weka.classifiers.trees.j48

## Class C45ModelSelection

- java.lang.Object
- - weka.classifiers.trees.j48.ModelSelection
  - - weka.classifiers.trees.j48.C45ModelSelection

- All Implemented Interfaces:
    java.io.Serializable, RevisionHandler

      public class C45ModelSelection
      extends ModelSelection

  Class for selecting a C4.5-type split for a given dataset.
  Version:
    $Revision: 10531 $
  Author:
    Eibe Frank (eibe@cs.waikato.ac.nz)
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `C45ModelSelection(int minNoObj, Instances allData, boolean useMDLcorrection, boolean doNotMakeSplitPointActualValue)` Initializes the split selection method with the given parameters.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `cleanup()` Sets reference to training data to null.
    `java.lang.String` | `getRevision()` Returns the revision string.
    `ClassifierSplitModel` | `selectModel(Instances data)` Selects C4.5-type split for the given dataset.
    `ClassifierSplitModel` | `selectModel(Instances train, Instances test)` Selects C4.5-type split for the given dataset.

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

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

- - ### Constructor Detail

    - #### C45ModelSelection

          public C45ModelSelection(int minNoObj,
                           Instances allData,
                           boolean useMDLcorrection,
                           boolean doNotMakeSplitPointActualValue)

      Initializes the split selection method with the given parameters.
      Parameters:
        `minNoObj` - minimum number of instances that have to occur in at least two subsets induced by split
        `allData` - FULL training dataset (necessary for selection of split points).
        `useMDLcorrection` - whether to use MDL adjustement when finding splits on numeric attributes
        `doNotMakeSplitPointActualValue` - if true, split point is not relocated by scanning the entire dataset for the closest data value

  - ### Method Detail

    - #### cleanup

          public void cleanup()

      Sets reference to training data to null.

    - #### selectModel

          public final ClassifierSplitModel selectModel(Instances data)

      Selects C4.5-type split for the given dataset.
      Specified by:
        `selectModel` in class `ModelSelection`

    - #### selectModel

          public final ClassifierSplitModel selectModel(Instances train,
                                         Instances test)

      Selects C4.5-type split for the given dataset.
      Overrides:
        `selectModel` in class `ModelSelection`

    - #### getRevision

          public java.lang.String getRevision()

      Returns the revision string.
      Returns:
        the revision