[lmcinnes]

It is worth noting that scikit-learn does value clear understandable implementations, so you can actually pop open the source code and expect to find something other than a black box. Now, in many cases you'll have optimization work that means a slightly less obvious approach is taken, but the scikit-learn maintainers do work hard to try and ensure that, if you want to learn, you should be able to open up the code and do so.