DCGScorer (Learning to Rank 2.11 API)

java.lang.Object
- ciir.umass.edu.metric.MetricScorer
- - ciir.umass.edu.metric.DCGScorer

Direct Known Subclasses:: NDCGScorer

public class DCGScorer
extends MetricScorer

Field Summary

Fields
Modifier and Type Field Description

protected static double[] discount

protected static double[] gain
- Fields inherited from class ciir.umass.edu.metric.MetricScorer
  k

Constructor Summary

Constructors
Constructor Description

DCGScorer()

DCGScorer(int k)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`MetricScorer`	`copy()`
`protected double`	`discount(int index)`
`protected double`	`gain(int rel)`
`protected double`	`getDCG(int[] rel, int topK)`
`java.lang.String`	`name()`
`double`	`score(RankList rl)`	Compute DCG at k.
`double[][]`	`swapChange(RankList rl)`

Methods inherited from class ciir.umass.edu.metric.MetricScorer
getK, getRelevanceLabels, loadExternalRelevanceJudgment, score, setK

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

discount
```
protected static double[] discount
```

gain
```
protected static double[] gain
```

Constructor Detail

DCGScorer
```
public DCGScorer()
```

DCGScorer
```
public DCGScorer(int k)
```

Method Detail

copy
```
public MetricScorer copy()
```
Specified by:

copy in class MetricScorer

score
```
public double score(RankList rl)
```
Compute DCG at k.

Specified by:

score in class MetricScorer

swapChange
```
public double[][] swapChange(RankList rl)
```
Specified by:

swapChange in class MetricScorer

name
```
public java.lang.String name()
```
Specified by:

name in class MetricScorer

getDCG

protected double getDCG(int[] rel,
                        int topK)

discount

protected double discount(int index)

gain
```
protected double gain(int rel)
```