opennlp.tools.util.featuregen
Class TokenPatternFeatureGenerator

java.lang.Object
  opennlp.tools.util.featuregen.FeatureGeneratorAdapter
      opennlp.tools.util.featuregen.TokenPatternFeatureGenerator

All Implemented Interfaces:

AdaptiveFeatureGenerator

public class TokenPatternFeatureGenerator
extends FeatureGeneratorAdapter

Partitions tokens into sub-tokens based on character classes and generates class features for each of the sub-tokens and combinations of those sub-tokens.

Constructor Summary

TokenPatternFeatureGenerator()
Initializes a new instance.

TokenPatternFeatureGenerator(Tokenizer supportTokenizer)
Initializes a new instance.

Method Summary

void	createFeatures(List<String> feats, String[] toks, int index, String[] preds) Adds the appropriate features for the token at the specified index with the specified array of previous outcomes to the specified list of features.

Methods inherited from class opennlp.tools.util.featuregen.FeatureGeneratorAdapter

clearAdaptiveData, updateAdaptiveData

Methods inherited from class java.lang.Object

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

Constructor Detail

TokenPatternFeatureGenerator

public TokenPatternFeatureGenerator()

Initializes a new instance. For tokinization the SimpleTokenizer is used.

TokenPatternFeatureGenerator

public TokenPatternFeatureGenerator(Tokenizer supportTokenizer)

Initializes a new instance.

Parameters:

supportTokenizer -

Method Detail

createFeatures

public void createFeatures(List<String> feats,
                           String[] toks,
                           int index,
                           String[] preds)

Description copied from interface: AdaptiveFeatureGenerator

Adds the appropriate features for the token at the specified index with the specified array of previous outcomes to the specified list of features.

Parameters:

feats - The list of features to be added to.

toks - The tokens of the sentence or other text unit being processed.

index - The index of the token which is currently being processed.

preds - The outcomes for the tokens prior to the specified index.