Lucene で tf-idf とコサインの類似性を実装するにはどうすればよいですか? Lucene 4.2 を使用しています。私が作成したプログラムは、tf-idf と Cosine の類似性を使用せず、TopScoreDocCollector のみを使用します。
import com.mysql.jdbc.Statement;
import java.io.BufferedReader;
import java.io.File;
import java.io.InputStreamReader;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.util.Version;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.IndexWriter;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.ResultSet;
import org.apache.lucene.analysis.id.IndonesianAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.*;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopScoreDocCollector;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.RAMDirectory;
public class IndexMysqlDBStemming {
public static void main(String[] args) throws Exception {
// 1. Create Index From Database
Class.forName("com.mysql.jdbc.Driver").newInstance();
Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/db_haiquran", "root", "");
IndonesianAnalyzer analyzer = new IndonesianAnalyzer(Version.LUCENE_42);
//StandardAnalyzer analyzer = new StandardAnalyzer(Version.LUCENE_42);
QueryParser parser = new QueryParser(Version.LUCENE_42, "result", analyzer);
Directory INDEX_DIR = new RAMDirectory();
IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_42, analyzer);
IndexWriter writer = new IndexWriter(INDEX_DIR, config);
String query = "SELECT * FROM ayat";
java.sql.Statement statement = connection.createStatement();
ResultSet result = statement.executeQuery(query);
while (result.next()) {
Document document = new Document();
document.add(new Field("NO_INDEX_AYAT", result.getString("NO_INDEX_AYAT"), Field.Store.YES, Field.Index.NOT_ANALYZED));
document.add(new Field("NO_SURAT", result.getString("NO_SURAT"), Field.Store.YES, Field.Index.NOT_ANALYZED));
document.add(new Field("NO_AYAT", result.getString("NO_AYAT"), Field.Store.YES, Field.Index.NOT_ANALYZED));
document.add(new Field("TEXT_INDO", result.getString("TEXT_INDO"), Field.Store.YES, Field.Index.ANALYZED));
document.add(new Field("TEXT_ARAB", result.getString("TEXT_ARAB"), Field.Store.YES, Field.Index.NOT_ANALYZED));
writer.updateDocument(new Term("NO_INDEX_AYAT", result.getString("NO_INDEX_AYAT")), document);
}
writer.close();
// 2. Query
System.out.println("Enter your search keyword in here : ");
BufferedReader bufferRead = new BufferedReader(new InputStreamReader(System.in));
String s = bufferRead.readLine();
String querystr = args.length > 0 ? args[0] :s;
try {
System.out.println(parser.parse(querystr)+"\n"); //amenit
System.out.println();
} catch (ParseException ex) {
// Exception
}
Query q = new QueryParser(Version.LUCENE_42, "TEXT_INDO", analyzer).parse(querystr);
// 3. Search
int hitsPerPage = 10;
IndexReader reader = DirectoryReader.open(INDEX_DIR);
IndexSearcher searcher = new IndexSearcher(reader);
TopScoreDocCollector collector = TopScoreDocCollector.create(hitsPerPage, true);
searcher.search(q, collector);
ScoreDoc[] hits = collector.topDocs().scoreDocs;
// 4. Display results
System.out.println("Found : " + hits.length + " hits.");
System.out.println("No" + " ID " + "\t" + " Surat " + "\t" + " No Ayat " + "\t" + " Terjemahan Ayat " + "\t" + " Teks Arab ");
for (int i=0; i<hits.length; i++) {
int docID = hits[i].doc;
Document d = searcher.doc(docID);
System.out.println((i+1) + ". " + d.get("NO_INDEX_AYAT") + "\t" + d.get("NO_SURAT") + "\t" + d.get("NO_AYAT")+
"\t" + d.get("TEXT_INDO") + "\t" + d.get("TEXT_ARAB"));
}
reader.close();
}
}
tf-idf と余弦類似度を使用して計算結果を表示するにはどうすればよいですか?