First of all, I really appreciate your work on Lucene for Korean words,
But If we cannot support stem analyzer for Korean words, I think one
token for one Korean character is better.
When we search a word, usually we use "검색" not "검색하다". ("하다" is like
"ed" of "searched").
If we cannot get any result from "검색", StandardAnalyzer has no meaning
to Korean, I may have to go back to use CJKAnalyzer.
How about let the StandarAnalyzer be not changed, and add a new
Analyzer for Korea words?
Thanks.
2005/11/8, Cheolgoo Kang <[EMAIL PROTECTED]>:
> On 11/8/05, Youngho Cho <[EMAIL PROTECTED]> wrote:
> > Hello,
> >
> > just simple test ...
> > If I compile the javacc correctly..
> > the patched version doesn't match some situation
> > for example
> > in text
> > '엔진박지성(맨체스터 유나이티드)이 주말 프리미어리그를 위해 벤치를 지키며 재충전의 시간을 가졌다.'
> > if query word is '시간' than nothing match
> > but if query word is '시간을' than good match.
>
> That's exactly what I've wanted to do with this patch. You need more
> sophisticated morphological analyzer to to what you've wanted to.
> AFAIK, I'm afraid there is no open sourced software to do the Korean
> morphological analysis.
>
> And also, if you have Lucene in Action Korean translation, there is a
> simple introduction to Korean stemming analysis at Appendix D. That's
> just simple enough to hold a list of Korean word endings, and check
> for each Token with matching word endings. :)
>
> >
> > I think there is some tradeoff here.
> >
> > Maybe need some good stop filter for korean etc.......
> >
> >
> > Thanks
> >
> > Youngho
> >
> > ----- Original Message -----
> > From: "Youngho Cho" <[EMAIL PROTECTED]>
> > To: <java-user@lucene.apache.org>
> > Sent: Tuesday, November 08, 2005 4:44 PM
> > Subject: Re: korean and lucene
> >
> >
> > > Hello Cheolgoo,
> > >
> > > I will test the patch.
> > >
> > >
> > > Thanks,
> > >
> > > Youngho
> > >
> > > ----- Original Message -----
> > > From: "Cheolgoo Kang" <[EMAIL PROTECTED]>
> > > To: <java-user@lucene.apache.org>; "Youngho Cho" <[EMAIL PROTECTED]>
> > > Sent: Tuesday, November 08, 2005 4:06 PM
> > > Subject: Re: korean and lucene
> > >
> > >
> > > > Hello,
> > > >
> > > > I've created a new JIRA issue with Korean analysis that
> > > > StandardAnalyzer splits one word into several tokens each with one
> > > > character. Cause Korean is not a phonogram, one character in Korean
> > > > has almost no meaning at all. So word in Korean should be preserved
> > > > not like Chinese or Japanese.
> > > >
> > > > I've attached a patch to StandardTokenizer to do this and passed the
> > > > test case TestStandardAnalyzer(also patched to test Korean words).
> > > >
> > > > Thanks!
> > > >
> > > > On 10/27/05, Youngho Cho <[EMAIL PROTECTED]> wrote:
> > > > > Hello,
> > > > >
> > > > > Ok , I've attached my test code for Korean which is slitely modified
> > > > > Koji's code.
> > > > >
> > > > > Just put into the lia.analysis.i18n package at LuceneInAction
> > > > > and run ant.
> > > > >
> > > > > Hopely someone is helped.
> > > > >
> > > > > -------- build.xml ---------
> > > > >
> > > > > <target name="JapaneseDemo" depends="prepare"
> > > > > description="Examples of Jananese analysis">
> > > > > <info>
> > > > >
> > > > > Japanese Test...
> > > > >
> > > > > </info>
> > > > >
> > > > > <run-main class="lia.analysis.i18n.JapaneseDemo"/>
> > > > > </target>
> > > > >
> > > > > <target name="KoreanDemo" depends="prepare"
> > > > > description="Examples of Korean analysis">
> > > > > <info>
> > > > >
> > > > > Korean Test...
> > > > >
> > > > > </info>
> > > > >
> > > > > <run-main class="lia.analysis.i18n.KoreanDemo"/>
> > > > > </target>
> > > > >
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Youngho
> > > > >
> > > > >
> > > > > ----- Original Message -----
> > > > > From: "Youngho Cho" <[EMAIL PROTECTED]>
> > > > > To: <java-user@lucene.apache.org>; "Youngho Cho" <[EMAIL PROTECTED]>
> > > > > Sent: Thursday, October 27, 2005 12:47 PM
> > > > > Subject: Re: korean and lucene
> > > > >
> > > > >
> > > > > > Hello all
> > > > > > Plese forgive me pervious my stupid message
> > > > > >
> > > > > > [echo] Running lia.analysis.i18n.KoreanDemo...
> > > > > > [java] [경] [기] analyzer =
> > > > > > org.apache.lucene.analysis.standard.StandardAnalyzer
> > > > > > [java] phrase = 경기
> > > > > > [java] query = "경 기"
> > > > > >
> > > > > > I got the good result.
> > > > > >
> > > > > > When I compile I just rename old version lucene-1.4.3.jar to
> > > > > > lucene-1.4.3.jar_bak
> > > > > > and all new 1.9 lucene. and build the test package.
> > > > > > After I remove lucene-1.4.3.jar_bak in lib directory completely
> > > > > > I got the expected result !!!.
> > > > > >
> > > > > > I don't know the reason... ( looks like my finger make some
> > > > > > trouble... )
> > > > > >
> > > > > > Anyway thanks Koji and Cheolgoo
> > > > > > I will further test now...
> > > > > >
> > > > > > Youngho
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > ----- Original Message -----
> > > > > > From: "Youngho Cho" <[EMAIL PROTECTED]>
> > > > > > To: <java-user@lucene.apache.org>
> > > > > > Sent: Thursday, October 27, 2005 12:28 PM
> > > > > > Subject: Re: korean and lucene
> > > > > >
> > > > > >
> > > > > > > Hello Koji
> > > > > > >
> > > > > > > Here is test result.
> > > > > > > Japanese is OK !.
> > > > > > > maybe ant clean did some effect.
> > > > > > >
> > > > > > > Anyway please refer to the result using 1.9
> > > > > > >
> > > > > > > [echo] Running lia.analysis.i18n.JapaneseDemo...
> > > > > > > [java] [ラ] [メ] [ン] [屋] analyzer =
> > > > > > > org.apache.lucene.analysis.standard.StandardAnalyzer
> > > > > > > [java] phrase = ラ?メン屋
> > > > > > > [java] query = content:ラ?メン屋
> > > > > > >
> > > > > > > [echo] Running lia.analysis.i18n.KoreanDemo...
> > > > > > > [java] analyzer =
> > > > > > > org.apache.lucene.analysis.standard.StandardAnalyzer
> > > > > > > [java] phrase = 경
> > > > > > > [java] query =
> > > > > > >
> > > > > > > [echo] Running lia.analysis.i18n.JapaneseDemo...
> > > > > > > [java] [ラ] [メン] [ン屋] analyzer =
> > > > > > > org.apache.lucene.analysis.cjk.CJKAnalyzer
> > > > > > > [java] phrase = ラ?メン屋
> > > > > > > [java] query = content:ラ?メン屋
> > > > > > >
> > > > > > > [echo] Running lia.analysis.i18n.KoreanDemo...
> > > > > > > [java] [경] analyzer =
> > > > > > > org.apache.lucene.analysis.cjk.CJKAnalyzer
> > > > > > > [java] phrase = 경
> > > > > > > [java] query = 경
> > > > > > >
> > > > > > > [echo] Running lia.analysis.i18n.KoreanDemo...
> > > > > > > [java] analyzer =
> > > > > > > org.apache.lucene.analysis.standard.StandardAnalyzer
> > > > > > > [java] phrase = 경기
> > > > > > > [java] query =
> > > > > > >
> > > > > > > [echo] Running lia.analysis.i18n.KoreanDemo...
> > > > > > > [java] [경기] analyzer =
> > > > > > > org.apache.lucene.analysis.cjk.CJKAnalyzer
> > > > > > > [java] phrase = 경기
> > > > > > > [java] query = 경기
> > > > > > >
> > > > > > >
> > > > > > > Standard analyzer didn't tokenized the Korean Character at all....
> > > > > > >
> > > > > > > Ug.... look like
> > > > > > > http://issues.apache.org/jira/browse/LUCENE-444
> > > > > > > didn't effect at all for Korean.
> > > > > > >
> > > > > > >
> > > > > > > Thanks
> > > > > > >
> > > > > > > Youngho
> > > > > > >
> > > > > > > ----- Original Message -----
> > > > > > > From: "Koji Sekiguchi" <[EMAIL PROTECTED]>
> > > > > > > To: <java-user@lucene.apache.org>; "Youngho Cho" <[EMAIL
> > > > > > > PROTECTED]>
> > > > > > > Sent: Thursday, October 27, 2005 11:47 AM
> > > > > > > Subject: RE: korean and lucene
> > > > > > >
> > > > > > >
> > > > > > > > Hello Youngho,
> > > > > > > >
> > > > > > > > I don't understand why you couldn't get hits result in Japanese,
> > > > > > > > though, you had better check why the query was empty with
> > > > > > > > Korean data:
> > > > > > > >
> > > > > > > > > For Korean
> > > > > > > > > [echo] Running lia.analysis.i18n.KoreanDemo...
> > > > > > > > > [java] phrase = 경
> > > > > > > > > [java] query =
> > > > > > > >
> > > > > > > > The last line should be query = 경
> > > > > > > > to get hits result. Can you check why StandardAnalyzer
> > > > > > > > removes "경" during tokenizing?
> > > > > > > >
> > > > > > > > Koji
> > > > > > > >
> > > > > > > > > -----Original Message-----
> > > > > > > > > From: Youngho Cho [mailto:[EMAIL PROTECTED]
> > > > > > > > > Sent: Thursday, October 27, 2005 11:37 AM
> > > > > > > > > To: java-user@lucene.apache.org
> > > > > > > > > Subject: Re: korean and lucene
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > Hello Koji,
> > > > > > > > >
> > > > > > > > > Thanks for your kind reply.
> > > > > > > > >
> > > > > > > > > Yes, I used QueryParser. normaly I used
> > > > > > > > > Query = QueryParser.parse( ) method.
> > > > > > > > >
> > > > > > > > > I put your sample code into lia.analysis.i18n package in
> > > > > > > > > LuceneAction
> > > > > > > > > and run JapaneseDemo using 1.4 and 1.9
> > > > > > > > >
> > > > > > > > > results are
> > > > > > > > >
> > > > > > > > > [echo] Running lia.analysis.i18n.JapaneseDemo...
> > > > > > > > > [java] query = content:ラ?メン屋
> > > > > > > > >
> > > > > > > > > I can't get hits result.
> > > > > > > > >
> > > > > > > > > For Korean
> > > > > > > > > [echo] Running lia.analysis.i18n.KoreanDemo...
> > > > > > > > > [java] phrase = 경
> > > > > > > > > [java] query =
> > > > > > > > >
> > > > > > > > > I can't get query parse result.
> > > > > > > > >
> > > > > > > > > Thanks,
> > > > > > > > >
> > > > > > > > > Youngho
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > ----- Original Message -----
> > > > > > > > > From: "Koji Sekiguchi" <[EMAIL PROTECTED]>
> > > > > > > > > To: <java-user@lucene.apache.org>; "Youngho Cho" <[EMAIL
> > > > > > > > > PROTECTED]>
> > > > > > > > > Sent: Thursday, October 27, 2005 9:48 AM
> > > > > > > > > Subject: RE: korean and lucene
> > > > > > > > >
> > > > > > > > >
> > > > > > > > > > Hi Youngho,
> > > > > > > > > >
> > > > > > > > > > With regard to Japanese, using StandardAnalyzer,
> > > > > > > > > > I can search a word/phase.
> > > > > > > > > >
> > > > > > > > > > Did you use QueryParser? StandardAnalyzer tokenizes
> > > > > > > > > > CJK characters into a stream of single character.
> > > > > > > > > > Use QueryParser to get a PhraseQuery and search the query.
> > > > > > > > > >
> > > > > > > > > > Please see the following sample code. Replace Japanese
> > > > > > > > > > "contents" and (search target) "phrase" with Korean in the
> > > > > > > > > program and run.
> > > > > > > > > >
> > > > > > > > > > regards,
> > > > > > > > > >
> > > > > > > > > > Koji
> > > > > > > > > >
> > > > > > > > > > =============================================
> > > > > > > > > > import java.io.IOException;
> > > > > > > > > > import org.apache.lucene.analysis.Analyzer;
> > > > > > > > > > import org.apache.lucene.analysis.standard.StandardAnalyzer;
> > > > > > > > > > import org.apache.lucene.analysis.cjk.CJKAnalyzer;
> > > > > > > > > > import org.apache.lucene.store.Directory;
> > > > > > > > > > import org.apache.lucene.store.RAMDirectory;
> > > > > > > > > > import org.apache.lucene.index.IndexWriter;
> > > > > > > > > > import org.apache.lucene.document.Document;
> > > > > > > > > > import org.apache.lucene.document.Field;
> > > > > > > > > > import org.apache.lucene.search.IndexSearcher;
> > > > > > > > > > import org.apache.lucene.search.Hits;
> > > > > > > > > > import org.apache.lucene.search.Query;
> > > > > > > > > > import org.apache.lucene.queryParser.QueryParser;
> > > > > > > > > > import org.apache.lucene.queryParser.ParseException;
> > > > > > > > > >
> > > > > > > > > > public class JapaneseByStandardAnalyzer {
> > > > > > > > > >
> > > > > > > > > > private static final String FIELD_CONTENT = "content";
> > > > > > > > > > private static final String[] contents = {
> > > > > > > > > > "東京にはおいしいラーメン屋がたくさんあります。",
> > > > > > > > > > "北海道にもおいしいラーメン屋があります。"
> > > > > > > > > > };
> > > > > > > > > > private static final String phrase = "ラーメン屋";
> > > > > > > > > > //private static final String phrase = "屋";
> > > > > > > > > > private static Analyzer analyzer = null;
> > > > > > > > > >
> > > > > > > > > > public static void main( String[] args ) throws
> > > > > > > > > IOException, ParseException {
> > > > > > > > > > Directory directory = makeIndex();
> > > > > > > > > > search( directory );
> > > > > > > > > > directory.close();
> > > > > > > > > > }
> > > > > > > > > >
> > > > > > > > > > private static Analyzer getAnalyzer(){
> > > > > > > > > > if( analyzer == null ){
> > > > > > > > > > analyzer = new StandardAnalyzer();
> > > > > > > > > > //analyzer = new CJKAnalyzer();
> > > > > > > > > > }
> > > > > > > > > > return analyzer;
> > > > > > > > > > }
> > > > > > > > > >
> > > > > > > > > > private static Directory makeIndex() throws IOException
> > > > > > > > > > {
> > > > > > > > > > Directory directory = new RAMDirectory();
> > > > > > > > > > IndexWriter writer = new IndexWriter( directory,
> > > > > > > > > > getAnalyzer(), true );
> > > > > > > > > > for( int i = 0; i < contents.length; i++ ){
> > > > > > > > > > Document doc = new Document();
> > > > > > > > > > doc.add( new Field( FIELD_CONTENT, contents[i],
> > > > > > > > > Field.Store.YES, Field.Index.TOKENIZED ) );
> > > > > > > > > > writer.addDocument( doc );
> > > > > > > > > > }
> > > > > > > > > > writer.close();
> > > > > > > > > > return directory;
> > > > > > > > > > }
> > > > > > > > > >
> > > > > > > > > > private static void search( Directory directory ) throws
> > > > > > > > > IOException, ParseException {
> > > > > > > > > > IndexSearcher searcher = new IndexSearcher( directory );
> > > > > > > > > > QueryParser parser = new QueryParser( FIELD_CONTENT,
> > > > > > > > > > getAnalyzer() );
> > > > > > > > > > Query query = parser.parse( phrase );
> > > > > > > > > > System.out.println( "query = " + query );
> > > > > > > > > > Hits hits = searcher.search( query );
> > > > > > > > > > for( int i = 0; i < hits.length(); i++ )
> > > > > > > > > > System.out.println( "doc = " + hits.doc( i ).get(
> > > > > > > > > > FIELD_CONTENT ) );
> > > > > > > > > > searcher.close();
> > > > > > > > > > }
> > > > > > > > > > }
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > > -----Original Message-----
> > > > > > > > > > > From: Youngho Cho [mailto:[EMAIL PROTECTED]
> > > > > > > > > > > Sent: Thursday, October 27, 2005 8:18 AM
> > > > > > > > > > > To: java-user@lucene.apache.org; Cheolgoo Kang
> > > > > > > > > > > Subject: Re: korean and lucene
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > Hello Cheolgoo,
> > > > > > > > > > >
> > > > > > > > > > > Now I updated my lucene version to 1.9 for using
> > > > > > > > > > > StandardAnalyzer
> > > > > > > > > > > for Korean.
> > > > > > > > > > > And tested your patch which is already adopted in 1.9
> > > > > > > > > > >
> > > > > > > > > > > http://issues.apache.org/jira/browse/LUCENE-444
> > > > > > > > > > >
> > > > > > > > > > > But Still I have no good results with Korean compare with
> > > > > > > > > CJKAnalyzer.
> > > > > > > > > > >
> > > > > > > > > > > Single character is good match but more two character word
> > > > > > > > > > > doesn't match at all.
> > > > > > > > > > >
> > > > > > > > > > > Am I something missing or still there need some more
> > > > > > > > > > > works ?
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > Thanks,
> > > > > > > > > > >
> > > > > > > > > > > Youngho.
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > ----- Original Message -----
> > > > > > > > > > > From: "Cheolgoo Kang" <[EMAIL PROTECTED]>
> > > > > > > > > > > To: <java-user@lucene.apache.org>; "John Wang" <[EMAIL
> > > > > > > > > > > PROTECTED]>
> > > > > > > > > > > Sent: Tuesday, October 04, 2005 10:11 AM
> > > > > > > > > > > Subject: Re: korean and lucene
> > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > > StandardAnalyzer's JavaCC based StandardTokenizer.jj
> > > > > > > > > > > > cannot read
> > > > > > > > > > > > Korean part of Unicode character blocks.
> > > > > > > > > > > >
> > > > > > > > > > > > You should 1) use CJKAnalyzer or 2) add Korean character
> > > > > > > > > > > > block(0xAC00~0xD7AF) to the CJK token definition on the
> > > > > > > > > > > > StandardTokenizer.jj file.
> > > > > > > > > > > >
> > > > > > > > > > > > Hope it helps.
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > On 10/4/05, John Wang <[EMAIL PROTECTED]> wrote:
> > > > > > > > > > > > > Hi:
> > > > > > > > > > > > >
> > > > > > > > > > > > > We are running into problems with searching on korean
> > > > > > > > > > > documents. We are
> > > > > > > > > > > > > using the StandardAnalyzer and everything works with
> > > > > > > > > > > > > Chinese
> > > > > > > > > > > and Japanese.
> > > > > > > > > > > > > Are there known problems with Korean with Lucene?
> > > > > > > > > > > > >
> > > > > > > > > > > > > Thanks
> > > > > > > > > > > > >
> > > > > > > > > > > > > -John
> > > > > > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > > > > --
> > > > > > > > > > > > Cheolgoo
> > > > > > > > > > > >
> > > > > > > > > > > >
> > > > > > > > > ---------------------------------------------------------------------
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> > > > > > > > > >
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> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > Cheolgoo
>
>
> --
> Cheolgoo
>
