public class WindowFeatureGenerator extends Object implements AdaptiveFeatureGenerator
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| Modifier and Type | Field and Description |
|---|---|
static String |
NEXT_PREFIX |
static String |
PREV_PREFIX |
| Constructor and Description |
|---|
WindowFeatureGenerator(AdaptiveFeatureGenerator... generators)
Initializes the current instance with the given parameters.
|
WindowFeatureGenerator(AdaptiveFeatureGenerator generator)
Initializes the current instance.
|
WindowFeatureGenerator(AdaptiveFeatureGenerator generator,
int prevWindowSize,
int nextWindowSize)
Initializes the current instance with the given parameters.
|
WindowFeatureGenerator(int prevWindowSize,
int nextWindowSize,
AdaptiveFeatureGenerator... generators)
Initializes the current instance with the given parameters.
|
| Modifier and Type | Method and Description |
|---|---|
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is no longer valid.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.
|
public static final String PREV_PREFIX
public static final String NEXT_PREFIX
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 generatorspublic void createFeatures(List<String> features, String[] tokens, int index, String[] preds)
AdaptiveFeatureGeneratorcreateFeatures 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)
AdaptiveFeatureGeneratorupdateAdaptiveData 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()
AdaptiveFeatureGeneratorclearAdaptiveData in interface AdaptiveFeatureGeneratorCopyright © 2017 The Apache Software Foundation. All rights reserved.