Machine Learning, Education, Scikit Learn, Unsupervised Learning, Clustering.
similarity of the two splits of the same sample. In order for this index to be close to zero for any clustering outcomes with any n and number of clusters, it is essential to scale it, hence the Adjusted Rand Index: ARI = (RI — E(RI))/(max(RI) — E(RI)). This metric is symmetric and does not depend