Typo. Fix on re-post

Need to fix this link. Correct link is http://www.differencebetween.com/difference-between-classification-and-vs-regression

Clarify: A character sketch is not a drawing but a piece of writing. See https://www.scribendi.com/advice/how_to_write_a_character_sketch.en.html

General documentation on Jupyter Notebooks and how to view them statically on Github or download and run them locally might be helpful here.

Could this be visualized as a heatmap?

See https://arxiv.org/abs/1512.00728