[RBFOpt] Running example in RBFOpt

[Giacomo Nannicini]

Yes but in the code snippet you sent in the previous email, you are
then passing a different RbfoptSettings object to RbfoptAlgorithm --
not the one for which you set the path.

On Wed, Sep 23, 2020 at 8:50 PM Chuong Thaidoan
<chuongthaidoan at gmail.com> wrote:
>
> Dear Giacomo,
> Thank you for your prompt reply. I already set the Path in the second line of the Python code, which is as follows:
>
> settings = rbfopt.RbfoptSettings(minlp_solver_path='/home/chuong/bonmin-stable/build/bonmin',\
>                                  nlp_solver_path='/home/chuong/bonmin-stable/build/ipopt')
>
> or
>
> import rbfopt
> settings = rbfopt.RbfoptSettings(minlp_solver_path='Cygwin64/home/chuong/bonmin-stable/build/bonmin',\
>                                  nlp_solver_path='Cygwin64/home/chuong/bonmin-stable/build/ipopt')
>
>
> On Thu, Sep 24, 2020 at 10:43 AM Giacomo Nannicini <giacomo.n at gmail.com> wrote:
>>
>> I do not understand the order of the code in the Python snippet.
>> If bonmin and ipopt are not in your part, you must set the
>> corresponding options in the RbfoptSettings object that is passed to
>> RbfoptAlgorithm.
>>
>> Giacomo
>>
>> On Wed, Sep 23, 2020 at 8:38 PM Chuong Thaidoan
>> <chuongthaidoan at gmail.com> wrote:
>> >
>> > Dear Giacomo,
>> > Thank you for your advice. I have just to re-install Bonmin and run the code. It shows errors as follows. Could you please take a look and let me know some further comments?
>> > Iter  Cycle  Action             Objective value      Time      Gap
>> >   ----  -----  ------             ---------------      ----      ---
>> >      0      0  Initialization           -0.782797      0.01   100.00 *
>> >      0      0  Initialization           69.095477      0.01   100.00
>> >      0      0  Initialization           20.000000      0.01   100.00
>> >      0      0  GlobalStep               -9.829600      0.03   100.00 *
>> >      1      0  GlobalStep               -9.946732      0.06   100.00 *
>> >      2      0  GlobalStep               -0.133622      0.08   100.00
>> >      3      0  GlobalStep               -8.304083      0.10   100.00
>> >      4      0  GlobalStep               -9.999968      0.12   100.00 *
>> > Traceback (most recent call last):
>> >   File "C:/Users/chuong/PycharmProjects/LearningPython/Ipopt/RBFOpt_test_ipopt.py", line 14, in <module>
>> >     val, x, itercount, evalcount, fast_evalcount = alg.optimize()
>> >   File "C:\ProgramData\Anaconda3\lib\site-packages\rbfopt\rbfopt_algorithm.py", line 795, in optimize
>> >     self.optimize_serial(pause_after_iters)
>> >   File "C:\ProgramData\Anaconda3\lib\site-packages\rbfopt\rbfopt_algorithm.py", line 1056, in optimize_serial
>> >     self.node_is_noisy)
>> >   File "C:\ProgramData\Anaconda3\lib\site-packages\rbfopt\rbfopt_algorithm.py", line 2438, in local_step
>> >     categorical_info, node_pos, rbf_lambda, rbf_h, node_pos[fmin_index])
>> >   File "C:\ProgramData\Anaconda3\lib\site-packages\rbfopt\rbfopt_aux_problems.py", line 297, in minimize_rbf
>> >     if (not opt.available()):
>> >   File "C:\ProgramData\Anaconda3\lib\site-packages\pyomo\opt\base\solvers.py", line 99, in available
>> >     raise pyutilib.common.ApplicationError("Solver (%s) not available" % str(self.name))
>> > pyutilib.common._exceptions.ApplicationError: Solver (bonmin) not available
>> >
>> > Your code:
>> >
>> > import rbfopt
>> >
>> > settings = rbfopt.RbfoptSettings(minlp_solver_path='/home/chuong/bonmin-stable/build/bonmin',\
>> >                                  nlp_solver_path='/home/chuong/bonmin-stable/build/ipopt')
>> >
>> > import numpy as np
>> > def obj_funct(x):
>> >   return x[0]*x[1] - x[2]
>> >
>> > bb = rbfopt.RbfoptUserBlackBox(3, np.array([0] * 3), np.array([10] * 3),
>> >                                np.array(['R', 'I', 'R']), obj_funct)
>> > settings = rbfopt.RbfoptSettings(max_evaluations=50)
>> > alg = rbfopt.RbfoptAlgorithm(settings, bb)
>> > val, x, itercount, evalcount, fast_evalcount = alg.optimize()
>> >
>> >
>> > On Wed, Sep 23, 2020 at 11:43 PM Giacomo Nannicini <giacomo.n at gmail.com> wrote:
>> >>
>> >> You need both executables. You can download them from AMPL's website. If you compile from scratch, then Bonmin will also compile Ipopt.
>> >>
>> >> If the executables are not in the system path, you can specify their location via options.
>> >>
>> >>
>> >> G
>> >>
>> >>
>> >> On Wed, Sep 23, 2020, 9:36 AM Chuong Thaidoan <chuongthaidoan at gmail.com> wrote:
>> >>>
>> >>> Dear Giacomo,
>> >>> Thank you for your email. I am re-installing Bonmin because it still shows errors although I already specified the Path. Can I ask it is true that Bonmin contains Ipopt and so we only need to install Bonmin with Cygwin 64?
>> >>> Best regards,
>> >>> TD Chuong
>> >>>
>> >>> On Wed, Sep 23, 2020 at 10:46 PM Giacomo Nannicini <giacomo.n at gmail.com> wrote:
>> >>>>
>> >>>> Chuong,
>> >>>> please read the instruction manual, section 1.2. You need Bonmin and
>> >>>> Ipopt to be in your system path, or otherwise you need to specify
>> >>>> their location as options.
>> >>>>
>> >>>> Best,
>> >>>>
>> >>>> Giacomo
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>> Dear the authors,
>> >>>> I am studying your interesting black-box function packages (RBFOpt),
>> >>>> and I just install it with Bonmin-1.8.8 solver via Cygwin64. I put
>> >>>> your "minimal working example" in Bonmin-1.8.8 folder and run it with
>> >>>> Pycharm. However, it shows errors
>> >>>> "pyutilib.common._exceptions.ApplicationError: Solver (bonmin) not
>> >>>> available".
>> >>>>
>> >>>> Could you please let me know some your advice? Thank you.
>> >>>> Best regards,
>> >>>> Chuong Thai Doan
>> >>>> Research Fellow at School of Information Technology
>> >>>> Deakin University, Melbourne, Australia