org.apache.lucene.classification.utils

## Class DatasetSplitter

- java.lang.Object
- - org.apache.lucene.classification.utils.DatasetSplitter

-     public class DatasetSplitter
      extends Object

  Utility class for creating training / test / cross validation indexes from the original index.

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `DatasetSplitter(double testRatio, double crossValidationRatio)` Create a `DatasetSplitter` by giving test and cross validation IDXs sizes

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `split(IndexReader originalIndex, Directory trainingIndex, Directory testIndex, Directory crossValidationIndex, Analyzer analyzer, boolean termVectors, String classFieldName, String... fieldNames)` Split a given index into 3 indexes for training, test and cross validation tasks respectively

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

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

- - ### Constructor Detail

    - #### DatasetSplitter

          public DatasetSplitter(double testRatio,
                                 double crossValidationRatio)

      Create a `DatasetSplitter` by giving test and cross validation IDXs sizes
      Parameters:
        `testRatio` - the ratio of the original index to be used for the test IDX as a `double` between 0.0 and 1.0
        `crossValidationRatio` - the ratio of the original index to be used for the c.v. IDX as a `double` between 0.0 and 1.0

  - ### Method Detail

    - #### split

          public void split(IndexReader originalIndex,
                            Directory trainingIndex,
                            Directory testIndex,
                            Directory crossValidationIndex,
                            Analyzer analyzer,
                            boolean termVectors,
                            String classFieldName,
                            String... fieldNames)
                     throws IOException

      Split a given index into 3 indexes for training, test and cross validation tasks respectively
      Parameters:
        `originalIndex` - an `LeafReader` on the source index
        `trainingIndex` - a `Directory` used to write the training index
        `testIndex` - a `Directory` used to write the test index
        `crossValidationIndex` - a `Directory` used to write the cross validation index
        `analyzer` - `Analyzer` used to create the new docs
        `termVectors` - `true` if term vectors should be kept
        `classFieldName` - name of the field used as the label for classification; this must be indexed with sorted doc values
        `fieldNames` - names of fields that need to be put in the new indexes or `null` if all should be used
      Throws:
        `IOException` - if any writing operation fails on any of the indexes

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