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elki-project / elki

ELKI Data Mining Toolkit
https://elki-project.github.io/
GNU Affero General Public License v3.0
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Clusters of size 0 (with HDBSCAN/DeLiClu/OPTICS) #48

Closed neilireson closed 5 years ago

neilireson commented 6 years ago

Perhaps this is related to https://github.com/elki-project/elki/issues/41 and therefore expected.

However my (naive) understanding is that for some of these algorithms (HDBSCAN) the cluster is defined by the enclosed data points. Therefore a zero sized cluster is meaningless.

kno10 commented 6 years ago

In a hierarchical result, a 0 element cluster can make perfect sense: it can have two non-empty child clusters (and you should always consider all child cluster members to be part of a cluster, too). Please check the hierarchy, too.

kno10 commented 6 years ago

Did this answer your question? Can I close the issue?