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https://issues.apache.org/jira/browse/LUCENE-8816?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16849755#comment-16849755
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Tomoko Uchida commented on LUCENE-8816:
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[~rcmuir] [~sokolov]: Thanks for the comments and advice!
bq. What if we changed the various dictionary classes to load-on-demand from a
configurable classpath-directory, rather than from a single built-in one?
About this point, I thought it would be better the each encoded dictionary has
its "name" and users specify the dictionary name to be used at some point of
initialization (for safety reasons because there could be multiple re-trained
models), rather than completely auto discovering something like SLF4J does so.
Just an idea.
> 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 Kuromoji (MeCab IPADIC) is a bit old and no longer maintained for many years.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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