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John,<br>
<br>
Determinism is mandatory for our process.<br>
So, any way to control the seed will be appreciate!<br>
Maybe, you could also implement this feature with a command-line
argument (--randomHeuristicSeed)?<br>
<br>
Two other questions:<br>
<ul>
<li>What is the exact use of randomCbcSeed. I don't set it (and
did not notice and determinism problem) and the default value
(-1) seems to generate a new seed each time cbc is launched?</li>
<li>Setting cutlength to 10000030 leads to determinism problems.
Is it also expected?</li>
</ul>
<p>Thanks.<br>
</p>
<p>Yves<br>
</p>
<br>
<div class="moz-cite-prefix">Le 07/02/2015 18:00,
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Today's Topics:
1. Re: Determinism with divingV option (John Forrest)
----------------------------------------------------------------------
Message: 1
Date: Fri, 06 Feb 2015 17:15:56 +0000
From: John Forrest <a class="moz-txt-link-rfc2396E" href="mailto:john.forrest@fastercoin.com"><john.forrest@fastercoin.com></a>
To: <a class="moz-txt-link-abbreviated" href="mailto:cbc@list.coin-or.org">cbc@list.coin-or.org</a>
Subject: Re: [Cbc] Determinism with divingV option
Message-ID: <a class="moz-txt-link-rfc2396E" href="mailto:54D4F6CC.2060404@fastercoin.com"><54D4F6CC.2060404@fastercoin.com></a>
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Yves,
It is to be expected! When an heuristic is added it is given an initial
seed for use in generating pseudo random numbers. This seed is changed
depending on k for the k'th heuristic. So adding divingVectorLength
changes the seed for the RINS heusristic.
If you don't like that, I can easily add an ifdef so
-DSAME_HEURISTIC_SEED will switch off - in CbcModel:addHeuristic.
John
On 06/02/15 14:03, Yves Touchard wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Hello,
I got a determinism problem with the lp file (and maybe others)
located here: /<a class="moz-txt-link-freetext" href="https://www.dropbox.com/s/0i7c84lbm2pvyl3/t1.lp?dl=0/">https://www.dropbox.com/s/0i7c84lbm2pvyl3/t1.lp?dl=0/</a>.
The solution file is different whether the divingV option is set or not.
Command-line is the following:
/b//in/cbc t1.lp threads 104 ratio 0.05 cutlength 30 *divingV* on
divesolves 301 multiple 1 branch printingOptions rows solution t1_0.sol/
Solution files are located here:
* Without -> /<a class="moz-txt-link-freetext" href="https://www.dropbox.com/s/zcu8kwv9ukipaqe/t1_0.sol?dl=0/">https://www.dropbox.com/s/zcu8kwv9ukipaqe/t1_0.sol?dl=0/</a>
* With -> /<a class="moz-txt-link-freetext" href="https://www.dropbox.com/s/jc1co4yeg9i13vw/t1_1.sol?dl=0/">https://www.dropbox.com/s/jc1co4yeg9i13vw/t1_1.sol?dl=0/</a>
I tried with both trunk revision 2102 and 2128.
Could you tell if it is an expected behaviour or not?
Thanks & Regards
Yves
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