[Bonmin-tickets] [Bonmin] #23: Bonmin stops because Ipopt couldn't solve an NLP

[Bonmin]

#23: Bonmin stops because Ipopt couldn't solve an NLP
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Reporter:  stefan        |       Owner:  pbonami
    Type:  enhancement   |      Status:  new    
Priority:  major         |   Component:  Bonmin 
 Version:  branches/0.9  |    Keywords:         
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 Hi,

 from time to time, Bonmin stops with a message from Ipopt like
 {{{
 Restoration phase is called at point that is almost feasible,
   with constraint violation 1.148614e-16. Abort.
 }}}
 and throws a TNLPSolver::!UnsolvedError exception.

 Can this be relaxed in some way, e.g., by just letting Bonmin drop the
 current node and continue with another one (if any)? Alternatively, it
 could just keep the previous lower bound, do a branching on the node, and
 hope that it is getting better with the children.[[BR]]
 (These are the two options SBB offer for such a case.)

 Best,
 Stefan

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Ticket URL: <https://projects.coin-or.org/Bonmin/ticket/23>
Bonmin <http://projects.coin-or.org/Bonmin>
Basic Open-source Nonlinear Mixed INteger programming