java - Lucene评分函数

Question

我正在开发一个在索引中索引和搜索推文的系统，每条推文都有一个定义其社交重要性(社交值(value))的字段，我想将此值添加到相似性分数中，以便我可以通过结合文档的社交值(value)和查询分数来对文档进行排名。

例如，我的评分函数如下

Final Score = QueryScore + Social score ( which is a float that I already calculated)

那么我怎样才能实现这个目标呢？

我使用的是lucene-5.5.0

package Lucene;


import java.nio.file.Path;
import java.nio.file.Paths;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;

public class SearchFiles {

    @SuppressWarnings("deprecation")
    public static void main(String[] args){
        try{

            Path path = Paths.get("C:\\Users\\JUGURTHA\\Desktop\\boulot\\index");
            Directory dir = FSDirectory.open(path);
            DirectoryReader ireader = DirectoryReader.open(dir);
            IndexSearcher isearcher = new IndexSearcher(ireader);
            StandardAnalyzer analyzer = new StandardAnalyzer();
            //get each token            
            QueryParser parser = new QueryParser("text", analyzer);
            Query query = parser.parse("Love");
            ScoreDoc[] hits = isearcher.search(query, null, 20).scoreDocs;
            for (int i = 0; i <  hits.length; i++){
                Document hitDoc = isearcher.doc(hits[i].doc);
                System.out.println("Tweet " + i + " : " + hitDoc.get("text"));
                System.out.println("created_at: " + hitDoc.get("date"));
                System.out.println("id: " + hitDoc.get("id"));
                System.out.println();
                System.out.println();

            }


        } catch(Exception e){
            e.printStackTrace();
        }
    }
}

Answer 1

我弄清楚了如何完成工作，我使用了 CustomScoreProvider 类，并得到了我想要的结果

class CustomizedScoreProvider extends CustomScoreProvider {

    public CustomizedScoreProvider(LeafReaderContext reader) {
            super(reader);
            // TODO Auto-generated constructor stub
        }

    public  float customScore(int doc, float subQueryScore,float valSrcScores[]){

     try {

         subQueryScore+=4; // I only added this for testing , 
     } catch(Exception e) { 
         e.printStackTrace();
            }
    return subQueryScore;
             }
    }

class CustomizedScoreQuery extends CustomScoreQuery{


public CustomizedScoreQuery(Query subQuery,IndexReader ireader) {
        super(subQuery);
        // TODO Auto-generated constructor stub
    }
public CustomizedScoreProvider getCustomScoreProvider (LeafReaderContext reader){
    CustomizedScoreProvider i=new CustomizedScoreProvider(reader);
     return (i);
}
}