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https://issues.apache.org/jira/browse/LUCENE-8816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16853504#comment-16853504
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Tomoko Uchida commented on LUCENE-8816:
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{quote}But I think BinaryDirectoryWriter case can be solved if we separate
methods. (+ use DictionaryFormat)
Can I try this when you are concentrating on JapaneseTokenizer?
{quote}
Please open another issue for this. Any generalization of DictionaryBuilder and
its auxiliary classes should be treated another issue, if you agree with my
plan.
{quote} - First, decouple the encoded system dictionary (mecab-ipadic) to a
separated jar from the kuromoji jar and clean up the dictionary builder tool.
This is the scope of this issue.
- Then generalize the dictionary builder tool to make it able to handle Korean
dictionary (mecab-ko-dic), on the separated issue.
- Lastly decouple the korean system dictionary to a separated jar from the
nori jar, maybe on the another issue.{quote}
Just to make things clear, I will focus on JapaneseTokenizer *and*
DictionaryBuilder in kuromoji module on this issue so the DictionaryBuilder
(including its auxiliary classes) can be significantly modified here. 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?
> 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 Kuromoji (MeCab IPADIC) is a bit old and no longer maintained for many years.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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