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Class weka.classifiers.m5.Impurity
java.lang.Object
|
+----weka.classifiers.m5.Impurity
- public final class Impurity
- extends java.lang.Object
Class for handling the impurity values when spliting the instances
- Version:
- $Revision: 1.4 $
- Author:
- Yong Wang (yongwang@cs.waikato.ac.nz)
Impurity(int, int, Instances, int)
- Constructs an Impurity object containing the impurity values of partitioning the instances using an attribute
incremental(double, int)
- Incrementally computes the impurirty values
toString()
- Converts an Impurity object to a string
Impurity
public Impurity(int partition,
int attribute,
Instances inst,
int k)
Constructs an Impurity object containing the impurity values of partitioning the instances using an attribute
- Parameters:
partition
- the index of the last instance in the left subset
attribute
- the attribute used in partitioning
inst
- instances
k
- the order of the impurity; =1, the variance; =2, the stardard deviation; =k, the k-th order root of the variance
toString
public final java.lang.String toString()
Converts an Impurity object to a string
- Returns:
- the converted string
- Overrides:
- toString in class java.lang.Object
incremental
public final void incremental(double value,
int type)
Incrementally computes the impurirty values
- Parameters:
value
- the incremental value
type
- if type=1, value will be added to the left subset; type=-1, to the right subset; type=0, initializes
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