Decision Optimization

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  • 1.  Cplex 12:10 and Python

    Posted Mon May 25, 2020 08:20 AM

    Hey everyone,

    I had the unfortunate idea of updating cplex in my computer, but after doing that I can't run any notebook using the docplex library. Everytime I tried the following error appears:

    With cplex 12.8, it was working normally.

    Any suggestions.

    ---------------------------------------------------------------------------
    AttributeError                            Traceback (most recent call last)
    <ipython-input-8-dd5ac9c2ee34> in <module>()
          6 for i in range(2,3):
          7     print(i)
    ----> 8     LB,runtimetotal,UB,FirstLB,gap,cnt,case,status = AvoidanceRelaxed(i,cp)
          9     print('\n>>> MAIN')
         10     print(i,LB,UB,runtimetotal,FirstLB,gap,cnt,case,status,file=d)
    
    <ipython-input-7-cd16611bc907> in AvoidanceRelaxed(n, nps)
         63         # z constraint
         64         for (i,j) in P:
    ---> 65             model.add_constraint(xr0[(i,j)]*vy[(i,j)] - yr0[(i,j)]*vx[(i,j)] <= (1- z[(i,j)])*Mbin11[(i,j)])
         66             model.add_constraint(xr0[(i,j)]*vy[(i,j)] - yr0[(i,j)]*vx[(i,j)] >= -z[(i,j)]*Mbin12[(i,j)])
         67 
    
    ~\AppData\Roaming\Python\Python36\site-packages\docplex\mp\model.py in add_constraint(self, ct, ctname)
       3325             :func:`add_constraint_`
       3326         """
    -> 3327         ct = self._add_constraint_internal(ct, ctname)
       3328         return ct
       3329 
    
    ~\AppData\Roaming\Python\Python36\site-packages\docplex\mp\model.py in _add_constraint_internal(self, ct, ctname)
       2811         check_trivial = self._checker.check_trivial_constraints()
       2812         if self._prepare_constraint(ct, used_ct_name, check_for_trivial_ct=check_trivial):
    -> 2813             self._post_constraint(ct)
       2814             return ct
       2815         elif ct is True or ct is False:
    
    ~\AppData\Roaming\Python\Python36\site-packages\docplex\mp\model.py in _post_constraint(self, ct)
       2819 
       2820     def _post_constraint(self, ct):
    -> 2821         ct_engine_index = self._create_engine_constraint(ct)
       2822         self._register_one_constraint(ct, ct_engine_index, is_ctname_safe=True)
       2823         return ct
    
    ~\AppData\Roaming\Python\Python36\site-packages\docplex\mp\model.py in _create_engine_constraint(self, ct)
       2697         eng = self.__engine
       2698         if isinstance(ct, LinearConstraint):
    -> 2699             return eng.create_linear_constraint(ct)
       2700         elif isinstance(ct, RangeConstraint):
       2701             return eng.create_range_constraint(ct)
    
    ~\AppData\Roaming\Python\Python36\site-packages\docplex\mp\cplex_engine.py in create_linear_constraint(self, binaryct)
        770         return self._make_cplex_linear_ct(cpx_lin_expr=cpx_linexp,
        771                                           cpx_sense=binaryct.cplex_code(),
    --> 772                                           rhs=num_rhs, name=binaryct.get_name())
        773 
        774     def create_block_linear_constraints(self, linct_seq):
    
    ~\AppData\Roaming\Python\Python36\site-packages\docplex\mp\cplex_engine.py in _make_cplex_linear_ct(self, cpx_lin_expr, cpx_sense, rhs, name)
        758         cpxnames = [name] if name else []
        759 
    --> 760         ret_add = fast_add_linear(self._cplex, cpx_lin_expr, cpx_sense, cpx_rhs, cpxnames)
        761         return self._allocate_one_index(ret_value=ret_add, scope=self._lincts_scope, expect_range=True)
        762 
    
    ~\AppData\Roaming\Python\Python36\site-packages\docplex\mp\cplex_engine.py in fast_add_linear(cpx, lin_expr, cpx_senses, rhs, names, ranges)
        129         cpxenv = cpx._env
        130         with chbmatrix(lin_expr, cpx._env_lp_ptr, 0,
    --> 131                        cpxenv._apienc) as (rmat, nnz):
        132             addrows(cpxenv._e, cpx._lp, 0,
        133                     len(rhs), nnz, rhs, cpx_senses,
    
    AttributeError: 'Environment' object has no attribute '_apienc'
    


    ------------------------------
    Fernando Dias
    ------------------------------


  • 2.  RE: Cplex 12:10 and Python

    Posted Mon May 25, 2020 09:16 AM
    Did you also update docplex? What version of docplex do you use?

    ------------------------------
    Daniel Junglas
    ------------------------------



  • 3.  RE: Cplex 12:10 and Python

    Posted Mon May 25, 2020 09:23 AM

    I tried but apparently it didn't work.

    The current version is 2.10.150



    ------------------------------
    Fernando Dias
    ------------------------------



  • 4.  RE: Cplex 12:10 and Python

    Posted Tue June 21, 2022 09:21 AM
    HI, 

    I'm experiencing a similar problem. I have been using V12.9 with a Python v 3.7.3 and all worked well. I upgraded to 12.10 and I now get a similar error. 

    Is there are fix to this issue?

    Thanks

    Ashley

    ------------------------------
    Ashley Jones
    ------------------------------



  • 5.  RE: Cplex 12:10 and Python

    Community Leadership
    Posted Tue June 21, 2022 09:38 AM
    Edited by Xavier Nodet Tue June 21, 2022 09:40 AM
    When you updated from 12.9 to 12.10, what did you do related to the Python modules? 

    Did you run python [path-to-COS12.10-install]/python/setup.py install already?
    If doing so doesn't solve the issue, please let us know your Python version, and the versions of the cplex and docplex packages in your Python environment.

    ------------------------------
    Xavier
    ------------------------------