Machine Learning Platforms in 2021

How many machine learning platforms run on Kubernetes? Which machine learning platforms can run in air-gapped environments? How common are feature stores in current machine learning platforms? There are many commercial and open-source machine learning platforms on the market today. While Gartner's Magic Quadrants and Forrester's Waves can inform, these views onto the marketplace are not neutral: they are based on vendor demonstrations and customer surveys rather than hands-on software evaluations or in-depth studies of available documentation.