Source: A high performance implementation of HDBSCAN clustering.
http://hdbscan.readthedocs.io/en/latest/ Copyright (c) 2015, Leland McInnes;
https://github.com/scikit-learn-contrib/hdbscan/blob/master/notebooks/clusterable_data.npy

`labels0` generated by M. Gagolewski.

`0` denotes the noise class.
