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>