Package org.apache.solr.ltr

Class FeatureLogger

java.lang.Object

org.apache.solr.ltr.FeatureLogger

Direct Known Subclasses:

CSVFeatureLogger

public abstract class FeatureLogger
extends Object

FeatureLogger can be registered in a model and provide a strategy for logging the feature values.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	FeatureLogger.FeatureFormat

Field Summary

Fields

Modifier and Type	Field	Description
protected FeatureLogger.FeatureFormat	featureFormat

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FeatureLogger(String fvCacheName, FeatureLogger.FeatureFormat f)

Method Summary

Modifier and Type	Method	Description
String	getFeatureVector(int docid, LTRScoringQuery scoringQuery, SolrIndexSearcher searcher)	populate the document with its feature vector
boolean	log(int docid, LTRScoringQuery scoringQuery, SolrIndexSearcher searcher, LTRScoringQuery.FeatureInfo[] featuresInfo)	Log will be called every time that the model generates the feature values for a document and a query.
abstract String	makeFeatureVector(LTRScoringQuery.FeatureInfo[] featuresInfo)

Methods inherited from class java.lang.Object

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

Field Detail

featureFormat

protected final FeatureLogger.FeatureFormat featureFormat

Constructor Detail

FeatureLogger

protected FeatureLogger(String fvCacheName,
                        FeatureLogger.FeatureFormat f)

Method Detail

log

public boolean log(int docid,
                   LTRScoringQuery scoringQuery,
                   SolrIndexSearcher searcher,
                   LTRScoringQuery.FeatureInfo[] featuresInfo)

Log will be called every time that the model generates the feature values for a document and a query.

Parameters:

docid - Solr document id whose features we are saving

featuresInfo - List of all the LTRScoringQuery.FeatureInfo objects which contain name and value for all the features triggered by the result set

Returns:

true if the logger successfully logged the features, false otherwise.

makeFeatureVector

public abstract String makeFeatureVector(LTRScoringQuery.FeatureInfo[] featuresInfo)

getFeatureVector

public String getFeatureVector(int docid,
                               LTRScoringQuery scoringQuery,
                               SolrIndexSearcher searcher)

populate the document with its feature vector

Parameters:

docid - Solr document id

Returns:

String representation of the list of features calculated for docid