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Finally, we validate the accuracy of our GA on small instances that have been solved to optimality using GAMS.
As mentioned before, the second stage can be formulated as a TSP problem such that a generally good solvability, especially on small instances can be claimed.
Results are compared to those obtained by a direct resolution of the mixed integer program (on small instances) or by the classical NSGA-II metaheuristic (on larger instances).
We test our heuristic algorithm on instances taken from literature and on small instances generated similar to that of Cordeau's benchmark instances and validate our solution approach against the optimal solutions obtained through the exact method before implementing it on food rescue and delivery network.
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On the other hand, there are known classes of small instances for which current SAT solvers fail.
Standard (per instance hour consumed) €0.085 for small instances €0.34 for large instances €0.68 for x-large instances.
Although the good human performance on the TSP has been known for long a time [25], recent studies have shown that this performance is very close to optimal and is competitive with heuristics on relatively small instances [26] [36].
The results are presented based on the VMs sizes: Small instances (Fig. 36), Medium instances (Fig. 37), Large instances (Fig. 38), and Xlarge instances (Fig. 39).
Passengers might be allowed, for instance, to carry on small bottles of perfume or perhaps other substances that pose little security threat because of their size.
CFB-EA, specially designed to handle constrained problems, is compared with an exact branch and bound approach on small problem instances and with another evolutionary approach carefully selected for larger instances.
For example, an on-demand EC2 Small instance costs $0.10 per hour.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com