Re: CSE471 HW4 q1.3

[Subbarao Kambhampati <rao@asu.edu>]

Yes, you have to show the mutex computation with the planning graph
too.

Slide 10 was written in the context of planning graph without any
mutexes. when you ahve mutexes, putting an action whose preconditions
are mutex basically makes no sense since we knwo that the effects of
that action can never hold in the next level anyway.

rao


From: Brad <bjb@asu.edu>
Subject: CSE471 HW4 q1.3
Date: Mon, 26 Nov 2001 14:32:38 -0700 (MST)
Message-ID: <Pine.GSO.4.21.0111261425490.4502-100000@general2.asu.edu>

bjb> Are we supposed to draw mutex links to are planning graph?  I am a little
bjb> confused because it does not say to do that in the problem description and
bjb> this statement:
bjb> >* In question 3 (making the planning graph), can action O4 be added in the A1
bjb> >stage, where its preconditions (R & S) are mutex?  In general, can an action
bjb> >be added to the planning graph in a stage where any/all of its preconditions
bjb> >are mutex?
bjb> 
bjb> rao>There is no point in adding such actions...
bjb> 
bjb> seems to contradict the instructions for creating a planning graph on slide 10
bjb> of the planning lecture notes.  Now I am confused because even if I remove Op4
bjb> from the second action level I still get two consecutive identical
bjb> proposition lists and the planning graph levels off, so what is the
bjb> differance?
bjb> 
bjb> Bradford J. Bensen
bjb> Computer Science - Undergraduate
bjb> ASU - Engineering & Applied Sciences
bjb> bjb@asu.edu
bjb>