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From "Johan Kindgren (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (LUCENE-1260) Norm codec strategy in Similarity
Date Sun, 21 Jun 2009 15:56:07 GMT

    [ 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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