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Questions - constraint-programming

OptaPlanner ignoring constraint

I created a timeToIdealDate constraint in VehicleRoutingConstraintProvider. The goal of this constraint is to group visits to vehicles with the visit's idealDate being closest to the vehicle's start ...
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Patrick Nomad

java

optaplanner

constraint-programming

Votes: 0

Answers: 1

Latest Answer

The timeToIdealDate constraint looks right, even though it can be simplified by removing the groupBy() and passing the PlanningVisit::absoluteDistanceToIdealDate directly to the penalizeLong(): Constr...
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Radovan Synek

Choco-Solver: Is there a way to know how many times a constraint is broken during the solving process?

My models is inefficient and taking too long to find valid solutions so I think knowing how many times the constraints are being broken would be useful for testing. Thank you
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Eloy

java

constraints

constraint-programming

choco

Votes: 0

Answers: 1

Latest Answer

Since Choco-solver-4.10.8, it is possible to have insights on the propagation. //... Solver s = m.getSolver(); PropagationProfiler profiler = s.profilePropagation(); s.findSolution(); profiler.writeTo...
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cprudhom

Or-tools CP-SAT solver: How can i ensure a mandatory 3 shift break?

I am fairly new to the topic but I have started to implement a shift scheduler using this example: https://developers.google.com/optimization/scheduling/employee_scheduling Now I want to add the follo...
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Henrike

python

or-tools

constraint-programming

cp-sat-solver

Votes: 0

Answers: 0

Minimizing L1 distances using ortools

I'm trying to place rectangular boxes into a larger box. Some of these boxes are connected by wires. I want to minimize the L1 distance of these wires. This requires taking the absolute value of varia...
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Björn Lindqvist

python

or-tools

constraint-programming

absolute-value

Votes: 0

Answers: 1

Latest Answer

use model.AddAbsEquality(target_var, var) See https://google.github.io/or-tools/python/ortools/sat/python/cp_model.html#CpModel.AddAbsEquality Used here: https://github.com/google/or-tools/blob/stable...
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Laurent Perron

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