BrownCluster (Apache OpenNLP Tools 2.2.0 API)

java.lang.Object
- opennlp.tools.util.featuregen.BrownCluster

All Implemented Interfaces:

SerializableArtifact
```
public class BrownCluster
extends Object
implements SerializableArtifact
```
Class to load a Brown cluster document: word\tword_class\tprob
Originally available at: http://metaoptimize.com/projects/wordreprs/. Further details can be found in the related research paper.
The file containing the clustering lexicon has to be passed as the value of the dict attribute of each BrownCluster feature generator.

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class BrownCluster.BrownClusterSerializer

Constructor Summary

Constructors
Constructor Description

BrownCluster(InputStream in)
Generates the token to cluster map from Brown cluster an InputStream.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`Class<?>`	`getArtifactSerializerClass()`	Retrieves the class which can serialize and recreate this artifact.
`String`	`lookupToken(String string)`	Check if a token is in the Brown:paths, token map.
`void`	`serialize(OutputStream out)`

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - BrownCluster
```
public BrownCluster(InputStream in)
             throws IOException
```
    Generates the token to cluster map from Brown cluster an InputStream.
    Note: we only add those tokens with frequency bigger than 5.
    
    Parameters:
    
    in - A valid, open InputStream to read from.
    
    Throws:
    
    IOException - the io exception
- Method Detail
  - lookupToken
```
public String lookupToken(String string)
```
    Check if a token is in the Brown:paths, token map.
    
    Parameters:
    
    string - the token to look-up
    
    Returns:
    
    the brown class if such token is in the brown cluster map
  - serialize
```
public void serialize(OutputStream out)
               throws IOException
```
    Throws:
    
    IOException
  - getArtifactSerializerClass
```
public Class<?> getArtifactSerializerClass()
```
    Description copied from interface: SerializableArtifact
    
    Retrieves the class which can serialize and recreate this artifact.
    Note: The serializer class must have a public zero argument constructor or an exception is thrown during model serialization/loading.
    
    Specified by:
    
    getArtifactSerializerClass in interface SerializableArtifact
    
    Returns:
    
    The corresponding ArtifactSerializer class.