| 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 | 
|---|---|
| static class  | LMSimilarity.DefaultCollectionModelModels  p(w|C)as the number of occurrences of the term in the
 collection, divided by the total number of tokens+ 1. | 
| Modifier and Type | Field and Description | 
|---|---|
| protected LMSimilarity.CollectionModel | LMSimilarity. collectionModelThe collection model. | 
| Constructor and Description | 
|---|
| LMDirichletSimilarity(LMSimilarity.CollectionModel collectionModel)Instantiates the similarity with the default μ value of 2000. | 
| LMDirichletSimilarity(LMSimilarity.CollectionModel collectionModel,
                     float mu)Instantiates the similarity with the provided μ parameter. | 
| LMJelinekMercerSimilarity(LMSimilarity.CollectionModel collectionModel,
                         float lambda)Instantiates with the specified collectionModel and λ parameter. | 
| LMSimilarity(LMSimilarity.CollectionModel collectionModel)Creates a new instance with the specified collection language model. | 
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