Gwyneth Butera
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Gurobi Staff
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Articles
Recent activity by Gwyneth Butera-
How do I use the Gurobi Command Line Interface (gurobi_cl)?
The Gurobi Command Line Interface plays a number of different roles. It: provides a simple interface for solving a model, can also be used to launch a model on a Compute Server or Gurobi Instant Cl...
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How do I resolve the error 'Constraint has no bool value (are you trying "lb <= expr <= ub"?)'?
There are three primary causes of this error: Trying to add a two-sided constraint Using NumPy scalars on the left-hand side of a constraint Using variables or expressions in if-clauses Trying to a...
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How do I resolve the error "KeyError: 'Missing constraint index'"?
The error message "KeyError: 'Missing constraint index'" appears when you try to add a single constraint using the method Model.addConstrs(). This is used for adding multiple constraints to a model...
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How do I set up a Web License Service (WLS) license?
Web License Service (WLS) licenses allow you to run Gurobi from any internet-connected Windows, Linux, or macOS device. They may be configured to work in containers, outside of containers (in a phy...
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When is distributed optimization useful?
Why Distributed Optimization?Distributed Optimization can be used for: Distributed Concurrent: You can use multiple machines to solve an LP or MIP model. Each machine uses a different strategy to ...
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How do I set up and use a floating token server license?
When using a floating token server license, a program that calls Gurobi Optimizer must obtain a token from a Gurobi token server before it can solve an optimization model.Note: If you are setting u...
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How do I resolve the error "error while loading shared libraries"?
When you run a program that uses Gurobi on some SELinux systems, you may run into the following error message:error while loading shared libraries: libgurobi120.so:cannot restore segment prot after...
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How do I play the Burrito Optimization Game?
The Burrito Optimization Game is a web application that is intended to act as an entry point for data scientists and problem solvers who could benefit from optimization. This game teaches players ...
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How do I use gurobipy on Apple Silicon and Monterey (macOS 12)?
On macOS Monterey (macOS 12), the default python3 (/usr/bin/python3) is version 3.8.However, Gurobi v9.1 and later only support arm64 for Python >= 3.9.If you are on a machine with an Apple Silicon...
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How do I resolve the error "Model is infeasible or unbounded"?
Sometimes, an optimization returns the Optimization Status Code INF_OR_UNBD or the message "Model is infeasible or unbounded". This may occur because there are some steps in presolve that prevent u...