[Couenne] Error with CouenneRecordBestSol

[Pietro Belotti]

Hi Christian,

I haven't seen this happen in Couenne before, though I don't use Pyomo very
often. Can you share the model that yields this error?

Also, there might be a .sol file containing the solution in case that's all
you want. This file can be either in /tmp or in the directory where the
program was started. The solution file format is relatively easy: After a
preamble with unused parameter, look for two lines with the same number,
say k, that is the number of variables of the original problem. The
following k lines are an optimal solution as found by Couenne.

Regards,
Pietro

On Tue, May 3, 2016 at 10:30 AM, "Christian Schröder" <
Chris.Schroed1991 at web.de> wrote:

> Hello,
>
> i tried to solve a model with Couenne using Pyomo for modeling and got an
> error message i dont understand.
> Couenne finds a integer solution and finishes optimal. Still the last line
> from the output says:
>
> CoenneRecordBestSol::getModSol(): ###ERROR: expectedCard: -1 cardModSol:
> 121
>
> Could you help me out?
>
> Regards,
> Christian
>
>
> complete output:
> ####################################################
> !pyomo solve --solver=couenne model_1.py
> [    0.00] Setting up Pyomo environment
> [    0.00] Applying Pyomo preprocessing actions
> [    0.01] Creating model
> [    0.03] Applying solver
> ERROR: "[base]\pyomo-4.3.11329-py2.7.egg\pyomo\opt\base\solvers.py", 570,
> solve
>         Solver (asl) returned non-zero return code (1)
> ERROR: "[base]\pyomo-4.3.11329-py2.7.egg\pyomo\opt\base\solvers.py", 575,
> solve
>         Solver log:
>         Couenne 0.4.7 --  an Open-Source solver for Mixed Integer
> Nonlinear Optimization
>         Mailing list: couenne at list.coin-or.org
>         Instructions: http://www.coin-or.org/Couenne
>
>         NLP0012I
>                       Num      Status      Obj             It       time
>               Location
>         NLP0014I             1         OPT 1.1975299      124 0.231
>         Coin0506I Presolve 126 (-32) rows, 74 (-47) columns and 350 (-79)
> elements
>         Clp0006I 0  Obj 1.92 Primal inf 369.47823 (20) Dual inf 26.380188
> (2)
>         Clp0006I 38  Obj 0.96
>         Clp0000I Optimal - objective value 0.96
>         Clp0032I Optimal objective 0.96 - 38 iterations time 0.002,
> Presolve 0.00
>         Clp0000I Optimal - objective value 0.96
>         NLP0014I             2      INFEAS 0.017486949       34 0.055
>         Clp0000I Optimal - objective value 0.96
>         Cbc0031I 4 added rows had average density of 2.5
>         Cbc0013I At root node, 4 cuts changed objective from 0.96 to
> 0.96328023 in 4 passes
>         Cbc0014I Cut generator 0 (Couenne convexifier cuts) - 12 row cuts
> average 2.6 elements, 2 column cuts (6 active)
>         Cbc0010I After 0 nodes, 0 on tree, 1e+050 best solution, best
> possible 0.96328023 (0.32 seconds)
>         Cbc0010I After 100 nodes, 44 on tree, 1e+050 best solution, best
> possible 1.2 (2.32 seconds)
>         Cbc0004I Integer solution of 1.8970508 found after 974 iterations
> and 115 nodes (2.35 seconds)
>         Cbc0010I After 200 nodes, 54 on tree, 1.8970508 best solution,
> best possible 1.2 (2.82 seconds)
>         Cbc0010I After 300 nodes, 86 on tree, 1.8970508 best solution,
> best possible 1.2 (3.18 seconds)
>         Cbc0010I After 400 nodes, 130 on tree, 1.8970508 best solution,
> best possible 1.2 (3.38 seconds)
>         Cbc0004I Integer solution of 1.44 found after 3500 iterations and
> 468 nodes (3.52 seconds)
>         Cbc0010I After 500 nodes, 57 on tree, 1.44 best solution, best
> possible 1.2261503 (3.57 seconds)
>         Cbc0010I After 600 nodes, 54 on tree, 1.44 best solution, best
> possible 1.2355182 (3.81 seconds)
>         Cbc0010I After 700 nodes, 20 on tree, 1.44 best solution, best
> possible 1.2636993 (3.96 seconds)
>         Cbc0010I After 800 nodes, 1 on tree, 1.44 best solution, best
> possible 1.4379178 (4.24 seconds)
>         Cbc0001I Search completed - best objective 1.44, took 5821
> iterations and 802 nodes (4.24 seconds)
>         Cbc0035I Maximum depth 57, 5 variables fixed on reduced cost
>
>         couenne: Optimal
>
>                 "Finished"
>         CouenneRecordBestSol::getModSol(): ### ERROR: expectedCard: -1
>  cardModSol: 121
> [    4.57] Pyomo Finished
> ERROR: Unexpected exception while running model:
>         Solver (asl) did not exit normally
>
>
>
>
>
>
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