BasicModel (Jackrabbit Oak 1.78.0 API)

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

Direct Known Subclasses:

BasicModelBE, BasicModelD, BasicModelG, BasicModelIF, BasicModelIn, BasicModelIne, BasicModelP
```
public abstract class BasicModel
extends Object
```
This class acts as the base class for the specific basic model implementations in the DFR framework. Basic models compute the informative content Inf₁ = -log₂Prob₁ .

See Also:

DFRSimilarity

Constructor Summary

Constructors
Constructor Description

BasicModel()
Sole constructor.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`Explanation`	`explain(BasicStats stats, float tfn)`	Returns an explanation for the score.
`abstract float`	`score(BasicStats stats, float tfn)`	Returns the informative content score.
`abstract String`	`toString()`	Subclasses must override this method to return the code of the basic model formula.

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

- Constructor Detail
  - BasicModel
```
public BasicModel()
```
    Sole constructor. (For invocation by subclass constructors, typically implicit.)
- Method Detail
  - score
```
public abstract float score(BasicStats stats,
                            float tfn)
```
    Returns the informative content score.
  - explain
```
public Explanation explain(BasicStats stats,
                           float tfn)
```
    Returns an explanation for the score.
    Most basic models use the number of documents and the total term frequency to compute Inf₁. This method provides a generic explanation for such models. Subclasses that use other statistics must override this method.
  - toString
```
public abstract String toString()
```
    Subclasses must override this method to return the code of the basic model formula. Refer to the original paper for the list.
    
    Overrides:
    
    toString in class Object