edu.umass.cs.mallet.base.pipe

Class TokenSequenceMatchDataAndTarget

java.lang.Object

edu.umass.cs.mallet.base.pipe.Pipe

edu.umass.cs.mallet.base.pipe.TokenSequenceMatchDataAndTarget

All Implemented Interfaces:

Serializable

public class TokenSequenceMatchDataAndTarget
extends Pipe
implements 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

Constructors

Constructor and Description
TokenSequenceMatchDataAndTarget(Pattern regex, int dataGroup, int targetGroup)
TokenSequenceMatchDataAndTarget(String regex, int dataGroup, int targetGroup)

Method Summary

Modifier and Type	Method and Description
Instance	pipe(Instance carrier) Process an Instance.

Methods inherited from class edu.umass.cs.mallet.base.pipe.Pipe

getDataAlphabet, getInstanceId, getParent, getParentRoot, getTargetAlphabet, isDataAlphabetSet, isTargetProcessing, pipe, readResolve, resolveDataAlphabet, resolveTargetAlphabet, setDataAlphabet, setParent, 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(Pattern regex,
                                       int dataGroup,
                                       int targetGroup)

TokenSequenceMatchDataAndTarget

public TokenSequenceMatchDataAndTarget(String regex,
                                       int dataGroup,
                                       int targetGroup)

Method Detail

pipe

public Instance pipe(Instance carrier)

Description copied from class: Pipe

Process an Instance. This method takes an input Instance, destructively modifies it in some way, and returns it. This is the method by which all pipes are eventually run.

One can create a new concrete subclass of Pipe simply by implementing this method.

Specified by:

pipe in class Pipe

Parameters:

carrier - Instance to be processed.