[SCIP] Installation Problem on Windows

[Stefan Vigerske]

Hi,

Pyomo doesn't have a native interface to SCIP, as far as I know, but 
calls SCIP as if it were run under AMPL. That is, you need a SCIP with 
AMPL interface. This interface is found in the interfaces/ampl 
subdirectory of the SCIP source distribution.
There is also some binary for Windows available at
https://www.scipopt.org/download.php?fname=scipampl-7.0.0.win.x86_64.intel.opt.spx2.exe.zip

Stefan

On 1/18/21 7:14 PM, Cokyasar, Taner wrote:
> Hi,
> 
> I am trying to solve a nonlinear problem using the Jupyter Notebook interface to Python 3.7 via Ipopt through Pyomo modeling method.
> 
> Unfortunately, Ipopt could not solve my problem, and I started to look at alternative options.
> 
> I tried to install SCIP following instructions on here<https://www.scipopt.org/index.php#download>. Then, I tried to use it with Pyomo as follows (shown bold) and received the following error. Can you please help me get going with it?
> 
> opt = SolverFactory('scip', executable = C:/Program Files/SCIPOptSuite 7.0.2/bin/scip “
> results = opt.solve(m, tee=True)
> 
> 
> invalid parameter <C:\Users\TCOKYA~1\AppData\Local\Temp\tmp25pw_oxr.pyomo.nl>
> invalid parameter <-AMPL>
> 
> syntax: C:\Program Files\SCIPOptSuite 7.0.2\bin\scip.exe [-l <logfile>] [-q] [-s <settings>] [-r <randseed>] [-f <problem>] [-b <batchfile>] [-c "command"]
>    -v, --version : print version and build options
>    -l <logfile>  : copy output into log file
>    -q            : suppress screen messages
>    -s <settings> : load parameter settings (.set) file
>    -f <problem>  : load and solve problem file
>    -o <primref> <dualref> : pass primal and dual objective reference values for validation at the end of the solve
>    -b <batchfile>: load and execute dialog command batch file (can be used multiple times)
>    -r <randseed> : nonnegative integer to be used as random seed. Has priority over random seed specified through parameter settings (.set) file
>    -c "command"  : execute single line of dialog commands (can be used multiple times)
> 
> ---------------------------------------------------------------------------
> FileNotFoundError                         Traceback (most recent call last)
> <ipython-input-27-5b246395f577> in <module>
>       10     opt = SolverFactory('{}'.format(solver_name))
>       11 # print(opt.solve(m))
> ---> 12 results = opt.solve(m, tee=True)
>       13 ### END SOLVING THE PROBLEM ###
> 
> ~\Anaconda3\lib\site-packages\pyomo\opt\base\solvers.py in solve(self, *args, **kwds)
>      603                 print("      %6.2f seconds required for solver" % (solve_completion_time - presolve_completion_time))
>      604
> --> 605             result = self._postsolve()
>      606             result._smap_id = self._smap_id
>      607             result._smap = None
> 
> ~\Anaconda3\lib\site-packages\pyomo\solvers\plugins\solvers\SCIPAMPL.py in _postsolve(self)
>      168
>      169     def _postsolve(self):
> --> 170         results = super(SCIPAMPL, self)._postsolve()
>      171         if results.solver.message == "unknown":
>      172             results.solver.status = \
> 
> ~\Anaconda3\lib\site-packages\pyomo\opt\solver\shellcmd.py in _postsolve(self)
>      268
>      269         if self._results_format is not None:
> --> 270             results = self.process_output(self._rc)
>      271             #
>      272             # If keepfiles is true, then we pop the
> 
> ~\Anaconda3\lib\site-packages\pyomo\opt\solver\shellcmd.py in process_output(self, rc)
>      348                 results = self._results_reader(self._results_file,
>      349                                                res=results,
> --> 350                                                suffixes=self._suffixes)
>      351             results_reader_completion_time = time.time()
>      352             if self._report_timing is True:
> 
> ~\Anaconda3\lib\site-packages\pyomo\opt\plugins\sol.py in __call__(self, filename, res, soln, suffixes)
>       44         """
>       45         try:
> ---> 46             with open(filename,"r") as f:
>       47                 return self._load(f, res, soln, suffixes)
>       48         except ValueError as e:
> 
> FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\TCOKYA~1\\AppData\\Local\\Temp\\tmp25pw_oxr.pyomo.sol'
> 
> Best regards,
> _____________________________________________________________________
> Taner Cokyasar, Ph.D.
> Postdoctoral Appointee Transportation System Modeler
> Energy Systems Division | Argonne National Laboratory
> 9700 S. Cass Avenue, Lemont, IL 60439<https://goo.gl/maps/T1VuNPs75J93fn2q9>
> 
> President – Student Leadership Board
> Logistics and Supply Chain Division | Institute of Industrial & Systems Engineers
> _____________________________________________________________________
> 
> 
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