https://news.ycombinator.com/item?id=5831512
Here are some other resources for machine learning, not necessarily restricted to the algorithms implemented in SciKit:
http://eferm.com/wp-content/uploads/2011/05/cheat3.pdf
http://peekaboo-vision.blogspot.ca/2013/01/machine-learning-...
http://rise.cse.iitm.ac.in/wiki/index.php/Introduction_to_Ma...
http://mlg.eng.cam.ac.uk/creed/Notes/ML_Compendium.pdf