[Ipopt] Question on 'user requested stop'

[Stefan Vigerske]

You should check that you return true from the intermediate_callback.
If that returns false, then Ipopt will stop with this status.

On 08/03/2016 04:40 PM, Victor Fachinotti wrote:
> Dear developers,
>
>
>
> I am trying to solve a constrained NLP, where the starting point x0
> satisfies all the constraints but it is far to be an optimum.
>
>
>
> I have set options.ipopt to the default values, except for
> options.ipopt.hessian_approximation = 'limited-memory'.
>
>
>
> IPOPT exits without modifying x0 with info.status=5 (user requested stop).
>
>
>
> I would appreciate your help to understand why this happens.
>
>
>
> Yours,
>
>
>
>
>
> Prof. Dr. Víctor D. Fachinotti
>
> Centro de Investigación de Métodos Computacionales (CIMEC)
>
> Universidad Nacional del Litoral (UNL)
>
> Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
>
> Predio CONICET “Dr. Alberto Cassano”
>
> Colectora Ruta Nac. 168 s/n, Paraje El Pozo
>
> 3000, Santa Fe, Argentina
>
> Tel: +54 342 4511594 x 7045
>
> Fax: +54 342 4511169
>
>
>
>
>
> PS: These are the messages I got:
>
> %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
>
>
>
> This is Ipopt version 3.11.8, running with linear solver ma57.
>
>
>
> Number of nonzeros in equality constraint Jacobian...:     9701
>
> Number of nonzeros in inequality constraint Jacobian.:     3200
>
> Number of nonzeros in Lagrangian Hessian.............:        0
>
>
>
> Reallocating memory for MA57: lfact (155793)
>
> Reallocating memory for MA57: lfact (324812)
>
> Reallocating memory for MA57: lfact (493001)
>
> Reallocating memory for MA57: lfact (681090)
>
> Reallocating memory for MA57: lfact (2385003)
>
> Reallocating memory for MA57: lfact (3591894)
>
> Reallocating memory for MA57: lfact (7330350)
>
> Reallocating memory for MA57: lfact (8969064)
>
> Total number of variables............................:     6518
>
>                      variables with only lower bounds:        0
>
>                 variables with lower and upper bounds:     6518
>
>                      variables with only upper bounds:        0
>
> Total number of equality constraints.................:     3318
>
> Total number of inequality constraints...............:        1
>
>         inequality constraints with only lower bounds:        0
>
>    inequality constraints with lower and upper bounds:        0
>
>         inequality constraints with only upper bounds:        1
>
>
>
> iter    objective    inf_pr   inf_du lg(mu)  ||d||  lg(rg) alpha_du alpha_pr
> ls
>
>    0 8.2501468e-002 5.41e-013 1.00e+000   0.0 0.00e+000    -  0.00e+000
> 0.00e+000   0
>
>
>
> Number of Iterations....: 0
>
>
>
>                                    (scaled)                 (unscaled)
>
> Objective...............:  8.2501467997805847e-002   8.2501467997805847e-002
>
> Dual infeasibility......:  1.0000000000000000e+000   1.0000000000000000e+000
>
> Constraint violation....:  5.4107912499765483e-013   5.4107912499765483e-013
>
> Complementarity.........:  1.8929389054602732e+000   1.8929389054602732e+000
>
> Overall NLP error.......:  1.8929389054602732e+000   1.8929389054602732e+000
>
>
>
>
>
> Number of objective function evaluations             = 1
>
> Number of objective gradient evaluations             = 1
>
> Number of equality constraint evaluations            = 1
>
> Number of inequality constraint evaluations          = 1
>
> Number of equality constraint Jacobian evaluations   = 1
>
> Number of inequality constraint Jacobian evaluations = 1
>
> Number of Lagrangian Hessian evaluations             = 0
>
> Total CPU secs in IPOPT (w/o function evaluations)   =      0.493
>
> Total CPU secs in NLP function evaluations           =      0.010
>
>
>
> EXIT: Stopping optimization at current point as requested by user.
>
>
>
>
>
>
>
>
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>


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