solve_problem_by_Cplex.py #2
Comments
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Hi,
Fixed. Please pull the updated *solve_problem_by_Cplex.py*, and the /res/lp
directory.
However, please note that this is a rather old version - the newer versions
now use Gurobi. Hence I can't guarantee it really works.
Good luck,
…On Thu, Jun 29, 2023 at 6:11 PM zhangshuaiqing ***@***.***> wrote:
if *name* == "*main*":
solve_problem_by_Cplex ('../res/problem.lp')
I can't find problem.lp under the res folder.
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Thank you for your reply, and I have another problem when running toy_example.py such as |
|
Hi,
You may find them here
<https://github.com/ofanan/SFC_migration/tree/d20c481ff2d08287708afa6b16e4abd1c86072b1/src>
.
Please inform me whether they run properly. If so, I'll push them again
into the main update repo.
Best wishes,
…On Thu, Jun 29, 2023 at 7:52 PM zhangshuaiqing ***@***.***> wrote:
Thank you for your reply, and I have another problem when running
toy_example.py such as
ModuleNotFoundError: No module named 'Check_sol' and
ModuleNotFoundError: No module named 'obj_func'
and I check that there no file Check_sol and obj_func under src folder.
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Itamar Cohen, www.ofanan.com
*“The only thing necessary for the triumph of evil is for good men to do
nothing” (*Edmund Burke)
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Hi, |
When I tried again, I meet this problem. but when the input file is shoter.lp, the program runs correctly and returns, Sol status: optimal lp sol cost = 4.00 I learn from the Internet that the academic version of cplex only supports solving problems with 1000 variables, and the number of variables required to be solved in problem.lp is 6410. Is this the cause of the program error? |
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Hi,
That makes sense.
I don't remember that we faced such a problem, but maybe this only because
we gave up using Cplex at a rather early stage of our work - we focused on
developing our own approximation algorithms.
When we tried LP solvers again, we used Gurobi. There are functions that
solve the updated formulation of the problem in SFC_mig_simulator.py.
Although it was a rather large problem, Gurobi's free academic license got
along with that, without such errors.
SFC_mig_simulator also contains functions that solve the problem using
Python's default LP solver, which works without downloading any external
tool - only regular "pip install".. However, it is much slower than Gurobi.
Best,
On Thu, Jun 29, 2023 at 9:16 PM zhangshuaiqing ***@***.***>
wrote:
… Hi, Fixed. Please pull the updated *solve_problem_by_Cplex.py*, and the
/res/lp directory. However, please note that this is a rather old version -
the newer versions now use Gurobi. Hence I can't guarantee it really works.
Good luck,
… <#m_-3348353039656746539_>
On Thu, Jun 29, 2023 at 6:11 PM zhangshuaiqing *@*.*> wrote: if name ==
"main": solve_problem_by_Cplex ('../res/problem.lp') I can't find
problem.lp under the res folder. — Reply to this email directly, view it on
GitHub <#2 <#2>>, or
unsubscribe
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-- Itamar Cohen, www.ofanan.com *“The only thing necessary for the
triumph of evil is for good men to do nothing” (*Edmund Burke)
When I tried again, I meet this problem.
CPLEX Error 1016: Community Edition. Problem size limits exceeded.
Purchase at http://ibm.biz/error1016.
Traceback (most recent call last):
File ".\solve_problem_by_Cplex.py", line 44, in
solve_problem_by_Cplex ('../res/lp/problem.lp')
problem.solve () #TimeLimit=1000?
File "D:\python\anaconda3\envs\sumo\lib\site-packages\cplex_*init*_.py",
line 1312, in solve
_proc.lpopt(self._env._e, self._lp)
File
"D:\python\anaconda3\envs\sumo\lib\site-packages\cplex_internal_procedural.py",
line 738, in lpopt
check_status(env, status)
File
"D:\python\anaconda3\envs\sumo\lib\site-packages\cplex_internal_procedural.py",
line 249, in *call*
raise CplexSolverError(error_string, env, status)
cplex.exceptions.errors.CplexSolverError: CPLEX Error 1016: Community
Edition. Problem size limits exceeded. Purchase at
http://ibm.biz/error1016.
but when the input file is shoter.lp, the program runs correctly and
returns,
Version identifier: 22.1.0.0 | 2022-03-25 | 54982fbec
CPXPARAM_Read_DataCheck 1
Tried aggregator 1 time.
LP Presolve eliminated 2 rows and 3 columns.
All rows and columns eliminated.
Presolve time = 0.00 sec. (0.00 ticks)
------------------------------
Sol status: optimal
------------------------------
lp sol cost = 4.00
I learn from the Internet that the academic version of cplex only supports
solving problems with 1000 variables, and the number of variables required
to be solved in problem.lp is 6410. Is this the cause of the program error?
—
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--
Itamar Cohen, www.ofanan.com
*“The only thing necessary for the triumph of evil is for good men to do
nothing” (*Edmund Burke)
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Hi, |
|
Hi,
I used there a primitive version of self-modifying-code: the files
obj_func.py and Check_sol.py should actually be generated by a previous run
of toy_example.py itself (while commenting their imports).
Please see the documentation at the first lines of the updated version of
toy_example.py
<https://github.com/ofanan/SFC_migration/blob/main/src/toy_example.py>
Best wishes,
On Sat, Jul 1, 2023 at 9:24 AM zhangshuaiqing ***@***.***>
wrote:
… Hi, You may find them here
https://github.com/ofanan/SFC_migration/tree/d20c481ff2d08287708afa6b16e4abd1c86072b1/src
. Please inform me whether they run properly. If so, I'll push them again
into the main update repo. Best wishes,
… <#m_-4358737536543253729_>
On Thu, Jun 29, 2023 at 7:52 PM zhangshuaiqing *@*.*> wrote: Thank you
for your reply, and I have another problem when running toy_example.py such
as ModuleNotFoundError: No module named 'Check_sol' and
ModuleNotFoundError: No module named 'obj_func' and I check that there no
file Check_sol and obj_func under src folder. — Reply to this email
directly, view it on GitHub <#2 (comment)
<#2 (comment)>>,
or unsubscribe
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-- Itamar Cohen, www.ofanan.com *“The only thing necessary for the
triumph of evil is for good men to do nothing” (*Edmund Burke)
Hi,
I find obj_func but no Check_sol under
https://github.com/ofanan/SFC_migration/tree/d20c481ff2d08287708afa6b16e4abd1c86072b1/src
.
Please push them again into the main update repo., thanks.
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You are receiving this because you commented.Message ID:
***@***.***>
--
Itamar Cohen, www.ofanan.com
*“The only thing necessary for the triumph of evil is for good men to do
nothing” (*Edmund Burke)
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if name == "main":
solve_problem_by_Cplex ('../res/problem.lp')
I can't find problem.lp under the res folder.
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