I usually go with Davies-Bouldin index but there are a few methods: Python/Sklearn: https://scikit-learn.org/stable/modules/clustering.html#clustering-evaluati

I usually go with Davies-Bouldin index but there are a few methods: Python/Sklearn: https://scikit-learn.org/stable/modules/clustering.html#clustering-evaluation https://scikit-learn.org/stable/modules/clustering.html#clus... R: https://cran.r-hub.io/web/packages/clusterCrit/clusterCrit.pdf https://cran.r-hub.io/web/packages/clusterCrit/clusterCrit.p...