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Posted to issues@lucene.apache.org by "Tomoko Uchida (Jira)" <ji...@apache.org> on 2021/03/21 09:56:00 UTC
[jira] [Commented] (LUCENE-9853) Use CJKWidthCharFilter as the
default character normalizer for JapaneseAnalyzer instead of CJKWidthFilter
[ https://issues.apache.org/jira/browse/LUCENE-9853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17305660#comment-17305660 ]
Tomoko Uchida commented on LUCENE-9853:
---------------------------------------
Opened https://github.com/apache/lucene/pull/26.
It is often recommended applying Unicode normalization or width normalization as pre-processing for Japanese morphological analysis, so I think this provides good defaults for many use cases.
> Use CJKWidthCharFilter as the default character normalizer for JapaneseAnalyzer instead of CJKWidthFilter
> ---------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-9853
> URL: https://issues.apache.org/jira/browse/LUCENE-9853
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/analysis
> Affects Versions: main (9.0)
> Reporter: Tomoko Uchida
> Assignee: Tomoko Uchida
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Follow-up issue of LUCENE-9413.
> We now have CJKWidthCharFilter in analyzers-common. I believe in many situations it is recommended applying half-width/full-width character normalization before tokenization for consistency in analysis.
> The change slightly affects on the analyzer's outputs. We can provide a parameter to switch back to CJKWidthFilter for backward compatibility.
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