POSEvaluator (Apache OpenNLP Tools 2.2.0 API)

java.lang.Object
- opennlp.tools.util.eval.Evaluator<POSSample>
- - opennlp.tools.postag.POSEvaluator

```
public class POSEvaluator
extends Evaluator<POSSample>
```
The POSEvaluator measures the performance of the given POSTagger with the provided reference samples.

Constructor Summary

Constructors
Constructor Description

POSEvaluator(POSTagger tagger, POSTaggerEvaluationMonitor... listeners)
Initializes the current instance.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`double`	`getWordAccuracy()`	Accuracy defined as: `word accuracy = correctly detected tags / total words`
`long`	`getWordCount()`
`String`	`toString()`	Represents this object as human-readable `String`.

Methods inherited from class opennlp.tools.util.eval.Evaluator
evaluate, evaluateSample

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

- Constructor Detail
  - POSEvaluator
```
public POSEvaluator(POSTagger tagger,
                    POSTaggerEvaluationMonitor... listeners)
```
    Initializes the current instance.
    
    Parameters:
    
    tagger - The POSTagger to evaluate.
    
    listeners - the evaluation listeners.
- Method Detail
  - getWordAccuracy
```
public double getWordAccuracy()
```
    Accuracy defined as: word accuracy = correctly detected tags / total words
    
    Returns:
    
    Retrieves the mean word accuracy.
  - getWordCount
```
public long getWordCount()
```
    Returns:
    
    Retrieves the total number of words considered in the evaluation.
  - toString
```
public String toString()
```
    Represents this object as human-readable String.
    
    Overrides:
    
    toString in class Object