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From "Robert Muir (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3940) When Japanese (Kuromoji) tokenizer removes a punctuation token it should leave a hole
Date Mon, 02 Apr 2012 11:01:22 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13244118#comment-13244118
] 

Robert Muir commented on LUCENE-3940:
-------------------------------------

{quote}
Perhaps it's useful to distinguish between analysis for information retrieval and analysis
for information extraction here?
{quote}

Yes, since we are an information retrieval library, then there is no sense in adding *traps*
and *complexity* to our analysis API.

{quote}
I like Michael's and Steven's idea of doing tokenization that doesn't discard any information.
{quote}

For IR, this is definitely not information... calling it data is a stretch.

{quote}
If there's an established convention that Tokenizer variants discards punctuation and produces
the terms that are meant to be directly searchable, it sounds like a good idea that we stick
to the convention here as well.
{quote}

Thats what the tokenizers do today, they find tokens (In the IR sense). So yeah, there is
an established convention already. Changing
this would be a *monster trap* because suddenly tons of people would be indexing tons of useless
punctuation. I would strongly
oppose such a change.




                
> When Japanese (Kuromoji) tokenizer removes a punctuation token it should leave a hole
> -------------------------------------------------------------------------------------
>
>                 Key: LUCENE-3940
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3940
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: LUCENE-3940.patch, LUCENE-3940.patch, LUCENE-3940.patch, LUCENE-3940.patch
>
>
> I modified BaseTokenStreamTestCase to assert that the start/end
> offsets match for graph (posLen > 1) tokens, and this caught a bug in
> Kuromoji when the decompounding of a compound token has a punctuation
> token that's dropped.
> In this case we should leave hole(s) so that the graph is intact, ie,
> the graph should look the same as if the punctuation tokens were not
> initially removed, but then a StopFilter had removed them.
> This also affects tokens that have no compound over them, ie we fail
> to leave a hole today when we remove the punctuation tokens.
> I'm not sure this is serious enough to warrant fixing in 3.6 at the
> last minute...

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