[Dip] [FORGED] Dip Digest, Vol 44, Issue 3
Michael O'Sullivan
michael.osullivan at auckland.ac.nz
Fri Feb 17 18:45:17 EST 2017
Hi Romain,
If you send through the Python file(s) that create the dippy.DipProblem I can take a look from a Dippy perspective too.
Thanks, Mike
> On 18/02/2017, at 3:51 AM, "dip-request at coin-or.org" <dip-request at coin-or.org> wrote:
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> Today's Topics:
>
> 1. Re: Dippy says problem is infeasible (Romain Montagn?)
> 2. Re: Dippy says problem is infeasible (Ted Ralphs)
> 3. Re: Dippy says problem is infeasible (Romain Montagn?)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 16 Feb 2017 14:04:37 -0500
> From: Romain Montagn? <romain.montagne at polymtl.ca>
> To: Ted Ralphs <ted at lehigh.edu>
> Cc: dip <dip at list.coin-or.org>
> Subject: Re: [Dip] Dippy says problem is infeasible
> Message-ID: <7A9C6D29-DC6F-48D0-8C69-A22A6DEBC82D at polymtl.ca>
> Content-Type: text/plain; charset="utf-8"
>
> Hello Ted,
>
> I am using DIP as a generic solver. I have simply created a dippy.DipProblem that I solve with and without the doPriceCut option, like in the examples that are provided.
>
> I have attached 4 files:
>
> - LP.lp is the .lp file
> - LP_blocks.txt is the block file
> - DoPriceCut0_terminal_output.txt is what I see on my screen when I solve the problem without the doPriceCut option (and it works fine)
> - DoPriceCut1_terminal_output.txt is what I see on my screen when I solve it with the doPriceCut option (and it tells me problem infeasible)
>
> The version of DIP that I am using is 1.4.8. I work on a linux 64 bit machine, and my compiler is gcc, version 4.4.7.
>
> If you need other information please let me know.
>
> Thank you very much for your help,
>
> Romain
>
>
>
>
>
>
>
>
>> Le 16 f?vr. 2017 ? 11:38, Ted Ralphs <ted at lehigh.edu <mailto:ted at lehigh.edu>> a ?crit :
>>
>> Hi Romain,
>>
>> Are you using DIP as a generic solver or have you built an application? Can you send the .lp file and the block file, as well as other information, such as version number, platform, compiler, etc.? I would like to try and replicate this.
>>
>> Cheers,
>>
>> Ted
>>
>> On Thu, Feb 9, 2017 at 6:36 PM, Romain Montagn? <romain.montagne at polymtl.ca <mailto:romain.montagne at polymtl.ca>> wrote:
>> PS: After saying the problem is infeasible, I get the following error: "Segmentation fault (core dumped)"
>>
>>
>>> Le 9 f?vr. 2017 ? 17:45, Romain Montagn? <romain.montagne at polymtl.ca <mailto:romain.montagne at polymtl.ca>> a ?crit :
>>>
>>> Hello DIP community,
>>>
>>> I am using Dippy to solve a MILP. I want to compare branch-and-bound and branch-and-price performances.
>>>
>>> When I solve the problem with branch-and-bound (i.e., with the option ?doPriceCut? set to 0), it works great. But when I activate the ?doPriceCut? option for branch-and-price, it tells me the problem is infeasible.
>>>
>>> Does anyone know what is happening?
>>>
>>> I have looked at the .lp file as well as the block file and they look ok.
>>>
>>> Any help is greatly appreciated.
>>>
>>> Cheers,
>>>
>>> Romain Montagn?, PhD
>>
>>
>> _______________________________________________
>> Dip mailing list
>> Dip at list.coin-or.org <mailto:Dip at list.coin-or.org>
>> https://urldefense.proofpoint.com/v2/url?u=http-3A__list.coin-2Dor.org_mailman_listinfo_dip&d=CwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=rnUB298ByR5BGgo6vv2b6g&m=SQ6EyINjMS0JVGwJJandNupwBLGNKe61En7rTWKugOY&s=-XIQIHlDQ8zaq0_-XbJ7Y9UA_fut5QgegRRy2uMeO1k&e= <https://urldefense.proofpoint.com/v2/url?u=http-3A__list.coin-2Dor.org_mailman_listinfo_dip&d=CwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=rnUB298ByR5BGgo6vv2b6g&m=SQ6EyINjMS0JVGwJJandNupwBLGNKe61En7rTWKugOY&s=-XIQIHlDQ8zaq0_-XbJ7Y9UA_fut5QgegRRy2uMeO1k&e=>
>>
>>
>>
>> --
>> Dr. Ted Ralphs
>> Visiting Researcher, Zuse Institute Berlin
>> Professor, Lehigh University
>> (610) 628-1280
>> ted 'at' lehigh 'dot' edu
>> coral.ie.lehigh.edu/~ted <https://urldefense.proofpoint.com/v2/url?u=http-3A__coral.ie.lehigh.edu_-7Eted&d=DwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=9jaw7Wd-6mEsLj8M5sB-_WXWhyouqYESO4E_zKqChXU&m=yUGU_75-7m-CeFlEkw6v6lST8C3JW6sUaNToiFlJFro&s=WkE3kfeZsAqiGAv4PqAvuTWrEz9tG3_xWgUBf0BineA&e= >
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>
> ------------------------------
>
> Message: 2
> Date: Thu, 16 Feb 2017 16:59:22 -0500
> From: Ted Ralphs <ted at lehigh.edu>
> To: Romain Montagn? <romain.montagne at polymtl.ca>
> Cc: dip <dip at list.coin-or.org>
> Subject: Re: [Dip] Dippy says problem is infeasible
> Message-ID:
> <CA+GYycs9KH03eeXVxo_jB_Qt3XMkdH3BSEdUWE_S_K3Oh_rCVg at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Romain,
>
> What's the version of DipPy you are using? How are you reading the problem
> into DipPy? Are you able to share the Python script you're using?
>
> Cheers,
>
> Ted
>
>
>
> On Thu, Feb 16, 2017 at 2:04 PM, Romain Montagn? <romain.montagne at polymtl.ca
>> wrote:
>
>> Hello Ted,
>>
>> I am using DIP as a generic solver. I have simply created a
>> dippy.DipProblem that I solve with and without the doPriceCut option, like
>> in the examples that are provided.
>>
>> I have attached 4 files:
>>
>> - LP.lp is the .lp file
>> - LP_blocks.txt is the block file
>> - DoPriceCut0_terminal_output.txt is what I see on my screen when I solve
>> the problem without the doPriceCut option (and it works fine)
>> - DoPriceCut1_terminal_output.txt is what I see on my screen when I solve
>> it with the doPriceCut option (and it tells me problem infeasible)
>>
>> The version of DIP that I am using is 1.4.8. I work on a linux 64 bit
>> machine, and my compiler is gcc, version 4.4.7.
>>
>> If you need other information please let me know.
>>
>> Thank you very much for your help,
>>
>> Romain
>>
>>
>>
>>
>>
>>
>>
>>
>> Le 16 f?vr. 2017 ? 11:38, Ted Ralphs <ted at lehigh.edu> a ?crit :
>>
>> Hi Romain,
>>
>> Are you using DIP as a generic solver or have you built an application?
>> Can you send the .lp file and the block file, as well as other information,
>> such as version number, platform, compiler, etc.? I would like to try and
>> replicate this.
>>
>> Cheers,
>>
>> Ted
>>
>> On Thu, Feb 9, 2017 at 6:36 PM, Romain Montagn? <
>> romain.montagne at polymtl.ca> wrote:
>>
>>> PS: After saying the problem is infeasible, I get the following error: "Segmentation
>>> fault (core dumped)"
>>>
>>>
>>> Le 9 f?vr. 2017 ? 17:45, Romain Montagn? <romain.montagne at polymtl.ca> a
>>> ?crit :
>>>
>>> Hello DIP community,
>>>
>>> I am using Dippy to solve a MILP. I want to compare branch-and-bound and
>>> branch-and-price performances.
>>>
>>> When I solve the problem with branch-and-bound (i.e., with the option
>>> ?doPriceCut? set to 0), it works great. But when I activate the
>>> ?doPriceCut? option for branch-and-price, it tells me the problem is
>>> infeasible.
>>>
>>> Does anyone know what is happening?
>>>
>>> I have looked at the .lp file as well as the block file and they look ok.
>>>
>>> Any help is greatly appreciated.
>>>
>>> Cheers,
>>>
>>> Romain Montagn?, PhD
>>>
>>>
>>>
>>> _______________________________________________
>>> Dip mailing list
>>> Dip at list.coin-or.org
>>> https://urldefense.proofpoint.com/v2/url?u=http-3A__list.coi
>>> n-2Dor.org_mailman_listinfo_dip&d=CwICAg&c=Ngd-ta5yRYsqeUs
>>> EDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=rnUB298ByR5BGgo6vv2b6g&m=SQ6
>>> EyINjMS0JVGwJJandNupwBLGNKe61En7rTWKugOY&s=-XIQIHlDQ8zaq0_-
>>> XbJ7Y9UA_fut5QgegRRy2uMeO1k&e=
>>>
>>
>>
>>
>> --
>> Dr. Ted Ralphs
>> Visiting Researcher, Zuse Institute Berlin
>> Professor, Lehigh University
>> (610) 628-1280
>> ted 'at' lehigh 'dot' edu
>> coral.ie.lehigh.edu/~ted
>>
>>
>>
>>
>
>
> --
> Dr. Ted Ralphs
> Visiting Researcher, Zuse Institute Berlin
> Professor, Lehigh University
> (610) 628-1280
> ted 'at' lehigh 'dot' edu
> coral.ie.lehigh.edu/~ted
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>
> ------------------------------
>
> Message: 3
> Date: Thu, 16 Feb 2017 17:24:38 -0500
> From: Romain Montagn? <romain.montagne at polymtl.ca>
> To: Ted Ralphs <ted at lehigh.edu>
> Cc: dip <dip at list.coin-or.org>
> Subject: Re: [Dip] Dippy says problem is infeasible
> Message-ID: <4DA1977A-10CD-490B-993F-857811E79DED at polymtl.ca>
> Content-Type: text/plain; charset="utf-8"
>
> I am using DipPy version 1.9.8. I will gladly share my scripts with you. All you have to do is adjust your path at the top of the RR_dippy.py so that it locates the file of Instances.
>
> Also, in the script I use the NetworkX module, you might have to download it.
>
> Let me know if I forgot something.
>
> Thanks!
>
>
>
>> Le 16 f?vr. 2017 ? 16:59, Ted Ralphs <ted at lehigh.edu> a ?crit :
>>
>> Hi Romain,
>>
>> What's the version of DipPy you are using? How are you reading the problem into DipPy? Are you able to share the Python script you're using?
>>
>> Cheers,
>>
>> Ted
>>
>>
>>
>> On Thu, Feb 16, 2017 at 2:04 PM, Romain Montagn? <romain.montagne at polymtl.ca <mailto:romain.montagne at polymtl.ca>> wrote:
>> Hello Ted,
>>
>> I am using DIP as a generic solver. I have simply created a dippy.DipProblem that I solve with and without the doPriceCut option, like in the examples that are provided.
>>
>> I have attached 4 files:
>>
>> - LP.lp is the .lp file
>> - LP_blocks.txt is the block file
>> - DoPriceCut0_terminal_output.txt is what I see on my screen when I solve the problem without the doPriceCut option (and it works fine)
>> - DoPriceCut1_terminal_output.txt is what I see on my screen when I solve it with the doPriceCut option (and it tells me problem infeasible)
>>
>> The version of DIP that I am using is 1.4.8. I work on a linux 64 bit machine, and my compiler is gcc, version 4.4.7.
>>
>> If you need other information please let me know.
>>
>> Thank you very much for your help,
>>
>> Romain
>>
>>
>>
>>
>>
>>
>>
>>
>>> Le 16 f?vr. 2017 ? 11:38, Ted Ralphs <ted at lehigh.edu <mailto:ted at lehigh.edu>> a ?crit :
>>>
>>> Hi Romain,
>>>
>>> Are you using DIP as a generic solver or have you built an application? Can you send the .lp file and the block file, as well as other information, such as version number, platform, compiler, etc.? I would like to try and replicate this.
>>>
>>> Cheers,
>>>
>>> Ted
>>>
>>> On Thu, Feb 9, 2017 at 6:36 PM, Romain Montagn? <romain.montagne at polymtl.ca <mailto:romain.montagne at polymtl.ca>> wrote:
>>> PS: After saying the problem is infeasible, I get the following error: "Segmentation fault (core dumped)"
>>>
>>>
>>>> Le 9 f?vr. 2017 ? 17:45, Romain Montagn? <romain.montagne at polymtl.ca <mailto:romain.montagne at polymtl.ca>> a ?crit :
>>>>
>>>> Hello DIP community,
>>>>
>>>> I am using Dippy to solve a MILP. I want to compare branch-and-bound and branch-and-price performances.
>>>>
>>>> When I solve the problem with branch-and-bound (i.e., with the option ?doPriceCut? set to 0), it works great. But when I activate the ?doPriceCut? option for branch-and-price, it tells me the problem is infeasible.
>>>>
>>>> Does anyone know what is happening?
>>>>
>>>> I have looked at the .lp file as well as the block file and they look ok.
>>>>
>>>> Any help is greatly appreciated.
>>>>
>>>> Cheers,
>>>>
>>>> Romain Montagn?, PhD
>>>
>>>
>>> _______________________________________________
>>> Dip mailing list
>>> Dip at list.coin-or.org <mailto:Dip at list.coin-or.org>
>>> https://urldefense.proofpoint.com/v2/url?u=http-3A__list.coin-2Dor.org_mailman_listinfo_dip&d=CwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=rnUB298ByR5BGgo6vv2b6g&m=SQ6EyINjMS0JVGwJJandNupwBLGNKe61En7rTWKugOY&s=-XIQIHlDQ8zaq0_-XbJ7Y9UA_fut5QgegRRy2uMeO1k&e= <https://urldefense.proofpoint.com/v2/url?u=http-3A__list.coin-2Dor.org_mailman_listinfo_dip&d=CwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=rnUB298ByR5BGgo6vv2b6g&m=SQ6EyINjMS0JVGwJJandNupwBLGNKe61En7rTWKugOY&s=-XIQIHlDQ8zaq0_-XbJ7Y9UA_fut5QgegRRy2uMeO1k&e=>
>>>
>>>
>>>
>>> --
>>> Dr. Ted Ralphs
>>> Visiting Researcher, Zuse Institute Berlin
>>> Professor, Lehigh University
>>> (610) 628-1280 <tel:(610)%20628-1280>
>>> ted 'at' lehigh 'dot' edu
>>> coral.ie.lehigh.edu/~ted <https://urldefense.proofpoint.com/v2/url?u=http-3A__coral.ie.lehigh.edu_-7Eted&d=DwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=9jaw7Wd-6mEsLj8M5sB-_WXWhyouqYESO4E_zKqChXU&m=yUGU_75-7m-CeFlEkw6v6lST8C3JW6sUaNToiFlJFro&s=WkE3kfeZsAqiGAv4PqAvuTWrEz9tG3_xWgUBf0BineA&e= >
>>
>>
>>
>>
>>
>> --
>> Dr. Ted Ralphs
>> Visiting Researcher, Zuse Institute Berlin
>> Professor, Lehigh University
>> (610) 628-1280
>> ted 'at' lehigh 'dot' edu
>> coral.ie.lehigh.edu/~ted <https://urldefense.proofpoint.com/v2/url?u=http-3A__coral.ie.lehigh.edu_-7Eted&d=DwICAg&c=Ngd-ta5yRYsqeUsEDgxhcqsYYY1Xs5ogLxWPA_2Wlc4&r=9jaw7Wd-6mEsLj8M5sB-_WXWhyouqYESO4E_zKqChXU&m=yUGU_75-7m-CeFlEkw6v6lST8C3JW6sUaNToiFlJFro&s=WkE3kfeZsAqiGAv4PqAvuTWrEz9tG3_xWgUBf0BineA&e= >
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