CBC parameters
George DeLendonck
I have done two projects with it. I have got very good results with CBC. The only issue I have so far is that in some cases CBC takes a long time and I would like to be able to limit the run time. Could you tell me how I could pass some parameter to CBC to limit run time? Thank you very much for your help.
George deLendonck
geo...@atrenta.com
________________________________
NOTE: This message and its attachments are intended only for the individual or
entity to which it is addressed and may contain confidential information or
forward-looking statements regarding product development. Forward-looking
statements are subject to change at Atrenta's sole discretion and Atrenta will have
no liability for the delay or failure to deliver any product or feature mentioned in
such forward-looking statements.
Fernando Badilla Veliz
To pass some parameters to the solver, they usually go in the solve() statement. For CBC, as you can browse in the source code (PuLP-1.4.7/src/pulp):
class COIN_CMD(LpSolver_CMD):
"""The COIN CLP/CBC LP solver
now only uses cbc
"""
def defaultPath(self):
return self.executableExtension(cbc_path)
def __init__(self, path = None, keepFiles = 0, mip = 1,
msg = 0, cuts = None, presolve = None, dual = None,
strong = None, options = [],
fracGap = None, maxSeconds = None, threads = None)
You got plenty of options... I have succesfully tried these ones:
model.solve(COIN(threads=2,fracGap=0.001,msg=1,options=['sec','500']))
fracGap is like a mipgap tolerance termination.
and options=['sec','500'] is for time termination.
Hope that helps!
fbv
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George DeLendonck
George
________________________________________
From: pulp-or...@googlegroups.com [pulp-or...@googlegroups.com] On Behalf Of Fernando Badilla Veliz [fernand...@gmail.com]
Sent: Saturday, May 07, 2011 1:40 PM
To: pulp-or...@googlegroups.com
Subject: Re: CBC parameters
Hi
To pass some parameters to the solver, they usually go in the solve() statement. For CBC, as you can browse in the source code (PuLP-1.4.7/src/pulp):
class COIN_CMD(LpSolver_CMD):
"""The COIN CLP/CBC LP solver
now only uses cbc
"""
def defaultPath(self):
return self.executableExtension(cbc_path)
def __init__(self, path = None, keepFiles = 0, mip = 1,
msg = 0, cuts = None, presolve = None, dual = None,
strong = None, options = [],
fracGap = None, maxSeconds = None, threads = None)
You got plenty of options... I have succesfully tried these ones:
model.solve(COIN(threads=2,fracGap=0.001,msg=1,options=['sec','500']))
fracGap is like a mipgap tolerance termination.
and options=['sec','500'] is for time termination.
Hope that helps!
fbv
On Sat, May 7, 2011 at 12:06 PM, George DeLendonck <geo...@atrenta.com<mailto:geo...@atrenta.com>> wrote:
I am a new user of Pulp. First I need to thank you guys for coming up with this tool. I found it be extremely intuitive and easy to use.
I have done two projects with it. I have got very good results with CBC. The only issue I have so far is that in some cases CBC takes a long time and I would like to be able to limit the run time. Could you tell me how I could pass some parameter to CBC to limit run time? Thank you very much for your help.
George deLendonck
geo...@atrenta.com<mailto:geo...@atrenta.com>
________________________________
NOTE: This message and its attachments are intended only for the individual or
entity to which it is addressed and may contain confidential information or
forward-looking statements regarding product development. Forward-looking
statements are subject to change at Atrenta's sole discretion and Atrenta will have
no liability for the delay or failure to deliver any product or feature mentioned in
such forward-looking statements.
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George DeLendonck
I tried something slightly different from what you gave me because in my case the coin dll was called. Anyway thanks for the tip.
I am really impressed with Pulp and CBC.
George
________________________________________
From: pulp-or...@googlegroups.com [pulp-or...@googlegroups.com] On Behalf Of Fernando Badilla Veliz [fernand...@gmail.com]
Sent: Saturday, May 07, 2011 1:40 PM
To: pulp-or...@googlegroups.com
Subject: Re: CBC parameters
Hi
To pass some parameters to the solver, they usually go in the solve() statement. For CBC, as you can browse in the source code (PuLP-1.4.7/src/pulp):
class COIN_CMD(LpSolver_CMD):
"""The COIN CLP/CBC LP solver
now only uses cbc
"""
def defaultPath(self):
return self.executableExtension(cbc_path)
def __init__(self, path = None, keepFiles = 0, mip = 1,
msg = 0, cuts = None, presolve = None, dual = None,
strong = None, options = [],
fracGap = None, maxSeconds = None, threads = None)
You got plenty of options... I have succesfully tried these ones:
model.solve(COIN(threads=2,fracGap=0.001,msg=1,options=['sec','500']))
fracGap is like a mipgap tolerance termination.
and options=['sec','500'] is for time termination.
Hope that helps!
fbv
On Sat, May 7, 2011 at 12:06 PM, George DeLendonck <geo...@atrenta.com<mailto:geo...@atrenta.com>> wrote:
I am a new user of Pulp. First I need to thank you guys for coming up with this tool. I found it be extremely intuitive and easy to use.
I have done two projects with it. I have got very good results with CBC. The only issue I have so far is that in some cases CBC takes a long time and I would like to be able to limit the run time. Could you tell me how I could pass some parameter to CBC to limit run time? Thank you very much for your help.
George deLendonck
geo...@atrenta.com<mailto:geo...@atrenta.com>
________________________________
NOTE: This message and its attachments are intended only for the individual or
entity to which it is addressed and may contain confidential information or
forward-looking statements regarding product development. Forward-looking
statements are subject to change at Atrenta's sole discretion and Atrenta will have
no liability for the delay or failure to deliver any product or feature mentioned in
such forward-looking statements.
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--
cellphone 056 9 93099326
home 056 2 4942633
www.cec.uchile.cl/~fbadilla<http://www.cec.uchile.cl/~fbadilla>