SolveFromAssignmentsWithParameters returns nullptr even though valid initial Asignment given

[Nano Byte]

Hello all,

I do have a general question and or bug. I am unsure about the intended behavior.

Provided a valid Assignment* that is successfully evaluated by the RoutingModel,

calling SolveFromAssignmentsWithParameters() with this Assignment (sometimes) yields a nullptr.

With the Debugger I looked into the RoutingModel and saw that assignment_ is indeed set internally with legal objective bounds.

But collect_assignments_ is empty.

It ultimately runs into status_ = ROUTING_FAIL clause.

My Question:

- Is this a Bug?

- Should the initial solution always be part of the collect_assignemts_ or not?

Thanks and Kind Regards
_nano_

[Vincent Furnon]

Did you set a time limit ?

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[Nano Byte]

Indeed I did. But it is not a ROUTING_FAIL_TIMEOUT, but ROUTING_FAIL.

Due to the model complexity I see that it my struggle to find a DIFFERNET solution in time. But the time is for sure sufficient to evaluate the given initial solution.