진짜 없는게 없다 https://github.com/jingtt/varclushi 출처 : https://datascience.stackexchange.com/questions/97908/k-means-clustering-over-columns-not-rows

https://www.researchgate.net/publication/259184407_Product_Affinity_Segmentation_Using_the_Doughnut_Clustering_Approach