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From "Steven Rowe (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2400) ShingleFilter: don't output all-filler shingles/unigrams; also, convert from TermAttribute to CharTermAttribute
Date Sun, 18 Apr 2010 15:39:26 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steven Rowe updated LUCENE-2400:
--------------------------------

    Attachment: LUCENE-2400.patch

Patch implementing the above-described changes, along with tests confirming that all-filler
shingles/unigrams are no longer output.  A new term attribute called FillerAttribute is defined
to mark whether enqueued terms are filler terms.

Unfortunately, these changes cause a roughly 22% slowdown - contrib/benchmark numbers for
the shingle alg (I got similar numbers for Java 1.5):

JAVA:
java version "1.6.0_13"
Java(TM) SE Runtime Environment (build 1.6.0_13-b03)
Java HotSpot(TM) 64-Bit Server VM (build 11.3-b02, mixed mode)

OS:
cygwin
WinVistaService Pack 2
Service Pack 26060022202561

||Max Shingle Size||Unigrams?||Unpatched||Patched||StandardAnalyzer||Improvement||
|2|no|3.04s|3.33s|2.05s|-22.6%|
|2|yes|3.23s|3.49s|2.05s|-18.0%|
|4|no|4.00s|4.56s|2.05s|-22.2%|
|4|yes|4.13s|4.72s|2.05s|-22.0%|


> ShingleFilter: don't output all-filler shingles/unigrams; also, convert from TermAttribute
to CharTermAttribute
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-2400
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2400
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/analyzers
>    Affects Versions: 3.0.1
>            Reporter: Steven Rowe
>            Priority: Minor
>         Attachments: LUCENE-2400.patch
>
>
> When the input token stream to ShingleFilter has position increments greater than one,
filler tokens are inserted for each position for which there is no token in the input token
stream.  As a result, unigrams (if configured) and shingles can be filler-only.  Filler-only
output tokens make no sense - these should be removed.
> Also, because TermAttribute has been deprecated in favor of CharTermAttribute, the patch
will also convert TermAttribute usages to CharTermAttribute in ShingleFilter.

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