How to get sub-clusters or super-cluster of a cluster?

[JunFang-NWPU]

Hi,

I obtained some clusters using hdbscan. Some clusters contain too many points, and some contain too little. I know I can find sub-clusters or super-cluster of a cluster from its hierarchy (e.g., condense_tree), but it seems it is not an easy task.

Can someone show how to achieve it? Input a cluster label, and found its sub-clusters and super-cluster.

Thanks.

[lmcinnes]

You need to get a mapping from cluster labels as output to ids in the condensed tree. From there is is just a matter of following the tree (finding a parent that has this node as a child, or looking at the children on this node). If you look through the code of get_clusters in hdbscan.plots you can see one approach to getting this sort of label mapping.

[JunFang-NWPU]

Yes, the key is the mapping from labesl to ids in the condensed tree. Thanks. I will give a try.

[salman1993]

@lmcinnes would you please be able to share a small snippet that does this? it would be super helpful! 🙏🏽

there are a few open issues regarding this cluster mapping and sub cluster topic - https://github.com/scikit-learn-contrib/hdbscan/issues/451, https://github.com/scikit-learn-contrib/hdbscan/issues/442