LambdaRank (Learning to Rank 2.11 API)

java.lang.Object
- ciir.umass.edu.learning.Ranker
- - ciir.umass.edu.learning.neuralnet.RankNet
  - - ciir.umass.edu.learning.neuralnet.LambdaRank

```
public class LambdaRank
extends RankNet
```

Field Summary

Fields
Modifier and Type Field Description

protected float[][] targetValue
- Fields inherited from class ciir.umass.edu.learning.neuralnet.RankNet
  bestModelOnValidation, error, inputLayer, lastError, layers, learningRate, misorderedPairs, nHiddenLayer, nHiddenNodePerLayer, nIteration, outputLayer, straightLoss, totalPairs
- Fields inherited from class ciir.umass.edu.learning.Ranker
  bestScoreOnValidationData, features, samples, scoreOnTrainingData, scorer, validationSamples, verbose

Constructor Summary

Constructors
Constructor Description

LambdaRank()

LambdaRank(java.util.List<RankList> samples, int[] features, MetricScorer scorer)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected void`	`batchBackPropagate(int[][] pairMap, float[][] pairWeight)`
`protected int[][]`	`batchFeedForward(RankList rl)`
`protected float[][]`	`computePairWeight(int[][] pairMap, RankList rl)`
`Ranker`	`createNew()`
`protected void`	`estimateLoss()`
`protected RankList`	`internalReorder(RankList rl)`
`java.lang.String`	`name()`

Methods inherited from class ciir.umass.edu.learning.neuralnet.RankNet
addHiddenLayer, addInput, clearNeuronOutputs, connect, crossEntropy, eval, init, learn, loadFromString, model, printNetworkConfig, printParameters, printWeightVector, propagate, restoreBestModelOnValidation, saveBestModelOnValidation, setInputOutput, setInputOutput, toString, wire

Methods inherited from class ciir.umass.edu.learning.Ranker
copy, getFeatures, getScoreOnTrainingData, getScoreOnValidationData, PRINT, PRINT, PRINT_MEMORY_USAGE, PRINTLN, PRINTLN, PRINTTIME, rank, rank, save, setFeatures, setMetricScorer, setTrainingSet, setValidationSet

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

Field Detail
- targetValue
```
protected float[][] targetValue
```

Constructor Detail

LambdaRank
```
public LambdaRank()
```

LambdaRank

public LambdaRank(java.util.List<RankList> samples,
                  int[] features,
                  MetricScorer scorer)

Method Detail

batchFeedForward
```
protected int[][] batchFeedForward(RankList rl)
```
Overrides:

batchFeedForward in class RankNet

batchBackPropagate

protected void batchBackPropagate(int[][] pairMap,
                                  float[][] pairWeight)

Overrides:: batchBackPropagate in class RankNet

internalReorder

protected RankList internalReorder(RankList rl)

Overrides:: internalReorder in class RankNet

computePairWeight

protected float[][] computePairWeight(int[][] pairMap,
                                      RankList rl)

Overrides:: computePairWeight in class RankNet

estimateLoss
```
protected void estimateLoss()
```
Overrides:

estimateLoss in class RankNet

createNew
```
public Ranker createNew()
```
Overrides:

createNew in class RankNet

name
```
public java.lang.String name()
```
Overrides:

name in class RankNet