cp_model_lns selecters and accepters

[C8504]

Inside cp_model_lns, I found it used UCB algorithm as generaters select criteria, while I didn't see which kind accept criterias when a lns subsolver found a new solution. For example, if the new solution is better, we will accept only or we also accept worse solution to avoid local optimal? Could you please advice where I could find details?
Thanks a lot.

[lperron]

There is a solution pool that contains sub-optimal solutions.
LNS selects solutions from that pool.

[C8504]

Thanks lperron, while how to select so many solutions, always select better?

[lperron]

so, pool size is 3 by default ( I believe, there is a parameter). And it picks randomly from that pool. Laurent Perron | Operations Research | ***@***.*** | (33) 1 42 68 53 00 Le dim. 4 févr. 2024 à 06:50, Jo ***@***.***> a écrit :

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Thanks lperron, while how to select so many solutions, always select better? — Reply to this email directly, view it on GitHub <#4076 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ACUPL3LJJUFT6GITQ26LSZ3YR4ORLAVCNFSM6AAAAABCYPTTTCVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4DGNJYG4ZDA> . You are receiving this because you modified the open/close state.Message ID: ***@***.***>

[C8504]

ok, thanks