edu.illinois.cs.cogcomp.lbj.coref.alignment
Class ExtentToHeadAligner

java.lang.Object
  edu.illinois.cs.cogcomp.lbj.coref.alignment.Aligner<T>
      edu.illinois.cs.cogcomp.lbj.coref.alignment.DefaultAligner<Chunk>
          edu.illinois.cs.cogcomp.lbj.coref.alignment.WordOverlapChunkAligner
              edu.illinois.cs.cogcomp.lbj.coref.alignment.ExtentToHeadAligner

All Implemented Interfaces:

java.io.Serializable

public class ExtentToHeadAligner
extends WordOverlapChunkAligner
implements java.io.Serializable

Aligns objects by number of words overlap, then by closeness of last words. Imposes the restriction that to align, a pair of chunks must be nested.

See Also:

Serialized Form

Field Summary

private static long

serialVersionUID

Constructor Summary

ExtentToHeadAligner()

Method Summary

Chunk	getBestMatch(Chunk m, java.util.Set<Chunk> in) Finds the best match between a mention and a target.
protected int	getEndToEndDist(Chunk a, Chunk b) Gets the distance, in words, between the last word in a and the last word in b.
int	getOverlap(Chunk a, Chunk b) Determines the number of words shared in the heads of the mentions.
boolean	nestedBInA(Chunk a, Chunk b)

Methods inherited from class edu.illinois.cs.cogcomp.lbj.coref.alignment.DefaultAligner

getAlignment

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

Constructor Detail

ExtentToHeadAligner

public ExtentToHeadAligner()

Method Detail

getBestMatch

public Chunk getBestMatch(Chunk m,
                          java.util.Set<Chunk> in)

Description copied from class: DefaultAligner

Finds the best match between a mention and a target. The best match is defined as the target with the greatest overlap.

Overrides:

getBestMatch in class DefaultAligner<Chunk>

Parameters:

m - The mention to match.

in - The possible targets.

Returns:

The best target for m.

getOverlap

public int getOverlap(Chunk a,
                      Chunk b)

Description copied from class: WordOverlapChunkAligner

Determines the number of words shared in the heads of the mentions.

Overrides:

getOverlap in class WordOverlapChunkAligner

Returns:

the number of words overlapping, or 0 if the chunks are not nested.

nestedBInA

public boolean nestedBInA(Chunk a,
                          Chunk b)

getEndToEndDist

protected int getEndToEndDist(Chunk a,
                              Chunk b)

Gets the distance, in words, between the last word in a and the last word in b. The distance is the absolute value of the difference between the word locations.