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Require a callable as the internal solver

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Alinson S. Xavier
2021-01-19 21:21:39 -06:00
parent 3ff773402d
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docs/customization.md
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### Selecting the internal MIP solver
By default, `LearningSolver` uses [Gurobi](https://www.gurobi.com/) as its internal MIP solver. Another supported solver is [IBM ILOG CPLEX](https://www.ibm.com/products/ilog-cplex-optimization-studio). To switch between solvers, use the `solver` constructor argument, as shown below. It is also possible to specify a time limit (in seconds) and a relative MIP gap tolerance.
By default, `LearningSolver` uses [Gurobi](https://www.gurobi.com/) as its internal MIP solver, and expects models to be provided using the Pyomo modeling language. Other supported solvers and modeling languages include:
* `CplexPyomoSolver`: [IBM ILOG CPLEX](https://www.ibm.com/products/ilog-cplex-optimization-studio) with Pyomo.
* `GurobiSolver`: Gurobi without any modeling language.
To switch between solvers, provide the desired class using the `solver` argument:
```python
from miplearn import LearningSolver
solver = LearningSolver(solver="cplex",
time_limit=300,
gap_tolerance=1e-3)
from miplearn import LearningSolver, CplexPyomoSolver
solver = LearningSolver(solver=CplexPyomoSolver)
```
## Customizing solver components