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Posted to issues@lucene.apache.org by "Elbek Kamoliddinov (Jira)" <ji...@apache.org> on 2019/12/19 17:59:00 UTC
[jira] [Updated] (LUCENE-9100) JapaneseTokenizer produces
inconsistent tokens
[ https://issues.apache.org/jira/browse/LUCENE-9100?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Elbek Kamoliddinov updated LUCENE-9100:
---------------------------------------
Description:
We use {{JapaneseTokenizer}} on prod and seeing some inconsistent behavior. With this text:
{{"マギアリス【単版話】 4話 (Unlimited Comics)"}} I get different results if I insert space before `【` char. Here is the small code snippet demonstrating the case (note we use our own dictionary and connection costs):
{code:java}
Analyzer analyzer = new Analyzer() {
@Override
protected TokenStreamComponents createComponents(String fieldName) {
// Tokenizer tokenizer = new JapaneseTokenizer(newAttributeFactory(), null, true, JapaneseTokenizer.Mode.SEARCH);
Tokenizer tokenizer = new JapaneseTokenizer(newAttributeFactory(), dictionaries.systemDictionary, dictionaries.unknownDictionary, dictionaries.connectionCosts, null, true, JapaneseTokenizer.Mode.SEARCH);
return new TokenStreamComponents(tokenizer, new LowerCaseFilter(tokenizer));
}
};
String text1 = "マギアリス【単版話】 4話 (Unlimited Comics)";
String text2 = "マギアリス 【単版話】 4話 (Unlimited Comics)"; //inserted space
try (TokenStream tokens = analyzer.tokenStream("field", new StringReader(text1))) {
CharTermAttribute chars = tokens.addAttribute(CharTermAttribute.class);
tokens.reset();
while (tokens.incrementToken()) {
System.out.println(chars.toString());
}
tokens.end();
} catch (IOException e) {
// should never happen with a StringReader
throw new RuntimeException(e);
} {code}
Output is:
{code:java}
//text1
マギ
アリス
単
版
話
4
話
unlimited
comics
//text2
マギア
リス
単
版
話
4
話
unlimited
comics{code}
It looks like tokenizer doesn't view the punctuation ({{【}} is {{Character.START_PUNCTUATION}} type) as an indicator that there should be a token break, and somehow 【 punctuation char causes difference in the output.
If I use the {{JapaneseTokenizer}} tokenizer then this problem doesn't manifest because it doesn't tokenize {{マギアリス}} into multiple tokens and outputs as is.
was:
We use {{JapaneseTokenizer}} on prod and seeing some inconsistent behavior. With this text:
{{"マギアリス【単版話】 4話 (Unlimited Comics)"}} I get different results if I insert space before `【` char. Here is the small code snippet demonstrating the case (not we use our own dictionary and connection costs):
{code:java}
Analyzer analyzer = new Analyzer() {
@Override
protected TokenStreamComponents createComponents(String fieldName) {
// Tokenizer tokenizer = new JapaneseTokenizer(newAttributeFactory(), null, true, JapaneseTokenizer.Mode.SEARCH);
Tokenizer tokenizer = new JapaneseTokenizer(newAttributeFactory(), dictionaries.systemDictionary, dictionaries.unknownDictionary, dictionaries.connectionCosts, null, true, JapaneseTokenizer.Mode.SEARCH);
return new TokenStreamComponents(tokenizer, new LowerCaseFilter(tokenizer));
}
};
String text1 = "マギアリス【単版話】 4話 (Unlimited Comics)";
String text2 = "マギアリス 【単版話】 4話 (Unlimited Comics)"; //inserted space
try (TokenStream tokens = analyzer.tokenStream("field", new StringReader(text1))) {
CharTermAttribute chars = tokens.addAttribute(CharTermAttribute.class);
tokens.reset();
while (tokens.incrementToken()) {
System.out.println(chars.toString());
}
tokens.end();
} catch (IOException e) {
// should never happen with a StringReader
throw new RuntimeException(e);
} {code}
Output is:
{code:java}
//text1
マギ
アリス
単
版
話
4
話
unlimited
comics
//text2
マギア
リス
単
版
話
4
話
unlimited
comics{code}
It looks like tokenizer doesn't view the punctuation (\{{【}} is \{{Character.START_PUNCTUATION}} type) as an indicator that there should be a token break, and somehow 【 punctuation char causes difference in the output.
If I use the {{JapaneseTokenizer}} tokenizer then this problem doesn't manifest because it doesn't tokenize {{マギアリス}} into multiple tokens and outputs as is.
> JapaneseTokenizer produces inconsistent tokens
> ----------------------------------------------
>
> Key: LUCENE-9100
> URL: https://issues.apache.org/jira/browse/LUCENE-9100
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/analysis
> Affects Versions: 7.2
> Reporter: Elbek Kamoliddinov
> Priority: Major
>
> We use {{JapaneseTokenizer}} on prod and seeing some inconsistent behavior. With this text:
> {{"マギアリス【単版話】 4話 (Unlimited Comics)"}} I get different results if I insert space before `【` char. Here is the small code snippet demonstrating the case (note we use our own dictionary and connection costs):
> {code:java}
> Analyzer analyzer = new Analyzer() {
> @Override
> protected TokenStreamComponents createComponents(String fieldName) {
> // Tokenizer tokenizer = new JapaneseTokenizer(newAttributeFactory(), null, true, JapaneseTokenizer.Mode.SEARCH);
> Tokenizer tokenizer = new JapaneseTokenizer(newAttributeFactory(), dictionaries.systemDictionary, dictionaries.unknownDictionary, dictionaries.connectionCosts, null, true, JapaneseTokenizer.Mode.SEARCH);
> return new TokenStreamComponents(tokenizer, new LowerCaseFilter(tokenizer));
> }
> };
> String text1 = "マギアリス【単版話】 4話 (Unlimited Comics)";
> String text2 = "マギアリス 【単版話】 4話 (Unlimited Comics)"; //inserted space
> try (TokenStream tokens = analyzer.tokenStream("field", new StringReader(text1))) {
> CharTermAttribute chars = tokens.addAttribute(CharTermAttribute.class);
> tokens.reset();
> while (tokens.incrementToken()) {
> System.out.println(chars.toString());
> }
> tokens.end();
> } catch (IOException e) {
> // should never happen with a StringReader
> throw new RuntimeException(e);
> } {code}
> Output is:
> {code:java}
> //text1
> マギ
> アリス
> 単
> 版
> 話
> 4
> 話
> unlimited
> comics
> //text2
> マギア
> リス
> 単
> 版
> 話
> 4
> 話
> unlimited
> comics{code}
> It looks like tokenizer doesn't view the punctuation ({{【}} is {{Character.START_PUNCTUATION}} type) as an indicator that there should be a token break, and somehow 【 punctuation char causes difference in the output.
> If I use the {{JapaneseTokenizer}} tokenizer then this problem doesn't manifest because it doesn't tokenize {{マギアリス}} into multiple tokens and outputs as is.
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