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Some AI Koans

http://www.catb.org/~esr/jargon/html/koans.html

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Some AI Koans

Tom Knight and the Lisp Machine

Moon instructs a student

Sussman attains enlightenment

Drescher and the toaster

These are some of the funniest examples of a genre of jokes told at the MIT AI

Lab about various noted hackers. The original koans were composed by Danny

Hillis, who would later found Connection Machines, Inc. In reading these, it is

at least useful to know that Minsky, Sussman, and Drescher are AI researchers

of note, that Tom Knight was one of the Lisp machine's principal designers, and

that David Moon wrote much of Lisp Machine Lisp.

Tom Knight and the Lisp Machine

A novice was trying to fix a broken Lisp machine by turning the power off and

on.

Knight, seeing what the student was doing, spoke sternly: β€œYou cannot fix a

machine by just power-cycling it with no understanding of what is going wrong.”

Knight turned the machine off and on.

The machine worked.

Moon instructs a student

One day a student came to Moon and said: β€œI understand how to make a better

garbage collector. We must keep a reference count of the pointers to each cons.

”

Moon patiently told the student the following story:

β€œOne day a student came to Moon and said: β€˜I understand how to make a

better garbage collector...

[Ed. note: Pure reference-count garbage collectors have problems with circular

structures that point to themselves.]

Sussman attains enlightenment

In the days when Sussman was a novice, Minsky once came to him as he sat

hacking at the PDP-6.

β€œWhat are you doing?”, asked Minsky.

β€œI am training a randomly wired neural net to play Tic-Tac-Toe” Sussman

replied.

β€œWhy is the net wired randomly?”, asked Minsky.

β€œI do not want it to have any preconceptions of how to play”, Sussman said.

Minsky then shut his eyes.

β€œWhy do you close your eyes?”, Sussman asked his teacher.

β€œSo that the room will be empty.”

At that moment, Sussman was enlightened.

Drescher and the toaster

A disciple of another sect once came to Drescher as he was eating his morning

meal.

β€œI would like to give you this personality test”, said the outsider, β€œbecause I

want you to be happy.”

Drescher took the paper that was offered him and put it into the toaster,

saying: β€œI wish the toaster to be happy, too.”

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