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Posted to dev@lucene.apache.org by "Mark Miller (JIRA)" <ji...@apache.org> on 2009/09/07 23:56:57 UTC
[jira] Issue Comment Edited: (LUCENE-1896) Modify confusing javadoc
for queryNorm
[ https://issues.apache.org/jira/browse/LUCENE-1896?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12752271#action_12752271 ]
Mark Miller edited comment on LUCENE-1896 at 9/7/09 2:55 PM:
-------------------------------------------------------------
Hmm .. so perhaps the idea that the query scores are more comparable comes from:
if we take it out, that means the score will be the cosine times the euclidean distance - the distance will be rather large for a small query vector and a large doc vector (in magnitude). So a query that matched many large docs would could scale a lot harder than a query that hit small docs?
I guess that makes sense - scores not being very comparable anyway though, it hardly seems worth the extra compute cost ...
was (Author: markrmiller@gmail.com):
Hmm .. so perhaps the idea that they query scores are more comparable comes from:
if we take it out, that means the score will be the cosine X the euclidean distance - the distance will be rather large for a small query vector and a large doc vector (in magnitude). So a query that matched many large docs would could scale a lot harder than a query that hit small docs?
I guess that makes sense - scores not being very comparable anyway though, it hardly seems worth the extra compute cost ...
> Modify confusing javadoc for queryNorm
> --------------------------------------
>
> Key: LUCENE-1896
> URL: https://issues.apache.org/jira/browse/LUCENE-1896
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Javadocs
> Reporter: Jiri Kuhn
> Priority: Minor
> Fix For: 2.9
>
>
> See http://markmail.org/message/arai6silfiktwcer
> The javadoc confuses me as well.
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