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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-577) SweetSpotSimiliarity
Date Wed, 24 May 2006 00:55:30 GMT
     [ http://issues.apache.org/jira/browse/LUCENE-577?page=all ]

Hoss Man updated LUCENE-577:
----------------------------

    Attachment: ss.patch

patch file containing class and test cases

> SweetSpotSimiliarity
> --------------------
>
>          Key: LUCENE-577
>          URL: http://issues.apache.org/jira/browse/LUCENE-577
>      Project: Lucene - Java
>         Type: New Feature

>   Components: Search
>     Reporter: Hoss Man
>     Priority: Minor
>  Attachments: ss.patch
>
> This is a new Similarity implimention for the contrib/miscellaneous/ package, it provides
a Similiarty designed for people who know the "sweetspot" of their data.  three major pieces
of functionality are included:
> 1) a lengthNorm which creates a "platuea" of values.
> 2) a baseline tf that provides a fixed value for tf's up to a minimum, at which point
it becomes a sqrt curve (this is used by the tf(int) function.
> 3) a hyperbolic tf function which is best explained by graphing the equation.  this isn't
used by default, but is available for subclasses to call from their own tf functions.
> All constants used in all functions are configurable.  In the case of lengthNorm, the
constants are configurable per field, as well as allowing for defaults for unspecified fields.

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