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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