[rules-users] Re: drools-solver (initialization and starting score)
With kind regards,
Geoffrey De Smet
Andrew Waterman schreef:
Hi,
I've been looking through my solver logs and on a problem i have posed,
the solver seems to first initialize and setup a best score:
INFO: Initialization time spend (3) for score (-5000004.0). Updating
best solution and best score.
However, this score is not correct. I use collect to load Tokens of a
certain type for my game, and those that are found, penalize the system
with a constraint:
rule "Too much unclaimed territory"
when
$list : ArrayList ( size > 2) from collect (
Token ($type : type == TokenType.UNDEVELOPED))
then
for (int i = 0; i < $list.size(); i++) {
insertLogical (new IntConstraintOccurrence (
"Too much unclaimed territory",
ConstraintType.NEGATIVE_SOFT, 3, $list));
Doesn't this insert the same logical fact in a loop? So only 1 instance
actually remains in the working memory?
If you want to have to list.size() affect the score, just do:
3 * list.size()
}
end
Why use collect anyway?
when
$t1 : Token ($type : type == TokenType.UNDEVELOPED, id1 : id)
$t2 : Token ($type : type == TokenType.UNDEVELOPED, id > id1,
id2 : id)
$t3 : Token ($type : type == TokenType.UNDEVELOPED, id > id2,
id3 : id)
// maybe you need things like this: not Token ($type : type ==
TokenType.UNDEVELOPED, id > id3)
then
insertLogical (new IntConstraintOccurrence ("Too much unclaimed
territory", ConstraintType.NEGATIVE_SOFT, 3, $t1, $t2, $t3));
However, the initial score does not seem to account for these inserted
facts. Due to this, all improving solutions are rejected, and I see no
change in the solution the solver finds and my starting solution.
Any suggestions on how to delay initialization? Or get the starting
score to take into account this constraint (I've made it SOFT so the
values aren't so hard to follow in the logs, it was initially a HARD
constraint). I'd love to find a way around this problem, I've spent
most of the day playing with different configurations (acceptors and
foragers) trying to find a configuration that works for this base problem.
best wishes,
Andrew
---------------------------------
Andrew Waterman
San Cristóbal de las Casas, Chiapas, Mexico
+52 1 967 107 5902
+1 510 342 5693
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