[Bonmin] Feasibility in BONMIN
Novalio Daratha
novatha at gmail.com
Wed Jul 31 07:47:00 EDT 2013
Dear All,
I am trying to solve an MINLP using bonmin. It reported the MINLP as
infeasible problem while during the iterations I see some feasible
solutions. My question are:
1. why does bonmin conclude it as infeasible problem?
2. why not it gives the feasible solution even if it is not locally
optimal?
For your consideration, I put an example of bonmin output at the end of
this email. (bb_log_level 1).
I am thankful for your kind attention and help.
Sincerely Yours,
Novalio Daratha
PhD student
IIT Roorkee
India
Bonmin 1.5.2 using Cbc 2.7.6 and Ipopt 3.10.2
bonmin:
******************************************************************************
This program contains Ipopt, a library for large-scale nonlinear
optimization.
Ipopt is released as open source code under the Eclipse Public License
(EPL).
For more information visit http://projects.coin-or.org/Ipopt
******************************************************************************
NOTE: You are using Ipopt by default with the MUMPS linear solver.
Other linear solvers might be more efficient (see Ipopt
documentation).
NLP0012I
Num Status Obj It time
Location
NLP0014I 1 FAILED 0.0044821868 3000 8.388
NLP0014I 1 FAILED 0.0044678956 3000 7.652 resolve
robustness
NLP0014I 3 OPT 0.0041219542 1030 3.17
NLP0012I
Num Status Obj It time
Location
NLP0014I 1 INFEAS 1 54 0.144
NLP0014I 4 FAILED 1.2200549 3000 7.826
NLP0014I 5 FAILED 1.2400101 3000 8.146
NLP0014I 6 FAILED 1.2413622 3000 8.007
NLP0014I 7 FAILED 1.2398611 3000 7.769
NLP0014I 8 FAILED 0.03787479 3000 7.779
NLP0014I 9 FAILED -0.070294006 3000 7.33
NLP0014I 10 FAILED 0.0044563366 3000 7.775
NLP0014I 11 FAILED -0.070344772 3000 7.33
NLP0014I 12 FAILED 1.2242858 3000 7.964
NLP0014I 13 FAILED -0.070401127 3000 7.064
NLP0014I 14 FAILED 1.2470022 3000 7.639
NLP0014I 15 FAILED -0.070728211 3000 6.996
NLP0014I 16 OPT 0.0041219556 945 2.374
NLP0014I 17 FAILED -0.070781423 3000 6.949
NLP0014I 18 FAILED 0.0044845077 3000 7.292
NLP0014I 19 FAILED -0.069781992 3000 7.329
NLP0014I 20 FAILED 0.0045109264 3000 7.359
NLP0012I
Num Status Obj It time
Location
NLP0014I 21 FAILED -0.070408086 3000 7.094
NLP0014I 22 FAILED 0.0045273783 3000 7.419
NLP0014I 23 FAILED -0.070202589 3000 7.304
NLP0014I 24 FAILED 0.0054378863 3000 7.413
NLP0014I 25 FAILED -0.068064574 3000 7.261
NLP0014I 26 OPT 0.0041219556 6 0.012
NLP0014I 27 INFEAS 0.022268486 32 0.074
NLP0014I 28 OPT 0.0041219556 6 0.012
NLP0014I 29 FAILED 1.241151 3000 7.391
NLP0014I 30 FAILED 0.018211754 3000 7.548
NLP0014I 31 OPT 0.0041219556 803 1.956
NLP0014I 32 FAILED -0.15280958 3000 7.369
NLP0014I 33 OPT 0.0041219545 9 0.03
NLP0014I 34 FAILED -0.07020253 3000 7.219
NLP0014I 35 OPT 0.0041219549 7 0.022
NLP0014I 36 FAILED -0.069945526 3000 7.181
NLP0014I 37 OPT 0.0041219552 11 0.038
NLP0014I 38 FAILED -0.070313109 3000 7.356
NLP0014I 39 OPT 0.0041219556 14 0.031
NLP0014I 40 FAILED -0.070260101 3000 7.076
NLP0012I
Num Status Obj It time
Location
NLP0014I 41 OPT 0.0041219556 7 0.016
NLP0014I 42 FAILED -0.070746826 3000 7.126
NLP0014I 43 OPT 0.0041219556 6 0.013
NLP0014I 44 FAILED -0.070402666 3000 7.196
NLP0014I 45 OPT 0.0041219556 6 0.013
NLP0014I 46 FAILED -0.070522355 3000 7.377
NLP0014I 47 OPT 0.0041219556 6 0.013
NLP0014I 48 FAILED -0.069211894 3000 7.122
NLP0014I 49 OPT 0.0041219556 6 0.012
NLP0014I 50 FAILED -0.053808856 3000 6.91
NLP0014I 51 OPT 0.0041219556 6 0.013
NLP0014I 52 INFEAS 0.016728388 36 0.086
NLP0014I 53 OPT 0.0041219556 6 0.013
NLP0014I 54 FAILED 1.2291456 3000 7.679
NLP0014I 55 FAILED 0.0045429683 3000 7.632
NLP0014I 56 OPT 0.0041219556 6 0.013
NLP0014I 57 INFEAS 0.010787243 32 0.075
NLP0014I 58 OPT 0.0041219556 6 0.013
NLP0014I 59 FAILED 1.1645369 3000 8.174
NLP0014I 60 FAILED 0.0063708004 3000 7.581
NLP0012I
Num Status Obj It time
Location
NLP0014I 61 OPT 0.0041219492 20 0.062
NLP0014I 62 INFEAS 0.0046434659 38 0.089
NLP0014I 63 OPT 0.0041219492 20 0.063
NLP0014I 64 INFEAS 0.99998118 703 1.888
NLP0014I 65 FAILED 1.2612585 3000 8.095
NLP0014I 66 FAILED 1.2456221 3000 7.746
Cbc0001I Search completed - best objective 1e+050, took 3038 iterations and
0 nodes (299.17 seconds)
Cbc0032I Strong branching done 29 times (116699 iterations), fathomed 0
nodes and fixed 5 variables
Cbc0035I Maximum depth 0, 0 variables fixed on reduced cost
NLP0014I 67 FAILED -0.14257739 3000 7.17
"Finished"
bonmin: Infeasible problem
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