AI koan

humour /A-I koh'an/ One of a series of pastiches of Zen

teaching riddles created by Danny Hillis at the MIT AI Lab

around various major figures of the Lab's culture.

See also ha ha only serious, mu.

In reading these, it is at least useful to know that MarvinMinsky, Gerald 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.

* * *

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: "You

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.

* * *

One day a student came to Moon and said: "I 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:

"One day a student came to Moon and said: `I understand

how to make a better garbage collector...

[Pure reference-count garbage collectors have problems with

circular structures that point to themselves.]

* * *

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

as he sat hacking at the PDP-6.

"What are you doing?", asked Minsky.

"I am training a randomly wired neural net to play

Tic-Tac-Toe", Sussman replied.

"Why is the net wired randomly?", asked Minsky.

"I do not want it to have any preconceptions of how to play",

Sussman said.

Minsky then shut his eyes.

"Why do you close your eyes?", Sussman asked his teacher.

"So that the room will be empty."

At that moment, Sussman was enlightened.

* * *

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

eating his morning meal.

"I would like to give you this personality test", said the

outsider, "because I want you to be happy."

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

the toaster, saying: "I wish the toaster to be happy, too."

(1995-02-08)