On Thursday 21 October 2004 23:03, Doug Cutting wrote:
> Idf's are already computed globally across all indexes. ÂTf's are local
> to the document. ÂIn short, scores from a MultiSearcher are the same as
> when searching an IndexReader with the same documents.
That doesn't seem to be the case in the attached test -- am I using
MultiSearcher in the wrong way or what might be the problem?
The output of the attached test is:
1+2 searched with Multisearcher:
two blah three score=0.70273256
one blah three score=0.35615897
one foo three score=0.35615897
one foobar three score=0.35615897
1+2 indexed together:
one blah three score=0.5911608
one foo three score=0.5911608
one foobar three score=0.5911608
two blah three score=0.5911608
--
http://www.danielnaber.de
import java.io.IOException;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.*;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;
/*
* Created on 21.10.2004
*/
/**
* @author dnaber
*/
public class RankingTest {
IndexWriter iw;
public static void main(String[] args) throws IOException {
new RankingTest();
}
private RankingTest() throws IOException {
multi();
together();
}
private void multi() throws IOException {
Directory d = new RAMDirectory();
iw = new IndexWriter(d, new StandardAnalyzer(), true);
addCollection1();
iw.close();
Directory d2 = new RAMDirectory();
iw = new IndexWriter(d2, new StandardAnalyzer(), true);
addCollection2();
iw.close();
System.out.println("1+2 searched with Multisearcher:");
Searchable[] s = new Searchable[2];
s[0] = new IndexSearcher(d);
s[1] = new IndexSearcher(d2);
//MultiSearcher ms = new ParallelMultiSearcher(s);
MultiSearcher ms = new MultiSearcher(s);
Query q = new TermQuery(new Term("body", "three"));
Hits h = ms.search(q);
for(int i = 0; i < h.length(); i++) {
Document doc = h.doc(i);
System.out.println(doc.get("body") + " score=" + h.score(i));
}
}
private void together() throws IOException {
System.out.println("\n1+2 indexed together:");
Directory d = new RAMDirectory();
iw = new IndexWriter(d, new StandardAnalyzer(), true);
addCollection1();
addCollection2();
iw.close();
search("three", d);
}
private void search(String string, Directory d) throws IOException {
IndexSearcher is = new IndexSearcher(d);
Query q = new TermQuery(new Term("body", string));
Hits h = is.search(q);
for(int i = 0; i < h.length(); i++) {
Document doc = h.doc(i);
System.out.println(doc.get("body") + " score=" + h.score(i));
}
is.close();
}
private void addCollection1() throws IOException {
add("one blah three");
add("one foo three");
add("one foobar three");
}
private void addCollection2() throws IOException {
add("two blah three");
add("two foo xxx");
add("two foobar xxx");
}
private void add(String string) throws IOException {
Document d = new Document();
d.add(new Field("body", string, Field.Store.YES, Field.Index.TOKENIZED));
iw.addDocument(d);
}
}
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