| Package | Description | 
|---|---|
| org.apache.lucene.search.similarities | This package contains the various ranking models that can be used in Lucene. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | IndriDirichletSimilarityBayesian smoothing using Dirichlet priors as implemented in the Indri Search engine
 (http://www.lemurproject.org/indri.php). | 
| class  | LMDirichletSimilarityBayesian smoothing using Dirichlet priors. | 
| class  | LMJelinekMercerSimilarityLanguage model based on the Jelinek-Mercer smoothing method. | 
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