ERRScorer (Learning to Rank 2.11 API)

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

public class ERRScorer
extends MetricScorer

Author:: Van Dang Expected Reciprocal Rank

Field Summary

Fields
Modifier and Type Field Description

static double MAX
- Fields inherited from class ciir.umass.edu.metric.MetricScorer
  k

Constructor Summary

Constructors
Constructor Description

ERRScorer()

ERRScorer(int k)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`ERRScorer`	`copy()`
`java.lang.String`	`name()`
`double`	`score(RankList rl)`	Compute ERR 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
  - MAX
```
public static double MAX
```
- Constructor Detail
  - ERRScorer
```
public ERRScorer()
```
  - ERRScorer
```
public ERRScorer(int k)
```
- Method Detail
  - copy
```
public ERRScorer copy()
```
    Specified by:
    
    copy in class MetricScorer
  - score
```
public double score(RankList rl)
```
    Compute ERR at k. NDCG(k) = DCG(k) / DCG_{perfect}(k). Note that the "perfect ranking" must be computed based on the whole list, not just top-k portion of the list.
    
    Specified by:
    
    score in class MetricScorer
  - name
```
public java.lang.String name()
```
    Specified by:
    
    name in class MetricScorer
  - swapChange
```
public double[][] swapChange(RankList rl)
```
    Specified by:
    
    swapChange in class MetricScorer