[ http://issues.apache.org/jira/browse/LUCENE-577?page=all ]
Hoss Man resolved LUCENE-577:
-----------------------------
Fix Version: 2.0
Resolution: Fixed
Assign To: Hoss Man
Commited with some small changes: mainly adding Apache Copyright/License and
switching the default value of tf_hyper_base to 1.3d (the old default of Math.E
is typically used in hyperbolic tangents, but made little sense in the context
of a tf function)
> SweetSpotSimiliarity
> --------------------
>
> Key: LUCENE-577
> URL: http://issues.apache.org/jira/browse/LUCENE-577
> Project: Lucene - Java
> Type: New Feature
> Components: Search
> Reporter: Hoss Man
> Assignee: Hoss Man
> Priority: Minor
> Fix For: 2.0
> 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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