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https://issues.apache.org/jira/browse/LUCENE-8977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Namgyu Kim updated LUCENE-8977:
-------------------------------
Description:
As we discussed on LUCENE-8966, KoreanTokenizer always divides into one and the
others now when there are continuous punctuation marks.
(사이즈.... => [사이즈] [.] [...])
But KoreanTokenizer doesn't divide when first character is punctuation.
(...사이즈 => [...] [사이즈])
It looks like the result from the viterbi path, but users can think weird about
the following case:
("사이즈" means "size" in Korean)
||Case #1||Case #2||
|Input : "...사이즈..."|Input : "...4......4사이즈"|
|Result : [...] [사이즈] [.] [..]|Result : [...] [4] [.] [.....] [4] [사이즈]|
>From what I checked, Nori has a punctuation characters(like . ,) in the
>dictionary but Kuromoji is not.
("サイズ" means "size" in Japanese)
||Case #1||Case #2||
|Input : "...サイズ..."|Input : "...4......4サイズ"|
|Result : [...] [サイズ] [...]|Result : [...] [4] [......] [4] [サイズ]|
There are some ways to resolve it like hard-coding for punctuation but it seems
not good.
So I think we need to discuss it.
was:
As we discussed on LUCENE-8966, KoreanTokenizer always divides into one and the
others now when there are continuous punctuation marks.
(사이즈.... => [사이즈] [.] [...])
But KoreanTokenizer doesn't divides when first character is punctuation.
(...사이즈 => [...] [사이즈])
It looks like the result from the viterbi path, but users can think weird about
the following case:
("사이즈" means "size" in Korean)
||Case #1||Case #2||
|Input : "...사이즈..."|Input : "...4......4사이즈"|
|Result : [...] [사이즈] [.] [..]|Result : [...] [4] [.] [.....] [4] [사이즈]|
>From what I checked, Nori has a punctuation characters(like . ,) in the
>dictionary but Kuromoji is not.
("サイズ" means "size" in Japanese)
||Case #1||Case #2||
|Input : "...サイズ..."|Input : "...4......4サイズ"|
|Result : [...] [サイズ] [...]|Result : [...] [4] [......] [4] [サイズ]|
There are some ways to resolve it like hard-coding for punctuation but it seems
not good.
So I think we need to discuss it.
> Handle punctuation characters in KoreanTokenizer
> ------------------------------------------------
>
> Key: LUCENE-8977
> URL: https://issues.apache.org/jira/browse/LUCENE-8977
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Namgyu Kim
> Priority: Minor
>
> As we discussed on LUCENE-8966, KoreanTokenizer always divides into one and
> the others now when there are continuous punctuation marks.
> (사이즈.... => [사이즈] [.] [...])
> But KoreanTokenizer doesn't divide when first character is punctuation.
> (...사이즈 => [...] [사이즈])
> It looks like the result from the viterbi path, but users can think weird
> about the following case:
> ("사이즈" means "size" in Korean)
> ||Case #1||Case #2||
> |Input : "...사이즈..."|Input : "...4......4사이즈"|
> |Result : [...] [사이즈] [.] [..]|Result : [...] [4] [.] [.....] [4] [사이즈]|
> From what I checked, Nori has a punctuation characters(like . ,) in the
> dictionary but Kuromoji is not.
> ("サイズ" means "size" in Japanese)
> ||Case #1||Case #2||
> |Input : "...サイズ..."|Input : "...4......4サイズ"|
> |Result : [...] [サイズ] [...]|Result : [...] [4] [......] [4] [サイズ]|
> There are some ways to resolve it like hard-coding for punctuation but it
> seems not good.
> So I think we need to discuss it.
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