PyomoTools

PyomoTools is a collection of tools to aid in formulating and working with Pyomo models.

Key functions include:

• LoadIndexedSet: Create a dict of subsets and properly attach it to a given pyomo model. (available to environ models only)
• Load2DIndexedSet: Similar to LoadIndexedSet but with two levels of indexing. (available to environ models only)
• GenerateExpressionStrings: A function to create a matching pair of strings representing a given pyomo expression: One symbolic, One with all values substituted in
• InfeasibilityReport: A class to analyze any infeasibilities found within a model in an easily readable way.
• Formulations.DoubleSidedBigM: A function to automatically generate the constraints and variables needed to model the relation $A = B \times X + C$ in MILP form.
• Formulations.MinOperator: A function to automatically generate the constraints and variables needed to model the relation $A = min(B,C)$ in MILP form.
• Formulations.MaxOperator: A function to automatically generate the constraints and variables needed to model the relation $A = max(B,C)$ in MILP form.
• Formulations.PWL: A function to automatically generate a Piecewise-Linear approximation of a general (non-linear) function (available to environ models only) (pyomo kernel already has this functionality)
• IO.ModelToExcel: A function to write the solution of a model to an easily readable excel file. (available to environ models only)
• IO.LoadModelSolutionFromExcel: A function to load a solution from an excel file into a pyomo model. (available to environ models only)
• IO.ModelToYaml: A function to write the solution of a model to a yaml file. (available to kernel models only)
• IO.LoadSolutionFromYaml: A function to load a solution from a yaml file into a pyomo model. (available to kernel models only)
• FindLeastInfeasibleSolution: A tool for finding the least infeasible solution of a (presumably infeasible) model.
• VectorRepresentation: A tool to convert a (Mixed-Integer) Linear model into it's vector/matrix representation.
• Polytope: A class to facilitate the plotting and vertex calculation of a sub-polytope of a model.

Each function is available (or will soon be available) for both pyomo.environ modeling as well as pyomo.kernel modeling. To access each one, please import them from PyomoTools.environ or PyomoTools.kernel

Installation

From PyPi

1.1. Enter the command pip install PyomoTools in your Python terminal.

From GitHub

1.1. Download or clone this repository.
1.2. In your Python terminal, navigate to the repository you downloaded.
1.3. Enter the command pip install .

2. By default, the example/testing code used into this package uses the SCIP solver, Gurobi Solver, and ipopt Solver. Please either
   A) ensure that these solvers are installed and accessible to Pyomo or
   B) call PyomoTools.base.Solvers.DefaultSolver.EditDefaultSolver(problemType,solverName,**defaultKwargs) where
   problemType is MILP, NLP, MIQCP, etc,\ solverName is the name of the solver you'd like to use (e.g. "gurobi", "ipopt"), and\ defaultKwargs are any necessary key-word arguments for pyomo to utilize (e.g. executable=path/to/executable)

3. To make sure everything was correctly installed, Enter the command pytest PyomoTools/