weka.classifiers.trees

## Class REPTree

- java.lang.Object
- - weka.classifiers.AbstractClassifier
  - - weka.classifiers.trees.REPTree

- All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, Classifier, Sourcable, AdditionalMeasureProducer, BatchPredictor, CapabilitiesHandler, CapabilitiesIgnorer, Drawable, OptionHandler, PartitionGenerator, Randomizable, RevisionHandler, WeightedInstancesHandler

      public class REPTree
      extends AbstractClassifier
      implements OptionHandler, WeightedInstancesHandler, Drawable, AdditionalMeasureProducer, Sourcable, PartitionGenerator, Randomizable

  Fast decision tree learner. Builds a decision/regression tree using information gain/variance and prunes it using reduced-error pruning (with backfitting). Only sorts values for numeric attributes once. Missing values are dealt with by splitting the corresponding instances into pieces (i.e. as in C4.5).

  Valid options are:

       -M <minimum number of instances>
        Set minimum number of instances per leaf (default 2).

       -V <minimum variance for split>
        Set minimum numeric class variance proportion
        of train variance for split (default 1e-3).

       -N <number of folds>
        Number of folds for reduced error pruning (default 3).

       -S <seed>
        Seed for random data shuffling (default 1).

       -P
        No pruning.

       -L
        Maximum tree depth (default -1, no maximum)

  Version:
    $Revision: 11615 $
  Author:
    Eibe Frank (eibe@cs.waikato.ac.nz)
  See Also:
    Serialized Form

- - ### Field Summary

    - ### Fields inherited from class weka.classifiers.AbstractClassifier

      `NUM_DECIMAL_PLACES_DEFAULT`

    - ### Fields inherited from interface weka.core.Drawable

      `BayesNet, Newick, NOT_DRAWABLE, TREE`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `REPTree()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `buildClassifier(Instances data)` Builds classifier.
    `double[]` | `distributionForInstance(Instance instance)` Computes class distribution of an instance using the tree.
    `java.util.Enumeration<java.lang.String>` | `enumerateMeasures()` Returns an enumeration of the additional measure names.
    `void` | `generatePartition(Instances data)` Builds the classifier to generate a partition.
    `Capabilities` | `getCapabilities()` Returns default capabilities of the classifier.
    `double` | `getInitialCount()` Get the value of InitialCount.
    `int` | `getMaxDepth()` Get the value of MaxDepth.
    `double` | `getMeasure(java.lang.String additionalMeasureName)` Returns the value of the named measure.
    `double[]` | `getMembershipValues(Instance instance)` Computes array that indicates node membership.
    `double` | `getMinNum()` Get the value of MinNum.
    `double` | `getMinVarianceProp()` Get the value of MinVarianceProp.
    `boolean` | `getNoPruning()` Get the value of NoPruning.
    `int` | `getNumFolds()` Get the value of NumFolds.
    `java.lang.String[]` | `getOptions()` Gets options from this classifier.
    `java.lang.String` | `getRevision()` Returns the revision string.
    `int` | `getSeed()` Get the value of Seed.
    `boolean` | `getSpreadInitialCount()` Get the value of SpreadInitialCount.
    `java.lang.String` | `globalInfo()` Returns a string describing classifier
    `java.lang.String` | `graph()` Outputs the decision tree as a graph
    `int` | `graphType()` Returns the type of graph this classifier represents.
    `java.lang.String` | `initialCountTipText()` Returns the tip text for this property
    `java.util.Enumeration<Option>` | `listOptions()` Lists the command-line options for this classifier.
    `static void` | `main(java.lang.String[] argv)` Main method for this class.
    `java.lang.String` | `maxDepthTipText()` Returns the tip text for this property
    `java.lang.String` | `minNumTipText()` Returns the tip text for this property
    `java.lang.String` | `minVariancePropTipText()` Returns the tip text for this property
    `java.lang.String` | `noPruningTipText()` Returns the tip text for this property
    `int` | `numElements()` Returns the number of elements in the partition.
    `java.lang.String` | `numFoldsTipText()` Returns the tip text for this property
    `int` | `numNodes()` Computes size of the tree.
    `java.lang.String` | `seedTipText()` Returns the tip text for this property
    `void` | `setInitialCount(double newInitialCount)` Set the value of InitialCount.
    `void` | `setMaxDepth(int newMaxDepth)` Set the value of MaxDepth.
    `void` | `setMinNum(double newMinNum)` Set the value of MinNum.
    `void` | `setMinVarianceProp(double newMinVarianceProp)` Set the value of MinVarianceProp.
    `void` | `setNoPruning(boolean newNoPruning)` Set the value of NoPruning.
    `void` | `setNumFolds(int newNumFolds)` Set the value of NumFolds.
    `void` | `setOptions(java.lang.String[] options)` Parses a given list of options.
    `void` | `setSeed(int newSeed)` Set the value of Seed.
    `void` | `setSpreadInitialCount(boolean newSpreadInitialCount)` Set the value of SpreadInitialCount.
    `java.lang.String` | `spreadInitialCountTipText()` Returns the tip text for this property
    `java.lang.String` | `toSource(java.lang.String className)` Returns the tree as if-then statements.
    `java.lang.String` | `toString()` Outputs the decision tree.

    - ### Methods inherited from class weka.classifiers.AbstractClassifier

      `batchSizeTipText, classifyInstance, debugTipText, distributionsForInstances, doNotCheckCapabilitiesTipText, forName, getBatchSize, getDebug, getDoNotCheckCapabilities, getNumDecimalPlaces, implementsMoreEfficientBatchPrediction, makeCopies, makeCopy, numDecimalPlacesTipText, runClassifier, setBatchSize, setDebug, setDoNotCheckCapabilities, setNumDecimalPlaces`

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

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

- - ### Constructor Detail

    - #### REPTree

          public REPTree()

  - ### Method Detail

    - #### globalInfo

          public java.lang.String globalInfo()

      Returns a string describing classifier
      Returns:
        a description suitable for displaying in the explorer/experimenter gui

    - #### noPruningTipText

          public java.lang.String noPruningTipText()

      Returns the tip text for this property
      Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

    - #### getNoPruning

          public boolean getNoPruning()

      Get the value of NoPruning.
      Returns:
        Value of NoPruning.

    - #### setNoPruning

          public void setNoPruning(boolean newNoPruning)

      Set the value of NoPruning.
      Parameters:
        `newNoPruning` - Value to assign to NoPruning.

    - #### minNumTipText

          public java.lang.String minNumTipText()

      Returns the tip text for this property
      Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

    - #### getMinNum

          public double getMinNum()

      Get the value of MinNum.
      Returns:
        Value of MinNum.

    - #### setMinNum

          public void setMinNum(double newMinNum)

      Set the value of MinNum.
      Parameters:
        `newMinNum` - Value to assign to MinNum.

    - #### minVariancePropTipText

          public java.lang.String minVariancePropTipText()

      Returns the tip text for this property
      Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

    - #### getMinVarianceProp

          public double getMinVarianceProp()

      Get the value of MinVarianceProp.
      Returns:
        Value of MinVarianceProp.

    - #### setMinVarianceProp

          public void setMinVarianceProp(double newMinVarianceProp)

      Set the value of MinVarianceProp.
      Parameters:
        `newMinVarianceProp` - Value to assign to MinVarianceProp.

    - #### seedTipText

          public java.lang.String seedTipText()

      Returns the tip text for this property
      Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

    - #### getSeed

          public int getSeed()

      Get the value of Seed.
      Specified by:
        `getSeed` in interface `Randomizable`
      Returns:
        Value of Seed.

    - #### setSeed

          public void setSeed(int newSeed)

      Set the value of Seed.
      Specified by:
        `setSeed` in interface `Randomizable`
      Parameters:
        `newSeed` - Value to assign to Seed.

    - #### numFoldsTipText

          public java.lang.String numFoldsTipText()

      Returns the tip text for this property
      Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

    - #### getNumFolds

          public int getNumFolds()

      Get the value of NumFolds.
      Returns:
        Value of NumFolds.

    - #### setNumFolds

          public void setNumFolds(int newNumFolds)

      Set the value of NumFolds.
      Parameters:
        `newNumFolds` - Value to assign to NumFolds.

    - #### maxDepthTipText

          public java.lang.String maxDepthTipText()

      Returns the tip text for this property
      Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

    - #### getMaxDepth

          public int getMaxDepth()

      Get the value of MaxDepth.
      Returns:
        Value of MaxDepth.

    - #### setMaxDepth

          public void setMaxDepth(int newMaxDepth)

      Set the value of MaxDepth.
      Parameters:
        `newMaxDepth` - Value to assign to MaxDepth.

    - #### initialCountTipText

          public java.lang.String initialCountTipText()

      Returns the tip text for this property
      Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

    - #### getInitialCount

          public double getInitialCount()

      Get the value of InitialCount.
      Returns:
        Value of InitialCount.

    - #### setInitialCount

          public void setInitialCount(double newInitialCount)

      Set the value of InitialCount.
      Parameters:
        `newInitialCount` - Value to assign to InitialCount.

    - #### spreadInitialCountTipText

          public java.lang.String spreadInitialCountTipText()

      Returns the tip text for this property
      Returns:
        tip text for this property suitable for displaying in the explorer/experimenter gui

    - #### getSpreadInitialCount

          public boolean getSpreadInitialCount()

      Get the value of SpreadInitialCount.
      Returns:
        Value of SpreadInitialCount.

    - #### setSpreadInitialCount

          public void setSpreadInitialCount(boolean newSpreadInitialCount)

      Set the value of SpreadInitialCount.
      Parameters:
        `newSpreadInitialCount` - Value to assign to SpreadInitialCount.

    - #### listOptions

          public java.util.Enumeration<Option> listOptions()

      Lists the command-line options for this classifier.
      Specified by:
        `listOptions` in interface `OptionHandler`
      Overrides:
        `listOptions` in class `AbstractClassifier`
      Returns:
        an enumeration over all commandline options

    - #### getOptions

          public java.lang.String[] getOptions()

      Gets options from this classifier.
      Specified by:
        `getOptions` in interface `OptionHandler`
      Overrides:
        `getOptions` in class `AbstractClassifier`
      Returns:
        the options for the current setup

    - #### setOptions

          public void setOptions(java.lang.String[] options)
                          throws java.lang.Exception

      Parses a given list of options.

      Valid options are:

           -M <minimum number of instances>
            Set minimum number of instances per leaf (default 2).

           -V <minimum variance for split>
            Set minimum numeric class variance proportion
            of train variance for split (default 1e-3).

           -N <number of folds>
            Number of folds for reduced error pruning (default 3).

           -S <seed>
            Seed for random data shuffling (default 1).

           -P
            No pruning.

           -L
            Maximum tree depth (default -1, no maximum)

      Specified by:
        `setOptions` in interface `OptionHandler`
      Overrides:
        `setOptions` in class `AbstractClassifier`
      Parameters:
        `options` - the list of options as an array of strings
      Throws:
        `java.lang.Exception` - if an option is not supported

    - #### numNodes

          public int numNodes()

      Computes size of the tree.
      Returns:
        the number of nodes

    - #### enumerateMeasures

          public java.util.Enumeration<java.lang.String> enumerateMeasures()

      Returns an enumeration of the additional measure names.
      Specified by:
        `enumerateMeasures` in interface `AdditionalMeasureProducer`
      Returns:
        an enumeration of the measure names

    - #### getMeasure

          public double getMeasure(java.lang.String additionalMeasureName)

      Returns the value of the named measure.
      Specified by:
        `getMeasure` in interface `AdditionalMeasureProducer`
      Parameters:
        `additionalMeasureName` - the name of the measure to query for its value
      Returns:
        the value of the named measure
      Throws:
        `java.lang.IllegalArgumentException` - if the named measure is not supported

    - #### getCapabilities

          public Capabilities getCapabilities()

      Returns default capabilities of the classifier.
      Specified by:
        `getCapabilities` in interface `Classifier`
      Specified by:
        `getCapabilities` in interface `CapabilitiesHandler`
      Overrides:
        `getCapabilities` in class `AbstractClassifier`
      Returns:
        the capabilities of this classifier
      See Also:
        `Capabilities`

    - #### buildClassifier

          public void buildClassifier(Instances data)
                               throws java.lang.Exception

      Builds classifier.
      Specified by:
        `buildClassifier` in interface `Classifier`
      Parameters:
        `data` - the data to train with
      Throws:
        `java.lang.Exception` - if building fails

    - #### distributionForInstance

          public double[] distributionForInstance(Instance instance)
                                           throws java.lang.Exception

      Computes class distribution of an instance using the tree.
      Specified by:
        `distributionForInstance` in interface `Classifier`
      Overrides:
        `distributionForInstance` in class `AbstractClassifier`
      Parameters:
        `instance` - the instance to compute the distribution for
      Returns:
        the computed class probabilities
      Throws:
        `java.lang.Exception` - if computation fails

    - #### toSource

          public java.lang.String toSource(java.lang.String className)
                                    throws java.lang.Exception

      Returns the tree as if-then statements.
      Specified by:
        `toSource` in interface `Sourcable`
      Parameters:
        `className` - the name for the generated class
      Returns:
        the tree as a Java if-then type statement
      Throws:
        `java.lang.Exception` - if something goes wrong

    - #### graphType

          public int graphType()

      Returns the type of graph this classifier represents.
      Specified by:
        `graphType` in interface `Drawable`
      Returns:
        Drawable.TREE

    - #### graph

          public java.lang.String graph()
                                 throws java.lang.Exception

      Outputs the decision tree as a graph
      Specified by:
        `graph` in interface `Drawable`
      Returns:
        the tree as a graph
      Throws:
        `java.lang.Exception` - if generation fails

    - #### toString

          public java.lang.String toString()

      Outputs the decision tree.
      Overrides:
        `toString` in class `java.lang.Object`
      Returns:
        a string representation of the classifier

    - #### generatePartition

          public void generatePartition(Instances data)
                                 throws java.lang.Exception

      Builds the classifier to generate a partition.
      Specified by:
        `generatePartition` in interface `PartitionGenerator`
      Throws:
        `java.lang.Exception`

    - #### getMembershipValues

          public double[] getMembershipValues(Instance instance)
                                       throws java.lang.Exception

      Computes array that indicates node membership. Array locations are allocated based on breadth-first exploration of the tree.
      Specified by:
        `getMembershipValues` in interface `PartitionGenerator`
      Throws:
        `java.lang.Exception`

    - #### numElements

          public int numElements()
                          throws java.lang.Exception

      Returns the number of elements in the partition.
      Specified by:
        `numElements` in interface `PartitionGenerator`
      Throws:
        `java.lang.Exception`

    - #### getRevision

          public java.lang.String getRevision()

      Returns the revision string.
      Specified by:
        `getRevision` in interface `RevisionHandler`
      Overrides:
        `getRevision` in class `AbstractClassifier`
      Returns:
        the revision

    - #### main

          public static void main(java.lang.String[] argv)

      Main method for this class.
      Parameters:
        `argv` - the commandline options