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https://issues.apache.org/jira/browse/LUCENE-8816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16853678#comment-16853678
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Namgyu Kim commented on LUCENE-8816:
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Oh, you're right. [~tomoko] :D
 I'll make a new JIRA issue after clean up the changes.
{quote}To avoid confusion, personally I'd like to proceed things in a right 
order - cleaning up first, then generalizing. But if you are sure that we can 
go in parallel, can you share your plan?
{quote}
Sure. It's an important thing.
 I think we can proceed in parallel.

There are two possible cases.
 1) You finish between JapaneseTokenizer and DictionaryBuilder job first.
 In that case, I can pull your new code and merge with nori's DictionaryBuilder.

2) I finish merging DictionaryBuilder(nori) and DictionaryBuilder(kuromoji) 
first.
 In that case, you can pull and continue.
 The DictionaryBuilder logic of kuromoji does not change at all in my work.

But if you think it is a little inefficient, I'll do later.
 What do you think about it?

> Decouple Kuromoji's morphological analyser and its dictionary
> -------------------------------------------------------------
>
>                 Key: LUCENE-8816
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8816
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/analysis
>            Reporter: Tomoko Uchida
>            Priority: Major
>
> I've inspired by this mail-list thread.
>  
> [http://mail-archives.apache.org/mod_mbox/lucene-java-user/201905.mbox/%3CCAGUSZHA3U_vWpRfxQb4jttT7sAOu%2BuaU8MfvXSYgNP9s9JNsXw%40mail.gmail.com%3E]
> As many Japanese already know, default built-in dictionary bundled with 
> Kuromoji (MeCab IPADIC) is a bit old and no longer maintained for many years. 
> While it has been slowly obsoleted, well-maintained and/or extended 
> dictionaries risen up in recent years (e.g. 
> [mecab-ipadic-neologd|https://github.com/neologd/mecab-ipadic-neologd], 
> [UniDic|https://unidic.ninjal.ac.jp/]). To use them with Kuromoji, some 
> attempts/projects/efforts are made in Japan.
> However current architecture - dictionary bundled jar - is essentially 
> incompatible with the idea "switch the system dictionary", and developers 
> have difficulties to do so.
> Traditionally, the morphological analysis engine (viterbi logic) and the 
> encoded dictionary (language model) had been decoupled (like MeCab, the 
> origin of Kuromoji, or lucene-gosen). So actually decoupling them is a 
> natural idea, and I feel that it's good time to re-think the current 
> architecture.
> Also this would be good for advanced users who have customized/re-trained 
> their own system dictionary.
> Goals of this issue:
>  * Decouple JapaneseTokenizer itself and encoded system dictionary.
>  * Implement dynamic dictionary load mechanism.
>  * Provide developer-oriented dictionary build tool.
> Non-goals:
>   * Provide learner or language model (it's up to users and should be outside 
> the scope).
> I have not dove into the code yet, so have no idea about it's easy or 
> difficult at this moment.



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