edu.umass.cs.mallet.base.pipe
Class TargetRememberLastLabel

java.lang.Object
  extended byedu.umass.cs.mallet.base.pipe.Pipe
      extended byedu.umass.cs.mallet.base.pipe.TargetRememberLastLabel
All Implemented Interfaces:
java.io.Serializable

public class TargetRememberLastLabel
extends Pipe

For each position in the target, remember the last non-background label. Assumes that the target of piped instances is a LabelSequence. Replaces the target with a LabelsSequence where row 0 is the original labels, and row 1 is the last label.

See Also:
Serialized Form

Constructor Summary
TargetRememberLastLabel()
           
TargetRememberLastLabel(java.lang.String backgroundLabel, boolean offset)
          offset determines how the memory and base sequences will be aligned.
 
Method Summary
 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

TargetRememberLastLabel

public TargetRememberLastLabel()

TargetRememberLastLabel

public TargetRememberLastLabel(java.lang.String backgroundLabel,
                               boolean offset)
offset determines how the memory and base sequences will be aligned. If true, they'll be aligned like this:
  MEM   O  O  S  S  S  E  L
  BASE  O  S  S  O  E  L  O
 
otherwise, they'll be aligned like this:
  MEM   O  S  S  S  E  E  L
  BASE  O  S  S  O  E  L  O
 

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.