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Class weka.classifiers.adtree.Splitter

java.lang.Object
    |
    +----weka.classifiers.adtree.Splitter

public abstract class Splitter
extends java.lang.Object
implements java.io.Serializable, java.lang.Cloneable
Abstract class representing a splitter node in an alternating tree.

Version:
$Revision: 1.1 $
Author:
Richard Kirkby (rkirkby@cs.waikato.ac.nz)

Variable Index

 o orderAdded
The number this node was in the order of nodes added to the tree

Constructor Index

 o Splitter()
 

Method Index

 o attributeString(Instances)
Gets the string describing the attributes the split depends on.
 o branchInstanceGoesDown(Instance)
Gets the index of the branch that an instance applies to.
 o clone()
Clones this node.
 o comparisonString(int, Instances)
Gets the string describing the comparision the split depends on for a particular branch.
 o equalTo(Splitter)
Tests whether two splitters are equivalent.
 o getChildForBranch(int)
Gets the child for a branch of the split.
 o getNumOfBranches()
Gets the number of branches of the split.
 o instancesDownBranch(int, Instances)
Gets the subset of instances that apply to a particluar branch of the split.
 o setChildForBranch(int, PredictionNode)
Sets the child for a branch of the split.

Field Detail

 o orderAdded
public int orderAdded
          The number this node was in the order of nodes added to the tree

Constructor Detail

 o Splitter
public Splitter()

Method Detail

 o getNumOfBranches
public abstract int getNumOfBranches()
          Gets the number of branches of the split.
Returns:
the number of branches
 o branchInstanceGoesDown
public abstract int branchInstanceGoesDown(Instance i)
          Gets the index of the branch that an instance applies to. Returns -1 if no branches apply.
Parameters:
i - the instance
Returns:
the branch index
 o instancesDownBranch
public abstract ReferenceInstances instancesDownBranch(int branch,
                                                       Instances sourceInstances)
          Gets the subset of instances that apply to a particluar branch of the split. If the branch index is -1, the subset will consist of those instances that don't apply to any branch.
Parameters:
branch - the index of the branch
sourceInstances - the instances from which to find the subset
Returns:
the set of instances that apply
 o attributeString
public abstract java.lang.String attributeString(Instances dataset)
          Gets the string describing the attributes the split depends on. i.e. the left hand side of the description of the split.
Parameters:
dataset - the dataset that the split is based on
Returns:
a string describing the attributes
 o comparisonString
public abstract java.lang.String comparisonString(int branchNum,
                                        Instances dataset)
          Gets the string describing the comparision the split depends on for a particular branch. i.e. the right hand side of the description of the split.
Parameters:
branchNum - the branch of the split
dataset - the dataset that the split is based on
Returns:
a string describing the comparison
 o equalTo
public abstract boolean equalTo(Splitter compare)
          Tests whether two splitters are equivalent.
Parameters:
compare - the splitter to compare with
Returns:
whether or not they match
 o setChildForBranch
public abstract void setChildForBranch(int branchNum,
                                       PredictionNode childPredictor)
          Sets the child for a branch of the split.
Parameters:
branchNum - the branch to set the child for
childPredictor - the new child
 o getChildForBranch
public abstract PredictionNode getChildForBranch(int branchNum)
          Gets the child for a branch of the split.
Parameters:
branchNum - the branch to get the child for
Returns:
the child
 o clone
public abstract java.lang.Object clone()
          Clones this node. Performs a deep copy, recursing through the tree.
Returns:
a clone

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