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- Date: Tue, 1 Sep 1992 16:28:45 PDT
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- From: Penni Sibun <sibun@PARC.XEROX.COM>
- Subject: Re: Agre's Cooking problem
- X-To: CSG-L%UIUCVMD.BITNET@pucc.princeton.edu
- In-Reply-To: "Jeffrey C. Hunter"'s message of Mon,
- 31 Aug 1992 19:07:15 -0700
- <92Aug31.190811pdt.11636@alpha.xerox.com>
- Lines: 56
-
- (ps 920901.1600)
-
- [From Jeff Hunter (920831)]
-
- This was (if you pardon the pun) a cooked example. None
- of the subtasks interfered with any other in any major way.
- To show why, here is an example of weekend goals:
-
- - wear sunhat
- - get new car tires
- - spend weekend at cottage
-
- And these are fed into Agre's weekend planner (main mechanism
- recapped below):
-
- i'm quite certain that neither agre nor horswill would dream of
- suggesting using toast for planning a weekend. (and *i* certainly
- wouldn't use a planner for my weekend!) is it unreasonable to assume
- that different sorts of activities can use different sorts of planning,
- in both the technical and the colloquial sense?
-
- Any decent planner can find the best ordering for these
- weekend goals in nearly the same time that Agre's one would
- find a lousy one.
-
- substantiation?
-
- The "planning weenies" have considered a lot of cases of
- conflicting tasks, and their work should not be discarded lightly.
-
- yes, the planning weenies have spent a lot of time worrying about
- subgoal conflicts (sometimes called ``goal clobbers brother goal'').
- one of agre's points is that usually you just don't have to worry
- about it. and making breakfast is (claimed to be) a good example of
- just that.
-
- I think I see why the planner died. At least part of it
- is that Toast is implicitly told that any pat of butter is the
- same as any other pat, whereas the SNLP planner was not.
- Why are there 15 pats of butter? Why so that the planner
- must consider more than 23 factorial orders of placing butter
- and eggs in the frypan.
-
- have you ever seen a kitchen w/ one pat of butter in it? in fact i
- bet you've never seen a kitchen w/ *any* pats of butter! i assume
- there are fifteen pats of butter becasue that's roughly what you'd get
- out of a stick and they didn't want to get into individuating the
- stick into pats so they assumed it came that way. i think both toast
- *and* the snlp would have a tough time simulating slicing off a piece
- of butter!
-
- De apibus semper dubitandum est. Winni Ille Pu
-
- ;-}
-
- --Penni
-