Practical Python AI Projects – Book [PDF]

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Practical Python AI Projects – Book

Let me stress that, contrary to TSP, where the subtour elimination constraints are required for the model to be valid, the constraints we are adding here are not required; they simply are added to nudge the solver in the right direction and accelerate the solution process. Therefore, some solvers will help tremendously.

For others they will be useless; they might actually slow the whole process down. Without deep knowledge of the internal workings of a particular solver, the effect on runtime is nearly impossible to predict.12 The point is that once a modeler is aware of this technique of relaxation tightening, he may easily try it on a particular combination of model-solver that is proving recalcitrant.