# 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.
  org.apache.lucene.search.spans | The calculus of spans.

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

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

- Classes in org.apache.lucene.search.similarities used by org.apache.lucene.search.similarities
  Class and 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 API for scoring "sloppy" queries such as `TermQuery`, `SpanQuery`, and `PhraseQuery`.
  Similarity.SimWeight 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.

- Classes in org.apache.lucene.search.similarities used by org.apache.lucene.search.spans
  Class and Description
  Similarity Similarity defines the components of Lucene scoring.
  Similarity.SimScorer API for scoring "sloppy" queries such as `TermQuery`, `SpanQuery`, and `PhraseQuery`.
  Similarity.SimWeight Stores the weight for a query across the indexed collection.

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