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<div class="moz-cite-prefix">Alexis,<br>
<br>
Hot start can have several meanings.<br>
<br>
The mipstart I mentioned (due to Haroldo Gambini Santos) passes
the solution in to use in heuristics etc.<br>
<br>
Earlier ideas on hot starts (going back > 25 years) try to get
cbc to branch towards a known solution - the idea being that the
original solution might have been found at depth 50 in the Branch
and Bound tree, but could be reached at depth 10, which would
improve the shape of the search. That is the hot start in the
example. Mipstart is used frequently, while the original idea is
not - so bugs may have crept in.<br>
<br>
So try mipstart (from one of the drivers which call the "stand
alone" cbc). If you think the original idea would help, then I
would need to see an example.<br>
<br>
John Forrest<br>
On 12/05/15 18:09, Alexis wrote:<br>
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<div class="moz-cite-prefix">Thanks John.<br>
<br>
I am actually using the API. I found this example<br>
<br>
<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="https://projects.coin-or.org/Cbc/browser/trunk/Cbc/examples/hotstart.cpp">https://projects.coin-or.org/Cbc/browser/trunk/Cbc/examples/hotstart.cpp</a><br>
<br>
I will try it. Is the example you were referring to?<br>
<br>
On 2015-05-12 10:00 AM, <a moz-do-not-send="true"
class="moz-txt-link-abbreviated"
href="mailto:cbc-request@list.coin-or.org">cbc-request@list.coin-or.org</a>
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Today's Topics:
1. Hot Start for MIP (Alexis)
2. Re: Hot Start for MIP (John Forrest)
----------------------------------------------------------------------
Message: 1
Date: Mon, 11 May 2015 11:07:35 -0600
From: Alexis <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:aguigue@softree.com"><aguigue@softree.com></a>
To: <a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="mailto:cbc@list.coin-or.org">cbc@list.coin-or.org</a>
Subject: [Cbc] Hot Start for MIP
Message-ID: <a moz-do-not-send="true" class="moz-txt-link-rfc2396E" href="mailto:5550E1D7.8030902@softree.com"><5550E1D7.8030902@softree.com></a>
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I have got a large MIP to solve for which I would like to implement a
hot start strategy.
My understanding is that I should use the function
CbcModel::setHotstartSolution(const double *solution, const int
*priorities=NULL),
where solution assumes the same ''order'' of variables as defined for
the model itself. I am not so sure to understand the meaning of
the pointer priorities though. The hotstart solution I intend to give is
an actual feasible solution to the MIP.
Am I on the right track?
Thanks in advance for the help
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<div class="moz-signature">-- <br>
Alexis Guigue, E.I.T., B.Eng., M.A.Sc., Ph.D. <br>
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