# Uses of Package
org.apache.lucene.search.similarities

- Packages that use org.apache.lucene.search.similarities
  Package | Description
  --- | ---
  org.apache.lucene.index | Code to maintain and access indices.
  org.apache.lucene.search | Code to search indices.
  org.apache.lucene.search.similarities | This package contains the various ranking models that can be used in Lucene.

- Classes in org.apache.lucene.search.similarities used by org.apache.lucene.index
  Class | Description
  --- | ---
  Similarity | Similarity defines the components of Lucene scoring.

- Classes in org.apache.lucene.search.similarities used by org.apache.lucene.search
  Class | Description
  --- | ---
  Similarity | Similarity defines the components of Lucene scoring.
  Similarity.SimScorer | Stores the weight for a query across the indexed collection.

- Classes in org.apache.lucene.search.similarities used by org.apache.lucene.search.similarities
  Class | Description
  --- | ---
  AfterEffect | This class acts as the base class for the implementations of the first normalization of the informative content in the DFR framework.
  Axiomatic | Axiomatic approaches for IR.
  BasicModel | This class acts as the base class for the specific basic model implementations in the DFR framework.
  BasicStats | Stores all statistics commonly used ranking methods.
  Distribution | The probabilistic distribution used to model term occurrence in information-based models.
  Independence | Computes the measure of divergence from independence for DFI scoring functions.
  Lambda | The lambda (λw) parameter in information-based models.
  LMSimilarity | Abstract superclass for language modeling Similarities.
  LMSimilarity.CollectionModel | A strategy for computing the collection language model.
  Normalization | This class acts as the base class for the implementations of the term frequency normalization methods in the DFR framework.
  Similarity | Similarity defines the components of Lucene scoring.
  Similarity.SimScorer | Stores the weight for a query across the indexed collection.
  SimilarityBase | A subclass of `Similarity` that provides a simplified API for its descendants.
  TFIDFSimilarity | Implementation of `Similarity` with the Vector Space Model.