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From "Hoss Man (JIRA)" <j...@apache.org>
Subject [jira] Created: (LUCENE-577) SweetSpotSimiliarity
Date Wed, 24 May 2006 00:55:29 GMT
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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