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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1908) Similarity javadocs for scoring function to relate more tightly to scoring models in effect
Date Sat, 12 Sep 2009 21:14:57 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754615#action_12754615
] 

Mark Miller commented on LUCENE-1908:
-------------------------------------

bq. In that work we got best results from Lucene

Thats funny - I didn't notice you were an author one that one! Small world.

The original idea of why the cosine normalization for the doc vector is bad, I got from the
free intro to info retrieval book thats out there -
but what it says doesn't fully jive with the info I am finding elsewhere, or my own common
sense. Thats what has me most confused
at the moment - the intro to ir book appears to break it down so that you can explain it with
the math (why going into the unit vector space favors longer docs) - but other work I am seeing
says
the math tells you no such thing, and its just comparing it to the computed relevancy curve
that tells you its not great.

I dunno :) - though at least I know a lot more than I did a few days ago - it never even occurred
to me how the scoring we did equated to any kind
of dot product before this - I used to read Lucene's scoring algorithm and then look at the
code and it was like .... okay - sure ... - so I've come a long way.

> Similarity javadocs for scoring function to relate more tightly to scoring models in
effect
> -------------------------------------------------------------------------------------------
>
>                 Key: LUCENE-1908
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1908
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Doron Cohen
>            Assignee: Doron Cohen
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: LUCENE-1908.patch, LUCENE-1908.patch
>
>
> See discussion in the related issue.

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