Perfect (CF4J 2.3.0 API Documentation)

java.lang.Object
- es.upm.etsisi.cf4j.qualityMeasure.QualityMeasure
- - es.upm.etsisi.cf4j.qualityMeasure.prediction.Perfect

```
public class Perfect
extends QualityMeasure
```
This class calculates the percentage of perfect predictions. A prediction is considered perfect if and only if the absolute difference between the test rating and the prediction is less or equal than a threshold.

Field Summary
- Fields inherited from class es.upm.etsisi.cf4j.qualityMeasure.QualityMeasure
  recommender

Constructor Summary

Constructors
Constructor	Description
`Perfect(Recommender recommender, double threshold)`	Constructor of the class which basically calls the father's one
`Perfect(Recommender recommender, Map<String,Object> params)`	Constructor from a Map object with the quality measure parameters.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`getScore(TestUser testUser, double[] predictions)`	Computes the quality measure score for a TestUser given the predictions for his/her test ratings

Methods inherited from class es.upm.etsisi.cf4j.qualityMeasure.QualityMeasure
getScore, getScore

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

- Constructor Detail
  - Perfect
```
public Perfect(Recommender recommender,
               Map<String,Object> params)
```
    Constructor from a Map object with the quality measure parameters. Map object must contains the following keys:
    
    threshold: double value that defines the allowed threshold to measure if a prediction is perfect or not.
    Parameters:
    
    recommender - Recommender instance for which the Perfect score are going to be computed
    
    params - Quality measure's parameters
  - Perfect
```
public Perfect(Recommender recommender,
               double threshold)
```
    Constructor of the class which basically calls the father's one
    
    Parameters:
    
    recommender - Recommender instance for which the perfect score are going to be computed
    
    threshold - Threshold value to measure if a prediction is perfect or not
- Method Detail
  - getScore
```
public double getScore(TestUser testUser,
                       double[] predictions)
```
    Description copied from class: QualityMeasure
    
    Computes the quality measure score for a TestUser given the predictions for his/her test ratings
    
    Specified by:
    
    getScore in class QualityMeasure
    
    Parameters:
    
    testUser - TestUser for which the quality measure score is computed
    
    predictions - Prediction value for the test items rated by the test user
    
    Returns:
    
    Quality measure score