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## weka.classifiers.trees.ft
Class FTNode

    java.lang.Object
      weka.classifiers.Classifier
          weka.classifiers.trees.lmt.LogisticBase
              weka.classifiers.trees.ft.FTtree
                  weka.classifiers.trees.ft.FTNode

All Implemented Interfaces:
  java.io.Serializable, java.lang.Cloneable, CapabilitiesHandler, OptionHandler, RevisionHandler, WeightedInstancesHandler

    public class FTNode

extends FTtree

Class for Functional tree structure.

Version:
  $Revision: 1.4 $
Author:
  Jo\~{a}o Gama, Carlos Ferreira
See Also:
  Serialized Form

Constructor Summary
`FTNode(boolean errorOnProbabilities, int numBoostingIterations, int minNumInstances, double weightTrimBeta, boolean useAIC)` Constructor for Functional tree node.

Method Summary
`void` | `buildClassifier(Instances data)` Method for building a Functional tree (only called for the root node).
`void` | `buildTree(Instances data, SimpleLinearRegression[][] higherRegressions, double totalInstanceWeight, double higherNumParameters)` Method for building the tree structure.
`double[]` | `distributionForInstance(Instance instance)` Returns the class probabilities for an instance given by the Functional Tree.
`java.lang.String` | `getRevision()` Returns the revision string.
`double` | `prune()` Method for prunning a tree using C4.5 pruning procedure.

Methods inherited from class weka.classifiers.trees.ft.FTtree
`assignIDs, assignLeafModelNumbers, cleanup, getConstError, getModelParameters, getNodes, getNodes, getNumInnerNodes, getNumLeaves, graph, hasModels, modelDistributionForInstance, modelsToString, numLeaves, numNodes, toString`

Methods inherited from class weka.classifiers.trees.lmt.LogisticBase
`getMaxIterations, getNumRegressions, getUseAIC, getUsedAttributes, getWeightTrimBeta, percentAttributesUsed, setHeuristicStop, setMaxIterations, setUseAIC, setWeightTrimBeta`

Methods inherited from class weka.classifiers.Classifier
`classifyInstance, debugTipText, forName, getCapabilities, getDebug, getOptions, listOptions, makeCopies, makeCopy, setDebug, setOptions`

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

Constructor Detail

### FTNode

    public FTNode(boolean errorOnProbabilities,
                  int numBoostingIterations,
                  int minNumInstances,
                  double weightTrimBeta,
                  boolean useAIC)

  Constructor for Functional tree node.

  Parameters:
    `errorOnProbabilities` - Use error on probabilities for stopping criterion of LogitBoost?
    `numBoostingIterations` - sets the numBoostingIterations parameter
    `minNumInstances` - minimum number of instances at which a node is considered for splitting

Method Detail

### buildClassifier

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

  Method for building a Functional tree (only called for the root node). Grows an initial Functional Tree.

  Specified by:
    `buildClassifier` in class `FTtree`
  Parameters:
    `data` - the data to train with
  Throws:
    `java.lang.Exception` - if something goes wrong

### buildTree

    public void buildTree(Instances data,
                          SimpleLinearRegression[][] higherRegressions,
                          double totalInstanceWeight,
                          double higherNumParameters)
                   throws java.lang.Exception

  Method for building the tree structure. Builds a logistic model, splits the node and recursively builds tree for child nodes.

  Specified by:
    `buildTree` in class `FTtree`
  Parameters:
    `data` - the training data passed on to this node
    `higherRegressions` - An array of regression functions produced by LogitBoost at higher levels in the tree. They represent a logistic regression model that is refined locally at this node.
    `totalInstanceWeight` - the total number of training examples
    `higherNumParameters` - effective number of parameters in the logistic regression model built in parent nodes
  Throws:
    `java.lang.Exception` - if something goes wrong

### prune

    public double prune()
                 throws java.lang.Exception

  Method for prunning a tree using C4.5 pruning procedure.

  Specified by:
    `prune` in class `FTtree`
  Throws:
    `java.lang.Exception` - if something goes wrong

### distributionForInstance

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

  Returns the class probabilities for an instance given by the Functional Tree.

  Specified by:
    `distributionForInstance` in class `FTtree`
  Parameters:
    `instance` - the instance
  Returns:
    the array of probabilities
  Throws:
    `java.lang.Exception` - if distribution can't be computed successfully

### getRevision

    public java.lang.String getRevision()

  Returns the revision string.

  Specified by:
    `getRevision` in interface `RevisionHandler`
  Overrides:
    `getRevision` in class `FTtree`
  Returns:
    the revision

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