hi,
thanks for the reply.see: http://lucene.apache.org/java/2_4_1/api/index.html
you will find there the Similarity have created and run to get the similarity
between the two Strings.I did the folow:
I created a doc:
doc.add(new Field("term","this expression of galectin-1 in blood vessel walls
was correlated with vascular", Field.Store.YES,Field.Index.TOKENIZED));
then I indexed it and i ran the followed Similarity query to get the cosine
similarity :
query=SimilarityQueries.formSimilarQuery("this expression of galectin-1 in
blood vessel walls was correlated with vascular",analyzer,"term",null);
ScoreDoc[] scoreDocs = searcher.search(query,5).scoreDocs;
I got the score mentioned above.(0.3044460713863373)
thanks.
kamal
Original Message:
What is SimilarityQueries? I'd try the explain capabilities to see
<br />more.
<br />
<br />
<br />On May 5, 2009, at 2:23 PM, Kamal Najib wrote:
<br />
<br />> hi all,
<br />> i got the similarity score 0.3044460713863373 between two docs which
<br />> have the same text content, is it correct? I expected 1.0, hier is
<br />> my result line:
<br />>
<br />> doc:"this expression of galectin-1 in blood vessel walls was
<br />> correlated with vascular"
<br />> doc2 :"this expression of galectin-1 in blood vessel walls was
<br />> correlated with vascular" Score :"0.3044460713863373"
<br />> is the score correct?
<br />> my methode is :
<br />> public double getSimilarity(String v1,String v2) throws Exception
<br />> {
<br />>
<br />> float result=0;
<br />> directory = new RAMDirectory();
<br />> Analyzer analyzer = new StandardAnalyzer();
<br />> IndexWriter writer = new IndexWriter(directory, analyzer,
<br />> true, IndexWriter.MaxFieldLength.LIMITED);
<br />>
<br />>
<br />> Document doc1 = new Document();
<br />> doc1.add(new Field("term",v1, Field.Store.YES,
<br />> Field.Index.TOKENIZED));
<br />> writer.addDocument(doc1);
<br />> writer.close();
<br />> IndexReader ir=IndexReader.open(directory);
<br />> IndexSearcher searcher = new IndexSearcher(directory);
<br />> Query
<br />> query=SimilarityQueries.formSimilarQuery(v2,analyzer,"term",null);
<br />> ScoreDoc[] scoreDocs = searcher.search(query,5).scoreDocs;
<br />> int docNum = scoreDocs[0].doc;
<br />> result = scoreDocs[0].score;
<br />> Document hitDoc = searcher.doc(docNum);
<br />> System.out.println("Term 1 :"+v2+"
Term2:"+hitDoc.get("term")+"
<br />> Score :"+result);
<br />> return result;
<br />> }
<br />> please help.
<br />> thanks in advance.
<br />> Kamal
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