程序包 dev.langchain4j.rag.content.aggregator

类 ReRankingContentAggregator

java.lang.Object

dev.langchain4j.rag.content.aggregator.ReRankingContentAggregator

所有已实现的接口:

ContentAggregator

public class ReRankingContentAggregator
extends Object
implements ContentAggregator

A ContentAggregator that performs re-ranking using a ScoringModel, such as Cohere.
The ScoringModel scores Contents against a (single) Query. If multiple Querys are input to this aggregator (for example, when using ExpandingQueryTransformer), a querySelector must be provided to select a Query for ranking all Contents. Alternatively, a custom implementation can be created to score Contents against the Querys that were used for their retrieval (instead of a single Query), and then re-rank based on those scores. Although potentially more costly, this method may yield better results when the Querys are significantly different.

Before the use of a ScoringModel, all Contents are fused in the same way as by the DefaultContentAggregator. For detailed information, please refer to its Javadoc.

Configurable parameters (optional):
- minScore: the minimum score for Contents to be returned. Contents scoring below this threshold (as determined by the ScoringModel) are excluded from the results.

另请参阅:

• DefaultContentAggregator

字段概要

字段

修饰符和类型	字段	说明
static final Function<Map<Query,Collection<List<Content>>>,Query>	DEFAULT_QUERY_SELECTOR

构造器概要

构造器

构造器	说明
ReRankingContentAggregator(ScoringModel scoringModel)
ReRankingContentAggregator(ScoringModel scoringModel, Function<Map<Query,Collection<List<Content>>>,Query> querySelector, Double minScore)

方法概要

修饰符和类型	方法	说明
List<Content>	aggregate(Map<Query,Collection<List<Content>>> queryToContents)	Aggregates all Contents retrieved by all ContentRetrievers using all Querys.
protected Map<Query,List<Content>>	fuse(Map<Query,Collection<List<Content>>> queryToContents)
protected List<Content>	reRankAndFilter(List<Content> contents, Query query)

从类继承的方法 java.lang.Object

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

字段详细资料

DEFAULT_QUERY_SELECTOR

public static final Function<Map<Query,Collection<List<Content>>>,Query> DEFAULT_QUERY_SELECTOR

构造器详细资料

ReRankingContentAggregator

public ReRankingContentAggregator(ScoringModel scoringModel)

ReRankingContentAggregator

public ReRankingContentAggregator(ScoringModel scoringModel,
 Function<Map<Query,Collection<List<Content>>>,Query> querySelector,
 Double minScore)

方法详细资料

aggregate

public List<Content> aggregate(Map<Query,Collection<List<Content>>> queryToContents)

从接口复制的说明: ContentAggregator

Aggregates all Contents retrieved by all ContentRetrievers using all Querys. The Contents, both on input and output, are sorted by relevance, with the most relevant Contents appearing at the beginning of List<Content>.

指定者:

aggregate 在接口中 ContentAggregator

参数:

queryToContents - A map from a Query to all List<Content> retrieved with that Query. Given that each Query can be routed to multiple ContentRetrievers, the value of this map is a Collection<List<Content>> rather than a simple List<Content>.

返回:

A list of aggregated Contents.

fuse

protected Map<Query,List<Content>> fuse(Map<Query,Collection<List<Content>>> queryToContents)

reRankAndFilter

protected List<Content> reRankAndFilter(List<Content> contents,
 Query query)