Distribution (Lucene 9.11.1 core API)

java.lang.Object
- org.apache.lucene.search.similarities.Distribution

Direct Known Subclasses:

DistributionLL, DistributionSPL
```
public abstract class Distribution
extends Object
```
The probabilistic distribution used to model term occurrence in information-based models.

See Also:

IBSimilarity

WARNING: This API is experimental and might change in incompatible ways in the next release.

Constructor Summary

Constructors
Constructor Description

Distribution()
Sole constructor.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`Explanation`	`explain(BasicStats stats, double tfn, double lambda)`	Explains the score.
`abstract double`	`score(BasicStats stats, double tfn, double lambda)`	Computes the score.
`abstract String`	`toString()`	Subclasses must override this method to return the name of the distribution.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - Distribution
```
public Distribution()
```
    Sole constructor. (For invocation by subclass constructors, typically implicit.)
- Method Detail
  - score
```
public abstract double score(BasicStats stats,
                             double tfn,
                             double lambda)
```
    Computes the score.
  - explain
```
public Explanation explain(BasicStats stats,
                           double tfn,
                           double lambda)
```
    Explains the score. Returns the name of the model only, since both tfn and lambda are explained elsewhere.
  - toString
```
public abstract String toString()
```
    Subclasses must override this method to return the name of the distribution.
    
    Overrides:
    
    toString in class Object