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Posted to dev@lucene.apache.org by "Johan Kindgren (JIRA)" <ji...@apache.org> on 2009/06/21 17:56:07 UTC
[jira] Issue Comment Edited: (LUCENE-1260) Norm codec strategy in
Similarity
[ https://issues.apache.org/jira/browse/LUCENE-1260?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12722374#action_12722374 ]
Johan Kindgren edited comment on LUCENE-1260 at 6/21/09 8:54 AM:
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Removed 'static' keyword to enable a pluggable behavior for encoding/decoding norms. Our business-case for this is to fix scoring when using NGrams. If a word is split into three parts, the norm for these parts would then become ~0.3125 (don't remember exactly) in the current implementation. A search for the exact same word would then generate a score of less than 1.0. With a pluggable norm-calculation, we could use a norm-table with values 0-100 and get a better scoring.
Minor changes in 11 core-classes and some tests. Also minor changes in analyzers, instantiated, memory and miscellaneous.
was (Author: johkin):
Removed 'static' keyword to enable a pluggable behavior for encoding/decoding norms. Our business-case for this is to fix scoring when using NGrams. If a word is split into three parts, the norm for these parts would then become ~0.3125 (don't remember exactly) in the current implementation. A search for the exakt same word would then generate a score of less than 1.0. With a pluggable norm-calculation, we could use a norm-table with values 0-100 and get a better scoring.
Minor changes in 11 core-classes and some tests. Also minor changes in analyzers, instantiated, memory and miscellaneous.
> Norm codec strategy in Similarity
> ---------------------------------
>
> Key: LUCENE-1260
> URL: https://issues.apache.org/jira/browse/LUCENE-1260
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Search
> Affects Versions: 2.3.1
> Reporter: Karl Wettin
> Attachments: Lucene-1260.patch, LUCENE-1260.txt, LUCENE-1260.txt, LUCENE-1260.txt
>
>
> The static span and resolution of the 8 bit norms codec might not fit with all applications.
> My use case requires that 100f-250f is discretized in 60 bags instead of the default.. 10?
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