The advocates of machine learning are known to be a fiercely contentious lot, each asserting that its own approach is superior to all others, and that any evidence adduced to the contrary is propaganda, fake news of the worst sort, stemming from jealous advocates of inferior approaches. The closest approximation to the internecine warfare of the machine learning field is the human learning field, in which advocates of public, government-run and union-staffed schools exchange harsh words with advocates of charter schools, with a level of invective and passion that indicates that someone is strongly in favor of hopelessly uneducated machines and/or humans.

A purposely vague term, referring to an ever-growing set of tools and techniques, that are said to do stuff that people usually do, only better. AI programs have advanced from early victories in playing checkers to wins against chess masters. They have finally achieved the pinnacle of human intelligence, winning the game show Jeopardy. After decades of marching from success to success, today's leaders of Artificial Intelligence anticipate that practical applications of the technology are certain to emerge. If not, they threaten to further inflate the definition of Artificial Intelligence to encompass normal computer programs written by ordinary human beings, at which point success will be theirs -- since a computer program is, without doubt, artificial.