Class SumOfClusterVariances
- java.lang.Object
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- org.apache.commons.math4.legacy.ml.clustering.evaluation.SumOfClusterVariances
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- All Implemented Interfaces:
ClusterEvaluator
public class SumOfClusterVariances extends Object implements ClusterEvaluator
Computes the sum of intra-cluster distance variances according to the formula:\( score = \sum\limits_{i=1}^n \sigma_i^2 \)where n is the number of clusters and \( \sigma_i^2 \) is the variance of intra-cluster distances of cluster \( c_i \).- Since:
- 3.3
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Constructor Summary
Constructors Constructor Description SumOfClusterVariances(DistanceMeasure measure)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description booleanisBetterScore(double a, double b)Provides a means to interpret thescore value.doublescore(List<? extends Cluster<? extends Clusterable>> clusters)
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Constructor Detail
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SumOfClusterVariances
public SumOfClusterVariances(DistanceMeasure measure)
- Parameters:
measure- Distance measure.
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Method Detail
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score
public double score(List<? extends Cluster<? extends Clusterable>> clusters)
- Specified by:
scorein interfaceClusterEvaluator- Parameters:
clusters- List of clusters.- Returns:
- the score attributed by the evaluator.
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isBetterScore
public boolean isBetterScore(double a, double b)
Provides a means to interpret thescore value.- Specified by:
isBetterScorein interfaceClusterEvaluator- Parameters:
a- Score computed by this evaluator.b- Score computed by this evaluator.- Returns:
trueif the evaluator considers that scoreais better than scoreb.
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