Implement various ranking models as Similarities
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Key: LUCENE-3220
URL: https://issues.apache.org/jira/browse/LUCENE-3220
Project: Lucene - Java
Issue Type: New Feature
Components: core/search
Affects Versions: flexscoring branch
Reporter: David Mark Nemeskey
Assignee: David Mark Nemeskey
With [LUCENE-3174|https://issues.apache.org/jira/browse/LUCENE-3174] done, we
can finally work on implementing the standard ranking models. Currently DFR,
BM25 and LM are on the menu.
TODO:
* `EasyStats`: contains all statistics that might be relevant for a ranking
algorithm
* `EasySimilarity`: the ancestor of all the other similarities. Hides the
DocScorers and as much implementation detail as possible
* _BM25_: the current "mock" implementation might be OK
* _LM_
* _DFR_
Done:
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