Temporarily fix euclidean metric to test speedups; fix bug that allowed cycles.
Temporarily fix euclidean metric to test speedups; fix bug that allowed cycles.

scikit-learn-contrib/hdbscan,brunoalano/hdbscan,scikit-learn-contrib/hdbscan,lmcinnes/hdbscan,brunoalano/hdbscan,c-north/hdbscan,lmcinnes/hdbscan