edu.umass.cs.mallet.base.pipe.tsf

Class Target2BIOFormat

java.lang.Object

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

edu.umass.cs.mallet.base.pipe.tsf.Target2BIOFormat

All Implemented Interfaces:

Serializable

public class Target2BIOFormat
extends Pipe
implements Serializable

Creates a LabelSequence out of a TokenSequence that is the target of an Instance. Labels are constructed out of each Token in the TokenSequence to conform with BIO format (Begin, Inside, Outside of Segment). Prepends a "B-" to Tokens that leave a background state and an "I-" to tags that have the same label as the previous Token. NOTE: This class assumes that subsequent identical tags belong to the same Segment. This means that you cannot have B B I, only B I I.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Target2BIOFormat()
Target2BIOFormat(String background)

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

Target2BIOFormat

public Target2BIOFormat()

Target2BIOFormat

public Target2BIOFormat(String background)

Parameters:

background - represents Tokens that are not part of a target Segment.

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.