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I am solving the CVRP with Adaptive Large Neighborhood Search (ALNS) .

I used the following construction operators: GreedyInsertion and regretHeuristique, and the following destruction operators: relaxShawDeletion , RoutePortionOperator, and LongestDetourOperator.

But the solutions I get are very far from the solutions that are in the literature.

Do you have an idea on how I can improve the solution? Are there any other operators that give better solutions?

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  • $\begingroup$ Are you trying to implement the exact same algorithm as one from the literature? Here is a recent LNS algorithm for the CVRP, you might find some inspiration doi.org/10.1287/trsc.2019.0914 $\endgroup$
    – fontanf
    Commented Mar 1, 2021 at 19:55

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We encourage you to look at the code of jsprit, the open-source Java vehicle routing library. The jsprit approach is based on a "ruin & recreate" heuristic, also known as Adaptive Large Neighborhood Search (ALNS). The operators can be found here in the folders "ruin" and "recreate" respectively.

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