ciir.umass.edu.metric.PrecisionScorer Maven / Gradle / Ivy
/*===============================================================================
* Copyright (c) 2010-2012 University of Massachusetts. All Rights Reserved.
*
* Use of the RankLib package is subject to the terms of the software license set
* forth in the LICENSE file included with this software, and also available at
* http://people.cs.umass.edu/~vdang/ranklib_license.html
*===============================================================================
*/
package ciir.umass.edu.metric;
import java.util.Arrays;
import ciir.umass.edu.learning.RankList;
/**
* @author vdang
*/
public class PrecisionScorer extends MetricScorer {
public PrecisionScorer()
{
this.k = 10;
}
public PrecisionScorer(int k)
{
this.k = k;
}
public double score(RankList rl)
{
int count = 0;
int size = k;
if(k > rl.size() || k <= 0)
size = rl.size();
for(int i=0;i 0.0)//relevant
count++;
}
return ((double)count)/size;
}
public MetricScorer copy()
{
return new PrecisionScorer();
}
public String name()
{
return "P@"+k;
}
public double[][] swapChange(RankList rl)
{
int size = (rl.size() > k) ? k : rl.size();
/*int relCount = 0;
for(int i=0;i 0.0)//relevant
relCount++;*/
double[][] changes = new double[rl.size()][];
for(int i=0;i 0.0)
return 1;
return 0;
}
}