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java.lang.Objectopennlp.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 | |
|---|---|
static String |
NEXT_PREFIX
|
static String |
PREV_PREFIX
|
| Constructor Summary | |
|---|---|
WindowFeatureGenerator(AdaptiveFeatureGenerator... generators)
Initializes the current instance 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 | |
|---|---|
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Informs the feature generator that the context of the adaptive data (typically a document) is no longer valid.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()
|
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 |
|---|
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait |
| Field Detail |
|---|
public static final String PREV_PREFIX
public static final String NEXT_PREFIX
| Constructor Detail |
|---|
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 - feature generatorpublic WindowFeatureGenerator(AdaptiveFeatureGenerator... generators)
generators - array of feature generators| Method Detail |
|---|
public void createFeatures(List<String> features,
String[] tokens,
int index,
String[] preds)
AdaptiveFeatureGenerator
createFeatures in interface AdaptiveFeatureGeneratorfeatures - 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 AdaptiveFeatureGeneratortokens - 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 AdaptiveFeatureGeneratorpublic String toString()
toString in class Object
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