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

问题描述

solr/lucene 是否有内置功能来过滤低于某个分数阈值的结果?假设我提供的分数阈值为 0.2，那么所有分数小于 0.2 的文档都将从我的结果中删除.我的直觉是，这可以通过更新/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.

你能指点我正确的方向吗?

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

提前致谢！

推荐答案

您可以编写自己的收集器，该收集器将忽略收集评分员置于阈值以下的那些文档.下面是一个使用 Lucene.Net 2.9.1.2 和 C# 的简单示例.如果您想保留计算出的分数，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;
    }
}

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