5:23 p.m.
Hi,
I am new to Drools. I read the documentation and I looked at the examples,
but I still not sure how to solve this problem:
1) Kind: iterative diagnosis
Rules:
if (A, B and C) then print ("Solution 1")
if (A, B and not C) then print ("Solution 2")
if (A, D and E) then print ("Solution 3")
and so on...
The entry should be something like this:
* no facts are know
* user answers a question (lets say A = true), I update the Statefull
session and fire the rules
* system chooses a unknow fact based on condition for the best incomplete
rule. In this case, it would be B (as it knows A, but it doesn't know B or
C)
* user answers a new question (B = false), I update the session + fireRules
* system now knows that rule 1 (A, B and C) is not possible. It also knows
that rule 2 (A, B and not C) is not possible. So, it chooses the second
condition on rule 3 (A, D and E), which is: what is D?
* user answers a new question (D = true)
....
* user answers a new question (E= true)
* system prints: Solution 3!
My big question: can I extract from the working memory or rule manager or
the agenda a list of the rules that are 'almost' good to fire, but that
still requires some of its conditions to be know (by inserting facts)?
Thanks!
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3:24 a.m.
As an answer to your "big" question: no. There is no distinction between a
rule that isn't activated because one of its patterns doesn't match with any
of the existing facts or due to the absence of facts of a type. Hence, (A, B
and not C) with A, B and C that does not match is indistinguishable from A,
B and no C at all.
Are all your facts booleans or simple (integer, enum,...) values? "Answer to
question" seems to indicate this.
Note that there are rules (boolean expressions) determining a "solutiion"
and rules governing data acquisition. I'd try and model the second group,
possibly based on facts representing the individual "solution", what is
required to reach them, how much has been required, whether one is still
feasible, etc.
"Decision tree" seems to be the thing you need, but Drools doesn't have
this
out of the box.
-W
On 21 August 2011 00:23, Kal <kalarhan(a)gmail.com> wrote:
Hi,
I am new to Drools. I read the documentation and I looked at the examples,
but I still not sure how to solve this problem:
1) Kind: iterative diagnosis
Rules:
if (A, B and C) then print ("Solution 1")
if (A, B and not C) then print ("Solution 2")
if (A, D and E) then print ("Solution 3")
and so on...
The entry should be something like this:
* no facts are know
* user answers a question (lets say A = true), I update the Statefull
session and fire the rules
* system chooses a unknow fact based on condition for the best incomplete
rule. In this case, it would be B (as it knows A, but it doesn't know B or
C)
* user answers a new question (B = false), I update the session + fireRules
* system now knows that rule 1 (A, B and C) is not possible. It also knows
that rule 2 (A, B and not C) is not possible. So, it chooses the second
condition on rule 3 (A, D and E), which is: what is D?
* user answers a new question (D = true)
....
* user answers a new question (E= true)
* system prints: Solution 3!
My big question: can I extract from the working memory or rule manager or
the agenda a list of the rules that are 'almost' good to fire, but that
still requires some of its conditions to be know (by inserting facts)?
Thanks!
--
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7:22 a.m.
Thank you for the reply Wolfgang!
Altho this particular application involves a Expert System, I quite enjoyed
learning about drools and I intend to keep studying it in the following
months regardless if I end up using it or not right now.
A solution (far from ideal) that I came up with was to 'explode' my rules,
something like this:
/Group A:
RULE: if ~A, solution is: "text here 1"
RULE: if A => ask B1
Group B:
RULE: if A,~B1 => ask C1
RULE: if A, B1 => ask B2
RULE: if A, B1, B2 => ask B3
RULE: if A, B1, ~B2 => solution is: "text here 2"
RULE: if A, B1, B2, B3 ou ~B3 => ask B4
RULE: if A, B1, B2, B3, B4 => solution is: "text here 3"
RULE: if A, B1, B2, B3, ~B4 => solution is: "text here 4"
RULE: if A, B1, B2, ~B3, B4 => solution is: "text here 5"
RULE: if A, B1, B2, ~B3, ~B4 => solution is: "text here 6"
Group C:
RULE: if A, ~C1 => ask D1
....
Groups D, E, F, G, .../
But that would means that a small sample with ~25 rules would have to be
'exploded' into ~50+ rules. The ASK command would represent a call to the
end user and it would be followed by a new Fact and fireRules.
Please note that a small sample with 25 rules has about 15 variables/facts
and altho I have one general goal: "is it a problem or not?", there are
about 17 unique answers (e.g: yes it is a problem, so do this.... to solve
it).
With that in mind, I think that using a rules system like drools would be
perfect to keep my application simple to maintain and to expand later ... a
complete solution would involve more goals, maybe 200-300 rules.
Any suggestions on how to use Drools or other solution would be greatly
appreciated.
Thanks!
Kal
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Wolfgang Laun