Cannot import MPI from mpi4py

[Maha]

I am trying to run an optimization program. But it gives the following  error

"ImportError: mpi4py is required for parallelization"

When I checked the mpi4py module is already loaded. But MPI cannot be imported from mpi4pyI. The following command generates the error.

" from mpi4py import MPI " gives "ImportError: DLL load failed: The specified module could not be found."

Could you please help me to solve the problem.

Thanks

Maha

[Lisandro Dalcin]

On Mon, 7 May 2018 at 11:10, Maha <maha...@gmail.com> wrote:


> I am trying to run an optimization program. But it gives the following
error
> "ImportError: mpi4py is required for parallelization"
> When I checked the mpi4py module is already loaded. But MPI cannot be
imported from mpi4pyI. The following command generates the error.
> " from mpi4py import MPI " gives "ImportError: DLL load failed: The
specified module could not be found."

So I have to guess you are using Windows. You need to install the Microsoft
MPI runtime: https://msdn.microsoft.com/en-us/library/bb524831(v=vs.85).aspx

--
Lisandro Dalcin
============
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[Maha]

Dear Dalcin

Thank you very much for the straight forward answer. It solved the problem. It helped me a lot

Thanks

Maha

[Maha D]

Dear Dalcin,

Thank you very much for the previous reply again.

I am trying to follow the example given in the 

http://www.pyopt.org/examples/examples.parallel_alpso.html

and adapt to solve the problem given in the research paper "Engineering Optimization with Particle Swarm".

The results give only with No-parallelization but not for SPM-Parallelization and DPM_parallelization.  The error is followed.

Traceback (most recent call last):

  File "C:\Users\Maha\Documents\Python\Optimisation\ALPSO PreV.py", line 79, in <module>

    alpso_spm(opt_prob)

  File "C:\Python27\lib\site-packages\pyOpt\pyOpt_optimizer.py", line 160, in __call__

    return self.__solve__(opt_problem, *args, **kwargs)

  File "C:\Python27\lib\site-packages\pyOpt\pyALPSO\pyALPSO.py", line 414, in __solve__

    fileout,filename,log_file,hos_file,seed,scale,nhs,objconfunc)

  File "C:\Python27\lib\site-packages\pyOpt\pyALPSO\alpso_spm.py", line 146, in alpso

    h_start = Bcast(h_start, root=0)

UnboundLocalError: local variable 'Bcast' referenced before assignment

I can't understand why. Could you please clarify this too. 

I have attached the program with this.

Thank

s and regards,

Mahanama

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[Lisandro Dalcin]

Ask to the pyOpt folks. I did't write that code, this is not an mpi4py bug.
Look at the code in alpso_spm.py, it should be easy to fix, look around the
lines checking mpi4py.__version__, remove all that and just write "Bcast =
comm.bcast".

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