在Solr/Lucene中删除低于特定分数阈值的结果? [英] Remove results below a certain score threshold in Solr/Lucene?

问题描述

solr/lucene中是否有内置功能可以过滤结果(如果它们低于特定分数阈值)?假设我提供的得分阈值为.2，那么所有得分小于.2的文档都将从我的结果中删除.我的直觉是，可以通过更新/自定义solr或lucene来实现.

Is there a built-in functionalities in solr/lucene to filter the results if they fall below a certain score threshold? Let's say if I provide a score threshold of .2, then all documents with score less than .2 will be removed from my results. My intuition is that this is possible by updating/customizing solr or lucene.

您能指出正确的方向吗?

Could you point me to right direction on how to do this?

提前谢谢！

推荐答案

您可以编写自己的收集器，该收集器将忽略收集计分器放置在阈值以下的那些文档.下面是使用Lucene.Net 2.9.1.2和C#的一个简单示例.如果要保留计算出的分数，则需要修改示例.

You could write your own Collector that would ignore collecting those documents that the scorer places below your threshold. Below is a simple example of this using Lucene.Net 2.9.1.2 and C#. You'll need to modify the example if you want to keep the calculated score.

using System;
using System.Collections.Generic;
using Lucene.Net.Index;
using Lucene.Net.Search;

public class ScoreLimitingCollector : Collector {
    private readonly Single _lowerInclusiveScore;
    private readonly List<Int32> _docIds = new List<Int32>();
    private Scorer _scorer;
    private Int32 _docBase;

    public IEnumerable<Int32> DocumentIds {
        get { return _docIds; }
    }

    public ScoreLimitingCollector(Single lowerInclusiveScore) {
        _lowerInclusiveScore = lowerInclusiveScore;
    }

    public override void SetScorer(Scorer scorer) {
        _scorer = scorer;
    }

    public override void Collect(Int32 doc) {
        var score = _scorer.Score();
        if (_lowerInclusiveScore <= score)
            _docIds.Add(_docBase + doc);
    }

    public override void SetNextReader(IndexReader reader, Int32 docBase) {
        _docBase = docBase;
    }

    public override bool AcceptsDocsOutOfOrder() {
        return true;
    }
}

这篇关于在Solr/Lucene中删除低于特定分数阈值的结果?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！