ClassifierTree

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## weka.classifiers.trees.j48
Class ClassifierTree

    java.lang.Object
      weka.classifiers.trees.j48.ClassifierTree

All Implemented Interfaces:
  java.io.Serializable, CapabilitiesHandler, Drawable, RevisionHandler

Direct Known Subclasses:
  C45PruneableClassifierTree, C45PruneableClassifierTreeG, NBTreeClassifierTree, PruneableClassifierTree

    public class ClassifierTree

extends java.lang.Object
implements Drawable, java.io.Serializable, CapabilitiesHandler, RevisionHandler

Class for handling a tree structure used for classification.

Version:
  $Revision: 1.22 $
Author:
  Eibe Frank (eibe@cs.waikato.ac.nz)
See Also:
  Serialized Form

Field Summary

Fields inherited from interface weka.core.Drawable
`BayesNet, NOT_DRAWABLE, TREE`

Constructor Summary
`ClassifierTree(ModelSelection toSelectLocModel)` Constructor.

Method Summary
`int` | `assignIDs(int lastID)` Assigns a uniqe id to every node in the tree.
`void` | `buildClassifier(Instances data)` Method for building a classifier tree.
`void` | `buildTree(Instances data, boolean keepData)` Builds the tree structure.
`void` | `buildTree(Instances train, Instances test, boolean keepData)` Builds the tree structure with hold out set
`double` | `classifyInstance(Instance instance)` Classifies an instance.
`void` | `cleanup(Instances justHeaderInfo)` Cleanup in order to save memory.
`double[]` | `distributionForInstance(Instance instance, boolean useLaplace)` Returns class probabilities for a weighted instance.
`Capabilities` | `getCapabilities()` Returns default capabilities of the classifier tree.
`java.lang.String` | `getRevision()` Returns the revision string.
`java.lang.String` | `graph()` Returns graph describing the tree.
`int` | `graphType()` Returns the type of graph this classifier represents.
`int` | `numLeaves()` Returns number of leaves in tree structure.
`int` | `numNodes()` Returns number of nodes in tree structure.
`java.lang.String` | `prefix()` Returns tree in prefix order.
`java.lang.StringBuffer[]` | `toSource(java.lang.String className)` Returns source code for the tree as an if-then statement.
`java.lang.String` | `toString()` Prints tree structure.

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

Constructor Detail

### ClassifierTree

    public ClassifierTree(ModelSelection toSelectLocModel)

  Constructor.

Method Detail

### getCapabilities

    public Capabilities getCapabilities()

  Returns default capabilities of the classifier tree.

  Specified by:
    `getCapabilities` in interface `CapabilitiesHandler`
  Returns:
    the capabilities of this classifier tree
  See Also:
    `Capabilities`

### buildClassifier

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

  Method for building a classifier tree.

  Parameters:
    `data` - the data to build the tree from
  Throws:
    `java.lang.Exception` - if something goes wrong

### buildTree

    public void buildTree(Instances data,
                          boolean keepData)
                   throws java.lang.Exception

  Builds the tree structure.

  Parameters:
    `data` - the data for which the tree structure is to be generated.
    `keepData` - is training data to be kept?
  Throws:
    `java.lang.Exception` - if something goes wrong

### buildTree

    public void buildTree(Instances train,
                          Instances test,
                          boolean keepData)
                   throws java.lang.Exception

  Builds the tree structure with hold out set

  Parameters:
    `train` - the data for which the tree structure is to be generated.
    `test` - the test data for potential pruning
    `keepData` - is training Data to be kept?
  Throws:
    `java.lang.Exception` - if something goes wrong

### classifyInstance

    public double classifyInstance(Instance instance)
                            throws java.lang.Exception

  Classifies an instance.

  Parameters:
    `instance` - the instance to classify
  Returns:
    the classification
  Throws:
    `java.lang.Exception` - if something goes wrong

### cleanup

    public final void cleanup(Instances justHeaderInfo)

  Cleanup in order to save memory.

  Parameters:
    `justHeaderInfo` -

### distributionForInstance

    public final double[] distributionForInstance(Instance instance,
                                                  boolean useLaplace)
                                           throws java.lang.Exception

  Returns class probabilities for a weighted instance.

  Parameters:
    `instance` - the instance to get the distribution for
    `useLaplace` - whether to use laplace or not
  Returns:
    the distribution
  Throws:
    `java.lang.Exception` - if something goes wrong

### assignIDs

    public int assignIDs(int lastID)

  Assigns a uniqe id to every node in the tree.

  Parameters:
    `lastID` - the last ID that was assign
  Returns:
    the new current ID

### 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

  Returns graph describing the tree.

  Specified by:
    `graph` in interface `Drawable`
  Returns:
    the tree as graph
  Throws:
    `java.lang.Exception` - if something goes wrong

### prefix

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

  Returns tree in prefix order.

  Returns:
    the prefix order
  Throws:
    `java.lang.Exception` - if something goes wrong

### toSource

    public java.lang.StringBuffer[] toSource(java.lang.String className)
                                      throws java.lang.Exception

  Returns source code for the tree as an if-then statement. The class is assigned to variable "p", and assumes the tested instance is named "i". The results are returned as two stringbuffers: a section of code for assignment of the class, and a section of code containing support code (eg: other support methods).

  Parameters:
    `className` - the classname that this static classifier has
  Returns:
    an array containing two stringbuffers, the first string containing assignment code, and the second containing source for support code.
  Throws:
    `java.lang.Exception` - if something goes wrong

### numLeaves

    public int numLeaves()

  Returns number of leaves in tree structure.

  Returns:
    the number of leaves

### numNodes

    public int numNodes()

  Returns number of nodes in tree structure.

  Returns:
    the number of nodes

### toString

    public java.lang.String toString()

  Prints tree structure.

  Overrides:
    `toString` in class `java.lang.Object`
  Returns:
    the tree structure

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Returns:
    the revision

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