Package org.apache.lucene.classification.utils

# Class ConfusionMatrixGenerator

java.lang.Object
org.apache.lucene.classification.utils.ConfusionMatrixGenerator

public class ConfusionMatrixGenerator extends Object
Utility class to generate the confusion matrix of a `Classifier`

- ## Nested Class Summary

  Nested Classes
  Modifier and Type
  Class
  Description
  `static class`
  `ConfusionMatrixGenerator.ConfusionMatrix`
  a confusion matrix, backed by a `Map` representing the linearized matrix

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static <T> ConfusionMatrixGenerator.ConfusionMatrix`
  `getConfusionMatrix(IndexReader reader, Classifier<T> classifier, String classFieldName, String textFieldName, long timeoutMilliseconds)`
  get the `ConfusionMatrixGenerator.ConfusionMatrix` of a given `Classifier`, generated on the given `IndexReader`, class and text fields.

  ### Methods inherited from class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Method Details

  - ### getConfusionMatrix

    public static <T> ConfusionMatrixGenerator.ConfusionMatrix getConfusionMatrix(IndexReader reader, Classifier<T> classifier, String classFieldName, String textFieldName, long timeoutMilliseconds) throws IOException
    get the `ConfusionMatrixGenerator.ConfusionMatrix` of a given `Classifier`, generated on the given `IndexReader`, class and text fields.
    Type Parameters:
      `T` - the return type of the `ClassificationResult` returned by the given `Classifier`
    Parameters:
      `reader` - the `IndexReader` containing the index used for creating the `Classifier`
      `classifier` - the `Classifier` whose confusion matrix has to be generated
      `classFieldName` - the name of the Lucene field used as the classifier's output
      `textFieldName` - the nome the Lucene field used as the classifier's input
      `timeoutMilliseconds` - timeout to wait before stopping creating the confusion matrix
    Returns:
      a `ConfusionMatrixGenerator.ConfusionMatrix`
    Throws:
      `IOException` - if problems occurr while reading the index or using the classifier