<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:10pt"><div><span>></span> That's comparing apples and oranges.</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">> If you have 2 solutions A and B scored using a different score
function, it's impossible to state whether A is better/worse than B
based on those scores or the number of violations.</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">Well the rules stay the same, only the weight is changed.</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">If I have for example a rule (R1) that requires a given skill for a job and a rule (R2) which says someone can only do one job at the time then</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family:
arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">Solution A) with different weights I get something like 20 violations of R1 and 10 violations of R2</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">Solution B) with equal weights I get something like 5 violations of R1 and 2 violations of R2</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">So B) is better.</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">I understand the fact that a business analysis defines the
weights, that's why they have been different so far.</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">1) I just don't know how to get to solution B (which is better than A if you recalculate with the weights of A) with the correct weights applied.</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">2) Can you indicate how hard it is to migrate from 5.5.0 to 6.0?</div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family: arial,helvetica,sans-serif; background-color: transparent; font-style: normal;"><br></div><div style="color: rgb(0, 0, 0); font-size: 13.3333px; font-family:
arial,helvetica,sans-serif; background-color: transparent; font-style: normal;">Thanks</div><div> </div><div>-----------------<br>http://www.codessentials.com - Your essential software, for free!<br>Follow us at http://twitter.com/#!/Codessentials<br></div> <div style="font-family: arial, helvetica, sans-serif; font-size: 10pt;"> <div style="font-family: times new roman, new york, times, serif; font-size: 12pt;"> <div dir="ltr"> <hr size="1"> <font face="Arial" size="2"> <b><span style="font-weight:bold;">From:</span></b> Geoffrey De Smet <ge0ffrey.spam@gmail.com><br> <b><span style="font-weight: bold;">To:</span></b> Michiel Vermandel <mvermand@yahoo.com>; Rules Users List <rules-users@lists.jboss.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, June 6, 2013 11:15 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [drools-planner] please advice on IntConstraintOccurrence weight<br>
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<div class="yiv2642368488moz-cite-prefix">On 06-06-13 10:22, Michiel Vermandel
wrote:<br>
</div>
<blockquote type="cite">
<div style="color:#000;background-color:#fff;font-family:arial, helvetica, sans-serif;font-size:10pt;">
<div><span>Hi,</span></div>
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;"><br>
</div>
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;">(using drools-planner
5.5.0.Final)</div>
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;"><br>
<span></span></div>
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;"><span>I'm struggling with
assigning weights to IntConstraintOccurrence in a rule's
LHS.</span></div>
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;"><span>If I assign different
weights for different rules (because we think one rule is
more important than an other)</span></div>
</div>
</blockquote>
The business analysis defines the score weights, it's not our call
to make which is more important etc.<br>
One way talk to you your business people and get them to convert
their knowledge into score weights<br>
is to ask "if you had to put a price tag on everything, how much
would violating this constraint cost us?".<br>
Basically normalize everything to a price.<br>
<br>
For example: in nurse rostering, "not giving a nurse her day off
requests costs the solution 100 $".<br>
It might seem unethical to put a price tag on a nurse's happiness,
but reality does it implicitly anyway.<br>
<br>
<blockquote type="cite">
<div style="color:#000;background-color:#fff;font-family:arial, helvetica, sans-serif;font-size:10pt;">
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;"><span> our end result is far
worse than when we assign all equal weights.</span></div>
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;"><span>I do not look at the
total value of hard and soft score but at the number of
violations.</span></div>
</div>
</blockquote>
That's comparing apples and oranges.<br>
If you have 2 solutions A and B scored using a different score
function, it's impossible to state whether A is better/worse than B
based on those scores or the number of violations.<br>
<br>
What you can do is take solution B and grind it through A's score
function to compare it with score A (or vica versa).<br>
<br>
<blockquote type="cite">
<div style="color:#000;background-color:#fff;font-family:arial, helvetica, sans-serif;font-size:10pt;">
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;"><span>I can imagine that the
planner can evolve much easier to a better solution with all
weights being the same because if not then "transient" moves
will be made impossible to take.</span></div>
</div>
</blockquote>
Yes, if and only if the more difficult constraints have higher
weights (otherwise it's the opposite).<br>
<br>
But it's a bit absurd. For example in nurse rostering, I could give
all nurses their day off requests if I didn't have to worry about
assigning no more than 2 shifts to the same nurse as the same
time...<br>
<blockquote type="cite">
<div style="color:#000;background-color:#fff;font-family:arial, helvetica, sans-serif;font-size:10pt;">
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;"><br>
<span></span></div>
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;"><span>But how should we then
implement importance in rules?</span></div>
</div>
</blockquote>
Define your score function as your business needs it. Use the
techniques described in the 6.0 manual: negative/postive, weights
and levels.<br>
<br>
PS: 6.0.0.Beta3 is out and the new addSoftConstraintMatch() system
is much faster and easier to use (see the blog post of a few months
ago).<br>
<blockquote type="cite">
<div style="color:#000;background-color:#fff;font-family:arial, helvetica, sans-serif;font-size:10pt;">
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;"><br>
<span></span></div>
<div style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:arial, helvetica, sans-serif;
background-color:transparent;font-style:normal;"><span>Thanks</span></div>
<div> </div>
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