Thread 'main' panicked - intermittent error

[leobudima]

Hi - thanks one more time for an amazing solution!

I thought it might be useful to report an issue that happens intermittently, and I am unfortunately not able to reproduce it consistently. It happens with different datasets / parameters, and if I run the exact same optimization after the panic, it works fine.

Hopefully, at least the position will help ascertain the possible cause.

thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', vrp-core/src/solver/heuristic.rs:188:103

If I can do anything else to help pinpoint the issue, happy to do so!

Kind regards!

[reinterpretcat]

Hi, thanks for feedback!

Looks like an interesting issue, never seen it so far. Seems some solutions are added to the population in an invalid state: either init_weights is not called (https://github.com/reinterpretcat/vrp/blob/master/vrp-core/src/solver/heuristic.rs#L167) or solution state is cleaned without recalculating weights, but why it is not happening consistently?.. Need to think a bit.

Can you try to reproduce it in debug build and give me a full call stack when it crashes? Also do you use some specific features when the issue is reproduced?