obtainDataToFusionLittleCluster
obtainEveryFeaturesCombinations
obtainInputDataClustering
obtainInternalsIndicesVecto
obtainOccurencePerFeature
obtainRandomlyBucketizedFeatures
obtainSortedClusterizedData
occurencesPerFeatureByClusterID
occurencesPerFeatureByClusteringNumber
occurencesRatioPerFeatureByClusterID