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https://issues.apache.org/jira/browse/LUCENE-3699?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir updated LUCENE-3699:
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Attachment: LUCENE-3699_more.patch
here is a second patch removing ~ 1.3MB of the dictionary (jar file reduced to
4.5MB).
There are two changes:
* baseform (stems) typically share prefixes with surface forms, so write a
shared prefix amount and only the suffix.
* for many entries (e.g. ones with no kanji), the reading is the same as the
surface form if you map any hiragana to katakana, so just flag with a bit in
that case.
there is a todo in the patch where we can save another 150KB, but i think it
would complicate the reader at this time so I didn't do it.
> kuromoji dictionary could be more compact
> -----------------------------------------
>
> Key: LUCENE-3699
> URL: https://issues.apache.org/jira/browse/LUCENE-3699
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Robert Muir
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3699.patch, LUCENE-3699_more.patch
>
>
> Reading thru the ipadic documentation, i realized we are storing a lot of
> redundant information,
> for example the connection costs for bigram weights are based on
> POS+inflection data, so its redundant
> to also separately encode POS and inflection data for each entry.
> With the patch the dictionary access is also faster and simpler, and
> TokenInfoDictionary is 1.5MB smaller.
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