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java.lang.Object opennlp.tools.util.featuregen.WindowFeatureGenerator
public class WindowFeatureGenerator
Generates previous and next features for a given AdaptiveFeatureGenerator
.
The window size can be specified.
Features:
Current token is always included unchanged
Previous tokens are prefixed with p distance
Next tokens are prefix with n distance
Field Summary | |
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static String |
NEXT_PREFIX
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static String |
PREV_PREFIX
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Constructor Summary | |
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WindowFeatureGenerator(AdaptiveFeatureGenerator... generators)
Initializes the current isntance with the given parameters. |
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WindowFeatureGenerator(AdaptiveFeatureGenerator generator)
Initializes the current instance. |
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WindowFeatureGenerator(AdaptiveFeatureGenerator generator,
int prevWindowSize,
int nextWindowSize)
Initializes the current instance with the given parameters. |
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WindowFeatureGenerator(int prevWindowSize,
int nextWindowSize,
AdaptiveFeatureGenerator... generators)
Initializes the current instance with the given parameters. |
Method Summary | |
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void |
clearAdaptiveData()
Informs the feature generator that the context of the adaptive data (typically a document) is no longer valid. |
void |
createFeatures(List<String> features,
String[] tokens,
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. |
String |
toString()
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void |
updateAdaptiveData(String[] tokens,
String[] outcomes)
Informs the feature generator that the specified tokens have been classified with the corresponding set of specified outcomes. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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public static final String PREV_PREFIX
public static final String NEXT_PREFIX
Constructor Detail |
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public WindowFeatureGenerator(AdaptiveFeatureGenerator generator, int prevWindowSize, int nextWindowSize)
generator
- Feature generator to apply to the window.prevWindowSize
- Size of the window to the left of the current token.nextWindowSize
- Size of the window to the right of the current token.public WindowFeatureGenerator(int prevWindowSize, int nextWindowSize, AdaptiveFeatureGenerator... generators)
prevWindowSize
- nextWindowSize
- generators
- public WindowFeatureGenerator(AdaptiveFeatureGenerator generator)
generator
- public WindowFeatureGenerator(AdaptiveFeatureGenerator... generators)
generators
- Method Detail |
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public void createFeatures(List<String> features, String[] tokens, int index, String[] preds)
AdaptiveFeatureGenerator
createFeatures
in interface AdaptiveFeatureGenerator
features
- The list of features to be added to.tokens
- 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.public void updateAdaptiveData(String[] tokens, String[] outcomes)
AdaptiveFeatureGenerator
updateAdaptiveData
in interface AdaptiveFeatureGenerator
tokens
- The tokens of the sentence or other text unit which has been processed.outcomes
- The outcomes associated with the specified tokens.public void clearAdaptiveData()
AdaptiveFeatureGenerator
clearAdaptiveData
in interface AdaptiveFeatureGenerator
public String toString()
toString
in class Object
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