cc.mallet.pipe
Class TokenSequenceMatchDataAndTarget

java.lang.Object
  cc.mallet.pipe.Pipe
      cc.mallet.pipe.TokenSequenceMatchDataAndTarget

All Implemented Interfaces:

AlphabetCarrying, java.io.Serializable

public class TokenSequenceMatchDataAndTarget
extends Pipe
implements java.io.Serializable

Run a regular expression over the text of each token; replace the text with the substring matching one regex group; create a target TokenSequence from the text matching another regex group.

For example, if you have a data file containing one line per token, and the label also appears on that line, you can first get a TokenSequence in which the text of each line is the Token.getText() of each token, then run this pipe, and separate the target information from the data information. For example to process the following,

         BACKGROUND Then
         PERSON Mr.
         PERSON Smith
         BACKGROUND said
         ...
         

use new TokenSequenceMatchDataAndTarget (Pattern.compile ("([A-Z]+) (.*)"), 2, 1).

Author:

Andrew McCallum mccallum@cs.umass.edu

See Also:

Serialized Form

Constructor Summary

TokenSequenceMatchDataAndTarget(java.util.regex.Pattern regex, int dataGroup, int targetGroup)

TokenSequenceMatchDataAndTarget(java.lang.String regex, int dataGroup, int targetGroup)

Method Summary

Instance

pipe(Instance carrier) Really this should be 'protected', but isn't for historical reasons.

Methods inherited from class cc.mallet.pipe.Pipe

alphabetsMatch, getAlphabet, getAlphabets, getDataAlphabet, getInstanceId, getTargetAlphabet, instanceFrom, instancesFrom, instancesFrom, isDataAlphabetSet, isTargetProcessing, newIteratorFrom, preceedingPipeDataAlphabetNotification, preceedingPipeTargetAlphabetNotification, precondition, readResolve, setDataAlphabet, setOrCheckDataAlphabet, setOrCheckTargetAlphabet, setTargetAlphabet, setTargetProcessing

Methods inherited from class java.lang.Object

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

Constructor Detail

TokenSequenceMatchDataAndTarget

public TokenSequenceMatchDataAndTarget(java.util.regex.Pattern regex,
                                       int dataGroup,
                                       int targetGroup)

TokenSequenceMatchDataAndTarget

public TokenSequenceMatchDataAndTarget(java.lang.String regex,
                                       int dataGroup,
                                       int targetGroup)

Method Detail

pipe

public Instance pipe(Instance carrier)

Description copied from class: Pipe

Really this should be 'protected', but isn't for historical reasons.

Overrides:

pipe in class Pipe