>With HashSet/Map, that order changes because Object.hashCode()
returns different ints, placing elements in different HashSet
buckets, which results into a different order.
Does this mean that in an implementation without "Combination of Simulated Annealing with time spend
termination", maps and sets, the list of planning entities should have the same hashcodes every time? Or should they be sorted in the same order if sorted by hashcode?
I have a very, very simple example, on construction phase, not a single map or set, and still sequential runs do not result in the same solution...
What more can I check?
Thanks
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From: Geoffrey De Smet
<ge0ffrey.spam@gmail.com>
To: Rules Users List <rules-users@lists.jboss.org>
Sent: Tuesday, February 12, 2013 8:16 PM
Subject: Re: [rules-users] planner environmentMode - no reproducibility
Op 12-02-13 20:04, Michiel Vermandel
schreef:
Hi
Geoffrey,
Thanks for your response.
Indeed I use Simulated Annealing with maximumSecondsSpend. So
that explains the randomness of the LocalSearchPhase.
Sorry for not remembering.
Can you tell me please some more on "Use of HashSet in your
Solution class"?
Do you mean a planning fact as a HashSet?
no, just entities and values, no worries :)
I
have some HashMap fields in my Solution (which I also pass in
the cloneSolution method) but non of these fields are planning
variables/entity.
That's fine.
The entity collection is best not a HashSet/Map, because FIRST_FIT
(as well as some entity selectors) will take the original order of
the entities to do things.
With HashSet/Map, that order changes because Object.hashCode()
returns different ints, placing elements in different HashSet
buckets, which results into a different order.
Regards,
Michiel
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Common causes:
- Use of HashSet in your Solution class.
- Combination of Simulated Annealing with time spend
termination (clearly documented in manual)
Op 12-02-13
12:08, Michiel Vermandel schreef:
Hi,
Using
Planner 5.5.0-Final, currently my
environmentMode is set to DEBUG.
As I read here
(http://docs.jboss.org/drools/release/5.5.0.Final/drools-planner-docs/html_single/#d0e3120)
this mode should produce a reproducible result.
Though, even with o nly the construction phase
enabled, I get different results from sequential
runs on the same machine with the same code.
Of course full solution (with LocalSearch) results
in different outcome too.
How is this possible?
Thanks
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